Chewie

I recently discovered a addon for vbulletin that should speed things up a bit.
YSLOW 1.0.3 (Make Your Forum Faster) - vBulletin.org Forum

To see what the plug-in does exactly one needs two firefox extensions.

Firebug has been a handy Firefox extension for web developers for some time now.

Just discovered YSlow which is addon for the Firebug extension.

YSlow lists performance issues that can plague a website and pages and gives advice on how to correct them.

The YSlow addon for vbulletin just makes it easier for you to address those issues on a vbulletin forum.

It's not really limited to vbulletin. It can actually be used on any Apache/PHP based server.