[wp-trac] [WordPress Trac] #51297: The new WordPress 5.5.1 create 600ms TTFB respund

[WordPress Trac]

#51297: The new WordPress 5.5.1 create 600ms TTFB respund
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 Reporter:  123nadav      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  5.5.1
 Severity:  critical      |   Keywords:
  Focuses:  performance   |
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 Hey hello, how are you guys?
 after a lot of optimization and chacks, we find out the core has an issue
 with TTFB.
 the old version 5.5 the first one was with TTFB 0.08
 sometimes jump to 0.12 but it was amazing performance...

 the last update 5.5.1 before week ago destroy everything... more 600ms
 you can check in page speed i have 3 identical sites and one is without
 tag manager for
 testing performance:
 locksmithunit.com
 locksmithunit.cat - no tag manager - more fast - for testing
 locksmithunit.es

 i tried with the THEME DEVELOPER even to change the THEME to WordPress
 THEME.
 (like twenty twenty).

 but still without any plugin after restart + refresh cpanel server
 nothing work... the issue is in the core...
 i even tried another server but the problem is the same...
 the core of WordPress 5.5.1 or something there is blocking and create TTFB
 of 600
 more from the older version (the first 5.5 was the best)

 you can check the site in page speed, and see.
 My sites don't have any error...
 All of them fully optimize, with server c-panel NGINX for high
 performance.

 I hope the fix will come soon and you will come back to TTFB of 0.08,
 like one version before 5.5.1.

 Regards,
 Nadav Levi Yahel
 Locksmith Unit

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Ticket URL: <https://core.trac.wordpress.org/ticket/51297>
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