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First Byte Time grade is too strict in Simple Testing mode
10-02-2018, 05:41 AM
Post: #2
RE: First Byte Time grade is too strict in Simple Testing mode
The grade is not a fixed number and is generally calculated based on the RTT to the edge. It should allow for 1 RTT each for DNS, Socket connect, TLS and the request itself + 100ms for "server think time" before the grade stops dropping.

I believe the TLS time is actually a little more generous and it just allows for however long TLS took so it doesn't penalize for not stapling and using EV certs (which require validation and a TON more round trips) but in principle it is supposed to be looking for > 100ms of server think time. Any redirects will also kill the grade so be sure to be testing the final destination URL.

If you have examples where the grade took a dive but it doesn't look like it's because of the server response time being slow I'm happy to take a look. The actual implementation is here: https://github.com/WPO-Foundation/webpag...c.php#L205
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RE: First Byte Time grade is too strict in Simple Testing mode - pmeenan - 10-02-2018 05:41 AM

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