govedea: I believe there are instructions for hacking those files manually inside Whos_Online_ReadMe.txt .. Check that out!
mark99: Calling it via SSI () is MUCH better than using virtual because using ubb_whos_online_ssi.cgi only loads the required wordlets and config files. If you're using ultimatebb.cgi?ubb=whos_online_ssi, you're loading all the hefty files that come along with ultimatebb.cgi. In short, ubb_whos_online_ssi.cgi is MUCH, MUCH better!
In regards to improving speed, there are several ways I can tweak your individual site but there's nothing really major. The most common is setting the Time Until Logged Out to 5 minutes and Refresh Who's Online Detailed Page to 0. Disable the Record Book as well. If that doesn't help, you can try removing the _lck related lines in ubb_whos_online.cgi but beyond that .. there's nothing I can really do except to suggest to you to wait for 6.2 in which WOL would come by default on UBB.
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