How to configure the gzip HTML output pages compression in vBulletin?
The GZIP functionality allows you to compress the HTML output of forum pages and reduce the bandwidth usage.
To turn on the corresponding functionality and set the compression level, go to your vBulletin admin control panel > Settings > Options > Cookies and HTTP Header Options.
You can check whether the GZIP compression is supported on your server by following the solution published in our Knowledge Base article.