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advice please - running 4x way CDN test what should i test for?
07-08-2015, 07:16 AM
Post: #4
RE: advice please - running 4x way CDN test what should i test for?
I'll second JMTC's recommendations for metrics – I like TTFB and time-to-render using WPT. The main bit of advice I'd have is general stats work: averages are exceptionally misleading – one slow sample will seriously skew your results – so you want to make sure that you get at least a few percentiles.

I typically look at 50th, 75th, 90th and 98th and, where possible, try to ensure that those tests include both cache hits and misses. In my experience, most CDNs are in the same ball-park for cache hits – modulo regional connectivity, of course – but you can see more substantial variations for cache misses and those are going to be the most painful user experience (e.g. a miss on an HTML page which spends 5+ seconds in the CDN's network).
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RE: advice please - running 4x way CDN test what should i test for? - acdha - 07-08-2015 07:16 AM

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