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jdog
Asked: 2017-09-03 23:36:56 +0800 CST

Cloudfront HTTP2 css, js slow Time to First Byte even with cache HIT

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I have a website hosted on EC2 with most css, JS and images loaded from Cloudfront. There is a consistent problem that even small css and js files have 1-2 seconds time to first byte, even where there is a cache hit on Cloudfront. Here is a screenshot from websitepulse:

enter image description here

None of these css files are particularly large. I have also run this test twice straight after each other, but there seems to be no difference.

Is there any limit I may be hitting on Cloudfront? Or any sort of interdependence of requests because of HTTP2?

amazon-cloudfront

1 Answers

  1. I was having TTFB as 1.5s. After few hours of digging, I realised that the reason was in my ... DNS.

    I was using some family safe DNS which was causing the lag. Switching back to Google's 8.8.8.8 did the trick.

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