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TTFB more than Start Render. Is this valid?
07-27-2018, 08:04 AM (This post was last modified: 07-27-2018 08:07 AM by samear.)
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RE: TTFB more than Start Render. Is this valid?
@abhagupta

was your test running on the same machine, same browser all the time?

Remember JS, CSS execution time depends on client machine's CPU and memory.
I also notice that walmart's base page is running on HTTP/2 protocol.
Does walmart still have HTTP/1.1? If yes, you might want to try if this can be reproduced on HTTP/1.1.

But my main concern is that why the page stays blank for 2 seconds based on my test below.
https://www.webpagetest.org/result/18072...b731bb27b/
there are 20 assets contribute to the blank page.
there is a huge JS file (almost 0.5MB despite it's already compressed) on line 10 taking 1.5s to download + execution time.
I would suggest you profile all JS files that are in the the first 2 seconds.

I suggest to use Windows Performance Toolkit (free from Microsoft) to do JS profiling and do it on a medium size machine with warm cache.
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RE: TTFB more than Start Render. Is this valid? - samear - 07-27-2018 08:04 AM

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