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Slow PNGs and GIFs ?
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Slow PNGs and GIFs ?
11-22-2011, 12:49 AM
Post: #1
Slow PNGs and GIFs ?
Hi,
after migration to new machine, we did some optimalisation of the pages. The biggest issue seems to be with the image files, as it takes several seconds to download them (altho having only some 17Kb ...). Here is current waterfall

http://www.webpagetest.org/result/111121...1/details/

Please the very long bars for GIFs and PNGs Sad For Example this

URL: http://img1.valka.cz/images10/homepage_icons/ico-01.png
Host: img1.valka.cz
IP: 89.185.250.36
Location: Czech Republic*
Error/Status Code: 200
Start Offset: 2.952 s
DNS Lookup: 225 ms
Initial Connection: 160 ms
Time to First Byte: 317 ms
Content Download: 1819 ms
Bytes In (downloaded): 17.8 KB
Bytes Out (uploaded): 0.4 KB


The webserver is Lighttpd, multiple 15k SAS disks in raid serving the files, no significant load (8 cores, load average: 0.21, 0.47, 0.41, iostat acting cool as well), 1Gbps network on backbone.

When I do local (same country) test using Google Chrome and Page Speed extension, I get speed for ico-01.png like 10ms instead of those 1800ms. Im connected on shared 10Mbps wifi line.


I wonder, what makes such a horrible difference ? Does it take like two seconds for 17Kb to travel from Europe to webpagetest server ?

(please note that putting amazon CDN instead to serve those files didnt change a thing, please see this result

http://www.webpagetest.org/result/111120...#request44

)

Or is there any problem with recieving PNG / GIF files ? I really cannot understand those results Sad

Thanks for any advice !
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Messages In This Thread
Slow PNGs and GIFs ? - Letus - 11-22-2011 12:49 AM
RE: Slow PNGs and GIFs ? - laboot - 11-22-2011, 06:53 AM
RE: Slow PNGs and GIFs ? - Letus - 11-23-2011, 01:08 AM
RE: Slow PNGs and GIFs ? - LeptienM - 11-23-2011, 06:26 PM
RE: Slow PNGs and GIFs ? - Marvin - 11-23-2011, 08:33 PM
RE: Slow PNGs and GIFs ? - Letus - 11-25-2011, 02:12 AM
RE: Slow PNGs and GIFs ? - Letus - 11-25-2011, 07:27 PM
RE: Slow PNGs and GIFs ? - Letus - 12-10-2011, 03:56 AM

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