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Test tools variance speed results
11-25-2015, 06:28 AM
Post: #3
RE: Test tools variance speed results
(11-25-2015 03:07 AM)pmeenan Wrote:  Pingdom is expected to be radically different because they don't apply any traffic shaping. Historically they also haven't used real browsers but I'm not sure if that's still the case (their UA string looks like Chrome 39).

As far as GTMetrix goes, I'm not sure what is going on with their test but the traffic shaping doesn't look to be working correctly (though it may be close). Some quick back-of-the-napkin numbers using the 2.14MB total bytes they recorded and 5Mbps connection profile:

2.14 MB * 8 bits per byte * 1024 KB per MB * 1024 B per KB = 17,951,621 bits
5 Mbps * 1000000 / 1.026 (2.6% TCP overhead) = 4,873,294 bits per second
17,951,621 / 4,873,294 = 3.68s

So, on a perfectly warm connection with no round trip delays of any kind it would take ~3.7 seconds to transfer the 2.14MB of page data. 2.9s isn't physically possible. There's a few hundred ms of round trip times waiting for the first byte and also TCP slow start so 4-5 seconds on a 5Mbps connection looks about right.

Hi pmeenan,

Thanks for getting back. That's clever stats :-). I've always wondered about the variance, these other speed tools are quoted by so many tech people as evidence of a fast site but they seem a weak measure, fundamentally flawed.

Ok, obviously I've got some work still to do to get a faster site. Could I grab some advice? I'm not a developer I've done pretty much all I can bare getting an expensive hosting solution (is this the solution). I'm with SiteGround (best shared option), Static, dynamic, and mem cache tools enabled, + use of WP Rocket cache tool + CloudFlare Pro, aggressive photo optimise.

Would you have any general / simple advice that could help a non tech like me get a better speed for our customers?

Big thanks
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RE: Test tools variance speed results - kpmcgee73 - 11-25-2015 06:28 AM

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