[NickyDee]

This only really matters if your site is particularly slow. In the past, we used to live or die by page loading times - but fortunately these days most internet connections are so fast that for a standard website they will appear to load pretty much instantly anyway, so load times only become important for video or music streaming sites.

If google reports a load time of 3-5 seconds for most pages then that really isn't that bad. If you're looking at 5-10 second on every page then that might want addressing as their is a systematic problem going on, in so much as your server is either struggling or its connection to the internet is slow (or too small to cope with the number of connections).

Hammering out the ineffeciencies in vBulletin may squeeze a little bit of lag out of the load times, but really if the site is slow its probably the hardware or connection that need addressing not vbulletin.