[wp-trac] [WordPress Trac] #55833: Interference with the zlib output compression

[WordPress Trac]

#55833: Interference with the zlib output compression
--------------------------+-----------------------------
 Reporter:  mjkhajeh      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Cache API     |    Version:  6.0
 Severity:  critical      |   Keywords:
  Focuses:  performance   |
--------------------------+-----------------------------
 I activated zlib.output_compression from control panel(DirectAdmin) of
 hosting and this error has shown in my WP:


 {{{
 Notice: ob_end_flush(): failed to send buffer of zlib output compression
 (1) in /home/****/domains/****/public_html/wp-includes/functions.php on
 line 5275

 Notice: ob_end_flush(): failed to send buffer of zlib output compression
 (1) in /home/****/domains/****/public_html/wp-includes/functions.php on
 line 5275
 }}}

 This error is in both frontend and wp dashboad.

 I disabled all plugins and change theme to default but it was still the
 error.

 This error causes a great drop in site speed both on the frontend and in
 the backend. The Query Monitor plugin also reports various slow queries
 that change as the page refreshes. All of these queries are also common
 WordPress queries.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55833>
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