[Spamassassin Wiki] Update of "FasterPerformance" by PeterGervai

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

The comment on the change is:
Some data on measured delays of network tests

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  See OutOfMemoryProblems.  Much of the advice applies for CPU-bound machines, too.
  
+ == Network related ==
+ 
+ If you are UsingNetworkTests, install a local DNS server (BIND named, for example) on the same host to cache responses, and set the /etc/resolv.conf file to use that instead of one on another machine.  See CachingNameserver.
+ 
+ External network tests often take long time (compared to a non-network installation). See UsingNetworkTests for general hints.
+ 
+  * Pyzor (see UsingPyzor) tests seem to be one of the most time consuming: it may raise scanning time by more than 10 seconds per check. 
+  * DCC (see UsingDcc) may add 3-5 seconds to testing time.
+