vBulletin has a build in option for using gzip compression, no need for a gzip.php or such.
Just go to your AdminCP -> vBulletin Settings and enable GZIP.
This will (ZIP) compress the HTML page, then send it to the browser that will uncompress and display the page.
This way you can save quite some bandwidth on your server, indeed.
This adds some more loadon the server (depending on compression level) and not all browsers support it (in that case the compression in skipped).
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