- URL: https://volbeatz.nl
- Date: 12/12/24 14:38:40
Webpage Performance Test Result
- Settings: Desktop
v129
Cable
Frankfurt, GermanyMore
- Test runs: 1
- Connectivity: 5000/1000 Kbps, 28ms Latency
- Custom Metrics
View:
Lighthouse Report
Lighthouse is an open-source, automated tool for improving the quality of web pages. You can run it against any web page, public or requiring authentication. Overall scoring color key: (0-49 50-89 90-100).
For scripted tests, Lighthouse report will only be available on the final step.
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Performance 68
Lighthouse Metrics
Values are estimated and may vary.
The performance score is calculated directly from these metrics. See calculator.
| First Contentful Paint | Speed Index | Largest Contentful Paint | Time to Interactive | Total Blocking Time | Cumulative Layout Shift |
|---|---|---|---|---|---|
| 0.5s | 1.5s | 2.2s | 5.1s | 430ms | 0.038 |
Aiming to improve? check out our Opportunities & Experiments for suggestions and run No-Code Experiments to see how changes impact this site!
Filmstrip
Opportunities (8)
-
Serve images in next-gen formats
Estimated savings 1.71 s
Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. Learn more about modern image formats.
URL Resource Size (bytes) Potential Savings (bytes) https://volbeatz.nl/assets/images/band.png 980333 909099 https://volbeatz.nl/media/pages/home/Volbeatz_Gigs.png 653365 582649 https://volbeatz.nl/assets/images/dark_leather.png 74431 60158 https://volbeatz.nl/assets/images/tirr-logo.png 60260 49814 https://live.staticflickr.com/65535/53049745839_6917f9d87c_z.jpg 84557 45863 https://i.ytimg.com/vi/Vd7U5LfdHfQ/sddefault.jpg?sqp=-oaymwEmCIAFEOAD8quKqQMa8AEB-AH-CYAC0AWKAgwIABABGF4gFih_MA8=&rs=AOn4CLCoD5pXiGpFxZUnGdV-ufqvCgYTew 25259 8782 Properly size images
Estimated savings 0.56 s
Serve images that are appropriately-sized to save cellular data and improve load time. Learn how to size images.
URL Resource Size (bytes) Potential Savings (bytes) https://volbeatz.nl/media/pages/home/Volbeatz_Gigs.png 653365 486413 https://volbeatz.nl/assets/images/tirr-logo.png 60260 47339 Defer offscreen images
View Experiment!Estimated savings 0.18 s
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. Learn how to defer offscreen images.
URL Resource Size (bytes) Potential Savings (bytes) https://live.staticflickr.com/65535/53049745839_6917f9d87c_z.jpg 84557 84557 https://volbeatz.nl/assets/images/tirr-logo.png 60260 60260 Reduce unused JavaScript
Estimated savings 0.09 s
Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.
URL Transfer Size (bytes) Potential Savings (bytes) https://www.googletagmanager.com/gtag/js?id=G-FBY6TVT3YH&cx=c&_slc=1 98303 41132 https://www.youtube.com/s/player/5b77d519/player_ias.vflset/en_US/remote.js 34850 26894 https://www.youtube.com/s/player/5b77d519/player_ias.vflset/en_US/remote.js 34850 26846 Efficiently encode images
Estimated savings 0.04 s
Optimized images load faster and consume less cellular data. Learn how to efficiently encode images.
URL Resource Size (bytes) Potential Savings (bytes) https://live.staticflickr.com/65535/53049745839_6917f9d87c_z.jpg 84557 4683 Initial server response time was short
Root document took 60 ms
Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.
URL Time Spent (ms) https://volbeatz.nl/ 64 Enable text compression
Potential savings of 8 KiB
Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes. Learn more about text compression.
URL Transfer Size (bytes) Potential Savings (bytes) https://widgets.flickr.com/embedr/embedr-47ad26da5deade67d472950b12c94b6c.js 11335 7747 Preload Largest Contentful Paint image
View Experiment!If the LCP element is dynamically added to the page, you should preload the image in order to improve LCP. Learn more about preloading LCP elements.
URL Potential Savings (ms) https://volbeatz.nl/assets/images/band.png 0 Diagnostics (16)
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Some third-party resources can be lazy loaded with a facade
1 facade alternative available
Some third-party embeds can be lazy loaded. Consider replacing them with a facade until they are required. Learn how to defer third-parties with a facade.
Product Transfer Size (bytes) Main-Thread Blocking Time YouTube Embedded Player (Video) 1031160 224 URL Transfer Size Blocking Time https://www.youtube.com/s/player/5b77d519/player_ias.vflset/en_US/base.js 649974 79 https://www.youtube.com/s/player/5b77d519/www-embed-player.vflset/www-embed-player.js 100519 146 https://www.youtube.com/embed/Ey4Y4u6EQ9w 83888 0 https://www.youtube.com/s/player/5b77d519/www-player.css 50379 0 https://www.youtube.com/embed/Vd7U5LfdHfQ 41609 0 Other resources 104791 0 Largest Contentful Paint element
2,250 ms
This is the largest contentful element painted within the viewport. Learn more about the Largest Contentful Paint element
Page prevented back/forward cache restoration
1 failure reason
Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache
Failure reason Failure type Internal error. Not actionable Frame Url https://www.youtube.com/embed/Ey4Y4u6EQ9w Avoid chaining critical requests
13 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load. Learn how to avoid chaining critical requests.
-
https://volbeatz.nl/
6kb
- https://volbeatz.nl/assets/css/styles.css 3kb
- https://use.typekit.net/af/dcb520/000000000000000000010af8/23/l?subset_id=2&fvd=n4&v=3 16kb
- https://use.typekit.net/af/6d06d1/00000000000000000001262c/23/l?subset_id=2&fvd=n4&v=3 16kb
- https://use.typekit.net/af/174bd3/00000000000000000001262d/23/l?subset_id=2&fvd=i4&v=3 14kb
- https://use.typekit.net/af/635030/000000000000000000012630/23/l?subset_id=2&fvd=n7&v=3 15kb
- https://use.typekit.net/af/317a52/000000000000000000012631/23/l?subset_id=2&fvd=i7&v=3 16kb
- https://use.typekit.net/af/e66eae/000000000000000000010d5c/23/l?subset_id=2&fvd=n4&v=3 20kb
- https://use.typekit.net/af/d3f862/000000000000000000011966/23/l?subset_id=2&fvd=n4&v=3 20kb
- https://volbeatz.nl/assets/js/modernizr.js 6kb
- https://use.typekit.net/gpa3xxw.js 7kb
- https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js 33kb
- https://volbeatz.nl/assets/js/responsiveslides.min.js 2kb
- https://volbeatz.nl/assets/js/script.js 3kb
Ensure text remains visible during webfont load
View Experiment!Leverage the
font-displayCSS feature to ensure text is user-visible while webfonts are loading. Learn more aboutfont-display.URL Potential Savings https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxK.woff2 480 https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4.woff2 483 https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxK.woff2 162 https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4.woff2 160 https://use.typekit.net/af/dcb520/000000000000000000010af8/23/l?subset_id=2&fvd=n4&v=3 1003 https://use.typekit.net/af/6d06d1/00000000000000000001262c/23/l?subset_id=2&fvd=n4&v=3 1033 https://use.typekit.net/af/174bd3/00000000000000000001262d/23/l?subset_id=2&fvd=i4&v=3 1010 https://use.typekit.net/af/635030/000000000000000000012630/23/l?subset_id=2&fvd=n7&v=3 1042 https://use.typekit.net/af/317a52/000000000000000000012631/23/l?subset_id=2&fvd=i7&v=3 790 https://use.typekit.net/af/e66eae/000000000000000000010d5c/23/l?subset_id=2&fvd=n4&v=3 761 https://use.typekit.net/af/d3f862/000000000000000000011966/23/l?subset_id=2&fvd=n4&v=3 837 https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxK.woff2 63 https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4.woff2 56 https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxK.woff2 19 https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4.woff2 56 Avoid enormous network payloads
View Experiment!Total size was 3,299 KiB
Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.
URL Transfer Size (bytes) https://volbeatz.nl/assets/images/band.png 981114 https://volbeatz.nl/media/pages/home/Volbeatz_Gigs.png 653966 https://www.youtube.com/s/player/5b77d519/player_ias.vflset/en_US/base.js 649974 https://www.youtube.com/s/player/5b77d519/www-embed-player.vflset/www-embed-player.js 100519 https://www.googletagmanager.com/gtag/js?id=G-FBY6TVT3YH&cx=c&_slc=1 98887 https://live.staticflickr.com/65535/53049745839_6917f9d87c_z.jpg 85554 https://volbeatz.nl/assets/images/dark_leather.png 74716 https://volbeatz.nl/assets/images/tirr-logo.png 60535 https://www.youtube.com/s/player/5b77d519/www-player.css 50379 https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/Create 43134 Avoid long main-thread tasks
8 long tasks found
Lists the longest tasks on the main thread, useful for identifying worst contributors to input delay. Learn how to avoid long main-thread tasks
URL Start Time Duration https://www.youtube.com/s/player/5b77d519/player_ias.vflset/en_US/base.js 4956 166 https://www.youtube.com/s/player/5b77d519/player_ias.vflset/en_US/base.js 4819 128 https://www.youtube.com/s/player/5b77d519/player_ias.vflset/en_US/base.js 4697 115 https://www.youtube.com/s/player/5b77d519/player_ias.vflset/en_US/base.js 4573 114 https://www.youtube.com/s/player/5b77d519/www-embed-player.vflset/www-embed-player.js 4362 111 https://volbeatz.nl/ 333 91 https://www.youtube.com/s/player/5b77d519/www-embed-player.vflset/www-embed-player.js 4247 86 https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js 1273 61 Minimize third-party usage
Third-party code blocked the main thread for 220 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading. Learn how to minimize third-party impact.
Third-Party Transfer Size (bytes) Main-Thread Blocking Time YouTube 1031160 224 URL Transfer Size Blocking Time https://www.youtube.com/s/player/5b77d519/www-embed-player.vflset/www-embed-player.js 100519 146 https://www.youtube.com/s/player/5b77d519/player_ias.vflset/en_US/base.js 649974 79 https://www.youtube.com/embed/Ey4Y4u6EQ9w 83888 0 https://www.youtube.com/s/player/5b77d519/www-player.css 50379 0 https://www.youtube.com/embed/Vd7U5LfdHfQ 41609 0 https://www.youtube.com/s/player/5b77d519/player_ias.vflset/en_US/remote.js 34927 0 https://i.ytimg.com/vi/Vd7U5LfdHfQ/sddefault.jpg?sqp=-oaymwEmCIAFEOAD8quKqQMa8AEB-AH-CYAC0AWKAgwIABABGF4gFih_MA8=&rs=AOn4CLCoD5pXiGpFxZUnGdV-ufqvCgYTew 25675 0 https://www.youtube.com/s/player/5b77d519/player_ias.vflset/en_US/embed.js 20967 0 https://i.ytimg.com/vi/Ey4Y4u6EQ9w/sddefault.jpg?sqp=-oaymwEmCIAFEOAD8quKqQMa8AEB-AH-CYAC0AWKAgwIABABGGUgYChBMA8=&rs=AOn4CLCafoPZ1Nij_6_ht4sJlKMh9TdR_A 20053 0 https://yt3.ggpht.com/ytc/AIdro_mWqMJaBGTlJWspTQ3AyTqyfSW6cx_g_EIuRo3mgK17Bw=s68-c-k-c0x00ffffff-no-rj 2815 0 https://www.youtube.com/youtubei/v1/log_event?alt=json 278 0 https://www.youtube.com/generate_204?ZgPKVg 39 0 https://www.youtube.com/generate_204?EjMRgQ 37 0 Adobe TypeKit 127862 0 URL Transfer Size Blocking Time https://use.typekit.net/af/d3f862/000000000000000000011966/23/l?subset_id=2&fvd=n4&v=3 20919 0 https://use.typekit.net/af/e66eae/000000000000000000010d5c/23/l?subset_id=2&fvd=n4&v=3 20659 0 https://use.typekit.net/af/6d06d1/00000000000000000001262c/23/l?subset_id=2&fvd=n4&v=3 16882 0 https://use.typekit.net/af/dcb520/000000000000000000010af8/23/l?subset_id=2&fvd=n4&v=3 16061 0 https://use.typekit.net/af/317a52/000000000000000000012631/23/l?subset_id=2&fvd=i7&v=3 15886 0 https://use.typekit.net/af/635030/000000000000000000012630/23/l?subset_id=2&fvd=n7&v=3 15378 0 https://use.typekit.net/af/174bd3/00000000000000000001262d/23/l?subset_id=2&fvd=i4&v=3 14790 0 https://use.typekit.net/gpa3xxw.js 7082 0 https://p.typekit.net/p.gif?s=1&k=gpa3xxw&ht=tk&h=volbeatz.nl&f=38.1717.1718.1719.1720.10327.14011&a=26613&js=1.21.0&app=typekit&e=js&_=1734014283348 205 0 Other Google APIs/SDKs 110187 0 URL Transfer Size Blocking Time https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/Create 85926 0 https://www.google.com/js/th/ga5zxKXcpt3UeeH3-hk2EUAajHTFNllVLrJAQ_s-Fqc.js 21123 0 https://play.google.com/log?format=json&hasfast=true&authuser=0 2773 0 https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT 365 0 Google Tag Manager 98887 0 URL Transfer Size Blocking Time https://www.googletagmanager.com/gtag/js?id=G-FBY6TVT3YH&cx=c&_slc=1 98887 0 Flickr 98600 0 URL Transfer Size Blocking Time https://live.staticflickr.com/65535/53049745839_6917f9d87c_z.jpg 85554 0 https://widgets.flickr.com/embedr/embedr-47ad26da5deade67d472950b12c94b6c.js 11756 0 https://embedr.flickr.com/assets/client-code.js 855 0 https://embedr.flickr.com/assets/embedr-loader.js 435 0 Google CDN 51564 0 URL Transfer Size Blocking Time https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js 34103 0 https://www.gstatic.com/eureka/clank/129/cast_sender.js 14971 0 https://www.gstatic.com/cv/js/sender/v1/cast_sender.js 2490 0 Google Fonts 30950 0 URL Transfer Size Blocking Time https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4.woff2 15579 0 https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxK.woff2 15371 0 Google Analytics 23239 0 URL Transfer Size Blocking Time https://www.google-analytics.com/analytics.js 21563 0 https://www.google-analytics.com/plugins/ua/linkid.js 989 0 https://www.google-analytics.com/j/collect?v=1&_v=j101&a=1800539696&t=pageview&_s=1&dl=https%3A%2F%2Fvolbeatz.nl%2F&ul=en-us&de=UTF-8&dt=Volbeatz%2C%20Volbeat%20tribute%20band&sd=24-bit&sr=800x600&vp=1905x993&je=0&_u=KGBAAEAjAAAAACAAI~&jid=1388249258&gjid=1266708708&cid=355834950.1734014283&tid=UA-57788311-1&_gid=1712377354.1734014283&_r=1&_slc=1&z=1916378585 430 0 https://www.google-analytics.com/g/collect?v=2&tid=G-FBY6TVT3YH>m=45je4cb0v9106345734za200&_p=1734014283540&gcd=13l3l3l3l2l1&npa=0&dma=0&tag_exp=101925629~102067555~102067808~102081485&ul=en-us&sr=800x600&cid=355834950.1734014283&ir=1&uaa=x86&uab=64&uafvl=Google%2520Chrome%3B129.0.6668.100%7CNot%253DA%253FBrand%3B8.0.0.0%7CChromium%3B129.0.6668.100&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&are=1&frm=0&pscdl=noapi&_eu=EBAI&_s=1&dl=https%3A%2F%2Fvolbeatz.nl%2F&dt=Volbeatz%2C%20Volbeat%20tribute%20band&sid=1734014283&sct=1&seg=0&en=page_view&_fv=1&_ss=1&_ee=1&tfd=2827 257 0 Google/Doubleclick Ads 784 0 URL Transfer Size Blocking Time https://static.doubleclick.net/instream/ad_status.js 446 0 https://googleads.g.doubleclick.net/pagead/id?slf_rd=1 292 0 https://googleads.g.doubleclick.net/pagead/id 46 0 JavaScript execution time
1.0 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.
URL Total CPU Time Script Evaluation Script Parse https://www.youtube.com/s/player/5b77d519/www-embed-player.vflset/www-embed-player.js 659 535 13 https://www.youtube.com/s/player/5b77d519/player_ias.vflset/en_US/base.js 391 280 52 Unattributable 354 18 0 https://volbeatz.nl/ 247 14 2 https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js 72 66 2 https://www.youtube.com/embed/Vd7U5LfdHfQ 68 21 4 https://www.youtube.com/embed/Ey4Y4u6EQ9w 59 26 4 Minimizes main-thread work
2.0 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work
Category Time Spent Script Evaluation 1039 Other 499 Style & Layout 220 Script Parsing & Compilation 92 Garbage Collection 62 Parse HTML & CSS 46 Rendering 20 Avoids an excessive DOM size
268 elements
A large DOM will increase memory usage, cause longer style calculations, and produce costly layout reflows. Learn how to avoid an excessive DOM size.
Statistic Element Value Total DOM Elements Maximum DOM Depth div.text > figure.video > div.embed-container > iframe Maximum Child Elements main#main > div#agenda > div.text > ul Avoid large layout shifts
7 elements found
These DOM elements were most affected by layout shifts. Some layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS
Element Layout shift impact body > div#top > main#main 0 div#top > header#start > h1.logo > a.home-link 0 nav#navigation > ul.menu > li > a#menu1 0 nav#navigation > ul.menu > li > a#menu2 0 nav#navigation > ul.menu > li > a#menu3 0 nav#navigation > ul.menu > li > a#menu4 0 nav#navigation > ul.menu > li > a#menu5 0 Image elements do not have explicit
View Experiment!widthandheightSet an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
URL https://volbeatz.nl/media/pages/home/Volbeatz_Gigs.png https://volbeatz.nl/media/pages/home/Volbeatz_Gigs.png https://volbeatz.nl/assets/images/tirr-logo.png Serve static assets with an efficient cache policy
25 resources found
A long cache lifetime can speed up repeat visits to your page. Learn more about efficient cache policies.
URL Cache TTL Transfer Size (bytes) https://volbeatz.nl/assets/images/band.png 0 981114 https://volbeatz.nl/media/pages/home/Volbeatz_Gigs.png 0 653966 https://volbeatz.nl/assets/images/dark_leather.png 0 74716 https://volbeatz.nl/assets/images/tirr-logo.png 0 60535 https://volbeatz.nl/assets/js/modernizr.js 0 6589 https://volbeatz.nl/assets/images/english.png 0 3373 https://volbeatz.nl/assets/css/styles.css 0 3266 https://volbeatz.nl/assets/js/script.js 0 2619 https://volbeatz.nl/assets/images/fb.png 0 2288 https://volbeatz.nl/assets/js/responsiveslides.min.js 0 1754 https://volbeatz.nl/assets/images/mail.png 0 768 https://volbeatz.nl/assets/images/download.png 0 684 https://embedr.flickr.com/assets/embedr-loader.js 300000 435 https://static.doubleclick.net/instream/ad_status.js 900000 446 https://static.doubleclick.net/instream/ad_status.js 900000 0 https://www.google-analytics.com/plugins/ua/linkid.js 3600000 989 https://i.ytimg.com/vi/Vd7U5LfdHfQ/sddefault.jpg?sqp=-oaymwEmCIAFEOAD8quKqQMa8AEB-AH-CYAC0AWKAgwIABABGF4gFih_MA8=&rs=AOn4CLCoD5pXiGpFxZUnGdV-ufqvCgYTew 7200000 25675 https://www.google-analytics.com/analytics.js 7200000 21563 https://i.ytimg.com/vi/Ey4Y4u6EQ9w/sddefault.jpg?sqp=-oaymwEmCIAFEOAD8quKqQMa8AEB-AH-CYAC0AWKAgwIABABGGUgYChBMA8=&rs=AOn4CLCafoPZ1Nij_6_ht4sJlKMh9TdR_A 7200000 20053 https://embedr.flickr.com/assets/client-code.js 7200000 855 https://www.gstatic.com/eureka/clank/129/cast_sender.js 86400000 14971 https://yt3.ggpht.com/ytc/AIdro_mWqMJaBGTlJWspTQ3AyTqyfSW6cx_g_EIuRo3mgK17Bw=s68-c-k-c0x00ffffff-no-rj 86400000 2815 https://www.gstatic.com/eureka/clank/129/cast_sender.js 86400000 0 https://yt3.ggpht.com/ytc/AIdro_mWqMJaBGTlJWspTQ3AyTqyfSW6cx_g_EIuRo3mgK17Bw=s68-c-k-c0x00ffffff-no-rj 86400000 0 https://p.typekit.net/p.gif?s=1&k=gpa3xxw&ht=tk&h=volbeatz.nl&f=38.1717.1718.1719.1720.10327.14011&a=26613&js=1.21.0&app=typekit&e=js&_=1734014283348 604800000 205 User Timing marks and measures
56 user timings
Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences. Learn more about User Timing marks.
Name Type Start Time Duration mark_nreqs Mark 1313 mark_nreqs Mark 1328 mark_srt Mark 3051 mark_nress Mark 3051 mark_rsf_pc Mark 3063 mark_wffs Mark 3066 mark_srt Mark 3101 mark_nress Mark 3101 mark_rsf_pc Mark 3111 mark_wffs Mark 3118 mark_wffe Mark 3190 mark_wffe Mark 3193 mark_nrese Mark 3275 mark_rsf_pj Mark 3276 mark_rsf_pej Mark 3276 mark_nrese Mark 3282 mark_rsf_pej Mark 3283 mark_rsf_pj Mark 3284 mark_rse_pc Mark 3378 mark_rse_pc Mark 3382 mark_rse_pej Mark 3435 mark_rse_pej Mark 3437 mark_rse_pj Mark 4092 mark_rse_pj Mark 4096 mark_pe Mark 4173 mark_pe Mark 4218 mark_pot_isc Mark 4264 mark_pot_ist Mark 4268 mark_pot_csms Mark 4272 mark_pot_csmf Mark 4274 mark_fs Mark 4285 mark_ftr Mark 4295 mark_ep_init_pr Mark 4332 mark_pot_isc Mark 4395 mark_pot_ist Mark 4398 mark_pot_csms Mark 4403 mark_pot_csmf Mark 4404 mark_fs Mark 4415 mark_ftr Mark 4430 mark_ep_init_pr Mark 4471 mark_pot_ss Mark 4831 mark_pot_sf Mark 4924 mark_pot_xs Mark 4925 mark_pot_xf Mark 4930 mark_pot_ss Mark 4971 mark_pot_sf Mark 5107 mark_pot_xs Mark 5107 mark_pot_xf Mark 5117 mark_qoes Mark 5152 mark_pot_if Mark 5153 mark_pot_cms Mark 5153 mark_pot_cmf Mark 5155 mark_qoes Mark 5181 mark_pot_if Mark 5181 mark_pot_cms Mark 5181 mark_pot_cmf Mark 5183 Does not use passive listeners to improve scrolling performance
Consider marking your touch and wheel event listeners as
passiveto improve your page's scroll performance. Learn more about adopting passive event listeners.Source - URL: https://www.youtube.com/s/player/5b77d519/player_ias.vflset/en_US/base.js
- Line: 8578
- Column: 199
Passed Audits (15)
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Eliminate render-blocking resources
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. Learn how to eliminate render-blocking resources.
Avoid multiple page redirects
Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.
Preconnect to required origins
Consider adding
preconnectordns-prefetchresource hints to establish early connections to important third-party origins. Learn how to preconnect to required origins.Preload key requests
Consider using
<link rel=preload>to prioritize fetching resources that are currently requested later in page load. Learn how to preload key requests.Minify JavaScript
Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.
Minify CSS
Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.
Reduce unused CSS
Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. Consider using MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF to save network bytes. Learn more about efficient video formats
Largest Contentful Paint image was not lazily loaded
Above-the-fold images that are lazily loaded render later in the page lifecycle, which can delay the largest contentful paint. Learn more about optimal lazy loading.
Element body > div#top > header#start Remove duplicate modules in JavaScript bundles
Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers
Polyfills and transforms enable legacy browsers to use new JavaScript features. However, many aren't necessary for modern browsers. For your bundled JavaScript, adopt a modern script deployment strategy using module/nomodule feature detection to reduce the amount of code shipped to modern browsers, while retaining support for legacy browsers. Learn how to use modern JavaScript
Has a
<meta name="viewport">tag withwidthorinitial-scaleA
<meta name="viewport">not only optimizes your app for mobile screen sizes, but also prevents a 300 millisecond delay to user input. Learn more about using the viewport meta tag.Avoid non-composited animations
Animations which are not composited can be janky and increase CLS. Learn how to avoid non-composited animations
Use HTTP/2
HTTP/2 offers many benefits over HTTP/1.1, including binary headers and multiplexing. Learn more about HTTP/2.
Avoids
document.write()For users on slow connections, external scripts dynamically injected via
document.write()can delay page load by tens of seconds. Learn how to avoid document.write().Accessibility 95
Names and labels (1)
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Links do not have a discernible name
Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.
Failing Elements main#main > div#media > div.photo > a Fix all of the following:
Element is in tab order and does not have accessible text
Fix any of the following:
Element does not have text that is visible to screen readers
aria-label attribute does not exist or is empty
aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
Element has an empty title attributeAdditional Items to Check Manually (10)
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Interactive controls are keyboard focusable
Custom interactive controls are keyboard focusable and display a focus indicator. Learn how to make custom controls focusable.
Interactive elements indicate their purpose and state
Interactive elements, such as links and buttons, should indicate their state and be distinguishable from non-interactive elements. Learn how to decorate interactive elements with affordance hints.
The page has a logical tab order
Tabbing through the page follows the visual layout. Users cannot focus elements that are offscreen. Learn more about logical tab ordering.
Visual order on the page follows DOM order
DOM order matches the visual order, improving navigation for assistive technology. Learn more about DOM and visual ordering.
User focus is not accidentally trapped in a region
A user can tab into and out of any control or region without accidentally trapping their focus. Learn how to avoid focus traps.
The user's focus is directed to new content added to the page
If new content, such as a dialog, is added to the page, the user's focus is directed to it. Learn how to direct focus to new content.
HTML5 landmark elements are used to improve navigation
Landmark elements (`<main>`, `<nav>`, etc.) are used to improve the keyboard navigation of the page for assistive technology.
Offscreen content is hidden from assistive technology
Offscreen content is hidden with display: none or aria-hidden=true. Learn how to properly hide offscreen content.
Custom controls have associated labels
Custom interactive controls have associated labels, provided by aria-label or aria-labelledby. Learn more about custom controls and labels.
Custom controls have ARIA roles
Custom interactive controls have appropriate ARIA roles. Learn how to add roles to custom controls.
Passed Audits (21)
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Values assigned to
role=""are valid ARIA roles.ARIA
roles enable assistive technologies to know the role of each element on the web page. If therolevalues are misspelled, not existing ARIArolevalues, or abstract roles, then the purpose of the element will not be communicated to users of assistive technologies. Learn more about ARIA roles.[aria-hidden="true"]is not present on the document<body>Assistive technologies, like screen readers, work inconsistently when
aria-hidden="true"is set on the document<body>. Learn howaria-hiddenaffects the document body.[role]s have all required[aria-*]attributesSome ARIA roles have required attributes that describe the state of the element to screen readers. Learn more about roles and required attributes.
[role]values are validARIA roles must have valid values in order to perform their intended accessibility functions. Learn more about valid ARIA roles.
Background and foreground colors have a sufficient contrast ratio
Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.
Document has a
<title>elementThe title gives screen reader users an overview of the page, and search engine users rely on it heavily to determine if a page is relevant to their search. Learn more about document titles.
[id]attributes on active, focusable elements are uniqueAll focusable elements must have a unique
idto ensure that they're visible to assistive technologies. Learn how to fix duplicateids.<frame>or<iframe>elements have a titleScreen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.
Heading elements appear in a sequentially-descending order
Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.
<html>element has a[lang]attributeIf a page doesn't specify a
langattribute, a screen reader assumes that the page is in the default language that the user chose when setting up the screen reader. If the page isn't actually in the default language, then the screen reader might not announce the page's text correctly. Learn more about thelangattribute.<html>element has a valid value for its[lang]attributeSpecifying a valid BCP 47 language helps screen readers announce text properly. Learn how to use the
langattribute.Image elements have
[alt]attributesInformative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the
altattribute.Image elements do not have
[alt]attributes that are redundant text.Informative elements should aim for short, descriptive alternative text. Alternative text that is exactly the same as the text adjacent to the link or image is potentially confusing for screen reader users, because the text will be read twice. Learn more about the
altattribute.Input buttons have discernible text.
Adding discernable and accessible text to input buttons may help screen reader users understand the purpose of the input button. Learn more about input buttons.
Form elements have associated labels
Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more about form element labels.
Links are distinguishable without relying on color.
Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.
Lists contain only
<li>elements and script supporting elements (<script>and<template>).Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.
List items (
<li>) are contained within<ul>,<ol>or<menu>parent elementsScreen readers require list items (
<li>) to be contained within a parent<ul>,<ol>or<menu>to be announced properly. Learn more about proper list structure.[user-scalable="no"]is not used in the<meta name="viewport">element and the[maximum-scale]attribute is not less than 5.Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.
Skip links are focusable.
Including a skip link can help users skip to the main content to save time. Learn more about skip links.
No element has a
[tabindex]value greater than 0A value greater than 0 implies an explicit navigation ordering. Although technically valid, this often creates frustrating experiences for users who rely on assistive technologies. Learn more about the
tabindexattribute.Not Applicable (32)
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[accesskey]values are uniqueAccess keys let users quickly focus a part of the page. For proper navigation, each access key must be unique. Learn more about access keys.
[aria-*]attributes match their rolesEach ARIA
rolesupports a specific subset ofaria-*attributes. Mismatching these invalidates thearia-*attributes. Learn how to match ARIA attributes to their roles.button,link, andmenuitemelements have accessible namesWhen an element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn how to make command elements more accessible.
Elements with
role="dialog"orrole="alertdialog"have accessible names.ARIA dialog elements without accessible names may prevent screen readers users from discerning the purpose of these elements. Learn how to make ARIA dialog elements more accessible.
[aria-hidden="true"]elements do not contain focusable descendentsFocusable descendents within an
[aria-hidden="true"]element prevent those interactive elements from being available to users of assistive technologies like screen readers. Learn howaria-hiddenaffects focusable elements.ARIA input fields have accessible names
When an input field doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn more about input field labels.
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