Most modern browsers default to two simultaneous threads per hostname. This leads to overhead and latency as the browser will only grab two objects at a time. One of the biggest pitfalls of vBulletin (especially 4.0) is the amount of graphics and javascript served from the same hostname. Setting up parallel hostnames is fairly simple and I’ll outline the steps on a cPanel installation and vBulletin 4.0 stylevars system. The entire process doesn’t take more than 15 minutes even for novice users, and you can easily do more to further optimize your vBulletin.

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