[Spamassassin Wiki] Update of "FasterPerformance" by DuncanFindlay

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The following page has been changed by DuncanFindlay:
http://wiki.apache.org/spamassassin/FasterPerformance

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   * Remove and re-add rule set files one at a time, and check performance after each change. If one rule set file causes a huge change in performance, take appropriate action. 
  
  Examine the custom rules you create, or have downloaded from third parties.  Poorly-written regular expressions can use resources exponentially.  Avoid body, rawbody, or full rules that use {{{+}}} or {{{*}}} quantifiers. 
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+ If you're having period load spikes, it could be because the Bayes database is re-syncing and expiring old tokens. See BayesForceExpire for a workaround.
  
  == If you are memory-bound ==