Also be mindful whether or not your server has mod_gzip compiled directly into apache.
If this is the case, you can disable the php-based gzip feature in vbulletin all together and save yourself some processor cycles.
You can check by telnetting to your webserver on port 80 and:
HEAD / HTTP 1.0
GET <enter>
<enter>
It'll print out something along the lines of this if you're dealing with a unix/apache box.
Server: Apache/1.3.24 (Unix) mod_gzip/1.3.19.1a PHP/4.1.2
FYI
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