In addition to what has been mentioned already, one very easy tweak is to adjust your crontab entries where it makes sense. Some scripts instruct you to have them run every minute but you don't always need this. Maybe you can have them run every other minute (*/2) or every three minutes (*/3). Before you try it check with the author of the script to make sure this will not cause any side effects.
You might also consider the use of 'nice' or something of that sort. Stats programs such as awstats can be resource hogs depending on how they are set up. If you are pushing your server maybe you will want to change awstats to run only once or twice a day instead of say hourly or every 30 minutes.
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