Title: Heavy load causing cache flush
Last modified: August 21, 2016

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# Heavy load causing cache flush

 *  Resolved [Topher](https://wordpress.org/support/users/topher1kenobe/)
 * (@topher1kenobe)
 * [13 years, 2 months ago](https://wordpress.org/support/topic/heavy-load-causing-cache-flush/)
 * The other day we came under a DOS attack, just a brute force on our login page.
   The cache started flushing about every 20 seconds or so, which caused server 
   load to spike pretty hard.
 * At the time I thought it may have been some odd get vars they were sending that
   did it, but today we have legitimite heavy load and it’s happening again.
 * What would cause the cache to flush when I need it most?
 * We’re not using WP comments, and it’s happening far to often to be from people
   making posts.
 * We’re running as a network install, and ALL the sites are flushing at once.
 * [http://wordpress.org/extend/plugins/wp-super-cache/](http://wordpress.org/extend/plugins/wp-super-cache/)

Viewing 1 replies (of 1 total)

 *  Thread Starter [Topher](https://wordpress.org/support/users/topher1kenobe/)
 * (@topher1kenobe)
 * [13 years, 2 months ago](https://wordpress.org/support/topic/heavy-load-causing-cache-flush/#post-3649427)
 * As it turns out, WordPress SEO by Yoast flushes the cache WAY too often. Under
   heavy load it can do it as often as every few seconds. The funtion running the
   flush is the one that checks to see if there’s an update for the plugin.
 * We commented out the calls to the cache flush in that function and the problem
   completely went away.

Viewing 1 replies (of 1 total)

The topic ‘Heavy load causing cache flush’ is closed to new replies.

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## Tags

 * [load](https://wordpress.org/support/topic-tag/load/)

 * 1 reply
 * 1 participant
 * Last reply from: [Topher](https://wordpress.org/support/users/topher1kenobe/)
 * Last activity: [13 years, 2 months ago](https://wordpress.org/support/topic/heavy-load-causing-cache-flush/#post-3649427)
 * Status: resolved