I'm using WP alongside Invisionboard.
I am utilizing the eacclerator function of my web host to speed up my forum and it definately works. I have edited the conf-global.php (which is the config file for IPB) by adding one line as below to enable it.
$INFO['use_eaccelerator'] = '1';
Is there a file in WordPress install that I can tweak so I can enable eaccelerator for WP?