prevent wp_count_users
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I manage a website that has over 110,000 WordPress users. The WP Admin interface has become really slow (it takes about 10 seconds for each page to load). Using the Debug Bar plugin, I narrowed it down to a function called count_users().
This function fires on every admin page load, but only when the w3tc plugin is enabled. If I disable the w3tc plugin, count_users() not called, and WP Admin is fast again.
I’ve tried to dig into w3tc source to figure out why count_users() is getting triggered, but haven’t had any luck so far.
Does anyone have any idea why this is happening, and/or what I can do to fix it?
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After further investigation, it turns out that w3 total cache is causing an issue with the
update_coretransient.On line 636 of
wp-includes/update.php, you’ll find the following line:$current = get_site_transient( 'update_core' );When the plugin is enabled, this line fails;
get_site_transient( 'update_core' )returns false. This causeswp_version_check()to be called on every page load.I will continue to investigate to figure out why w3 total cache is affecting the
update_coretransient, but some input would be greatly appreciated.However, this is not the cause of the slowdown (neither is count_users). Even when I comment these functions out of WP Core, WP Admin is still slow. With the plugin disabled, WP Admin is fast.
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