From Lunarpages Web Hosting Wiki
What other accelerators out there do you suggest for our VPS hosting plan?
One of the best accelerators out there is eAccelerator. There are also a few others rather popular:
- Alternative PHP Cache - http://apc.communityconnect.com/
- PHP Accelerator - http://www.php-accelerator.co.uk/
- AfterBurner Cache - http://www.bwcache.bware.it/
If you are planning to use a PHP accelerator on your server, you would give a try to each of them for a some period to see how this affects server load. Just don't forget to make copy of backup files you'll be modifying (php.ini in first place) to be able to revert back in case of any worse behavior.