Basic Performance Tuning
Disable Spamassassin
If you are not using Spamassassin for mail filtering, then turn it off. The spamd processes uses a good chunk of your VPS's memory.
1. Login to WHM, go to Server Configuration -> Tweak Settings. In the Mail subsection, uncheck Spamassassin.
2. Then go to Service Configuration -> Service Manager. Uncheck both boxes for spamd.
Install eAccelerator
This may already be installed on your VPS. If not, use these instructions to Install.
Enable mod_gzip
Run the command /scripts/easyapache from the command line to modify the Apache config or go to WHM -> Software -> Apache Update
Reverse DNS Tracking
You generally don't need to have the server waste time and resources looking up the hostname for every IP address on the fly.
1. Login to WHM, go to Server Configuration -> Tweak Settings. Under Stats Programs, uncheck AWStats Reverse Dns Resolution.
2. Apache defaults to reverse lookups being off. This is in the httpd.conf file, and is defined with Hostname Lookups Off. Keep it this way.
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