[wp-trac] [WordPress Trac] #57916: Explore and assess 6.2 server-side performance regressions

[WordPress Trac]

#57916: Explore and assess 6.2 server-side performance regressions
----------------------------+--------------------------
 Reporter:  flixos90        |       Owner:  flixos90
     Type:  task (blessed)  |      Status:  assigned
 Priority:  normal          |   Milestone:  6.2
Component:  General         |     Version:  trunk
 Severity:  normal          |  Resolution:
 Keywords:                  |     Focuses:  performance
----------------------------+--------------------------

Comment (by joemcgill):

 As a second data point here, I quickly ran some tests locally using wp-env
 to spin up a site with the following config:



 {{{
 {
     "config": {
         "WP_DEBUG": false,
         "WP_DEBUG_LOG": false,
         "WP_DEBUG_DISPLAY": false,
         "SCRIPT_DEBUG": false
     }
 }
 }}}

 I set loaded the Twenty Twenty-One theme and ran tests of 20 requests
 using the Apache Bench tool (i.e., `ab`) for WP 6.1.1, 6.2-beta1, and
 6.2-RC1, respectively, using WP CLI to update the site so the zip packages
 would be applied. Here are the results that I got from these tests:


 {{{
 ## 6.1.1
 Document Path:          /
 Document Length:        62259 bytes

 Concurrency Level:      1
 Time taken for tests:   1.627 seconds
 Complete requests:      20
 Failed requests:        0
 Total transferred:      1250420 bytes
 HTML transferred:       1245180 bytes
 Requests per second:    12.29 [#/sec] (mean)
 Time per request:       81.367 [ms] (mean)
 Time per request:       81.367 [ms] (mean, across all concurrent requests)
 Transfer rate:          750.38 [Kbytes/sec] received
 Connection Times (ms)
               min  mean[+/-sd] median   max
 Connect:        0    0   0.0      0       0
 Processing:    52   81  89.5     56     458
 Waiting:       30   56  84.6     34     415
 Total:         52   81  89.5     57     459

 Percentage of the requests served within a certain time (ms)
   50%     57
   66%     70
   75%     70
   80%     71
   90%     98
   95%    459
   98%    459
   99%    459
  100%    459 (longest request)

  ## 6.2-beta1
 Document Path:          /
 Document Length:        62433 bytes

 Concurrency Level:      1
 Time taken for tests:   1.448 seconds
 Complete requests:      20
 Failed requests:        0
 Total transferred:      1253900 bytes
 HTML transferred:       1248660 bytes
 Requests per second:    13.81 [#/sec] (mean)
 Time per request:       72.390 [ms] (mean)
 Time per request:       72.390 [ms] (mean, across all concurrent requests)
 Transfer rate:          845.77 [Kbytes/sec] received

 Connection Times (ms)
               min  mean[+/-sd] median   max
 Connect:        0    0   0.0      0       0
 Processing:    44   72 101.5     47     503
 Waiting:       26   53  98.5     29     471
 Total:         44   72 101.6     47     503

 Percentage of the requests served within a certain time (ms)
   50%     47
   66%     51
   75%     54
   80%     56
   90%     70
   95%    503
   98%    503
   99%    503
  100%    503 (longest request)

 ## 6.2-RC1
 Document Path:          /
 Document Length:        62613 bytes

 Concurrency Level:      1
 Time taken for tests:   1.289 seconds
 Complete requests:      20
 Failed requests:        0
 Total transferred:      1257500 bytes
 HTML transferred:       1252260 bytes
 Requests per second:    15.51 [#/sec] (mean)
 Time per request:       64.475 [ms] (mean)
 Time per request:       64.475 [ms] (mean, across all concurrent requests)
 Transfer rate:          952.33 [Kbytes/sec] received

 Connection Times (ms)
               min  mean[+/-sd] median   max
 Connect:        0    0   0.0      0       0
 Processing:    43   64  69.6     49     360
 Waiting:       26   45  67.0     29     329
 Total:         43   64  69.6     49     360

 Percentage of the requests served within a certain time (ms)
   50%     49
   66%     51
   75%     52
   80%     54
   90%     56
   95%    360
   98%    360
   99%    360
  100%    360 (longest request)

 }}}

 I'd like to retry this process using the same server timing method that
 @flixos90 has reported, but from this initial simple set of checks, it
 would seem to confirm what our automated performance workflows have been
 saying, which is that Twenty Twenty One is loading faster on WP 6.2 than
 on WP 6.1 in a default configuration.

 @flixos90  could you add more detail about the method you're using to get
 the results you're seeing so that I and others can try to reproduce?

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/57916#comment:4>
WordPress Trac <https://core.trac.wordpress.org/>
WordPress publishing platform