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The reason you are having processor problems is you probably find you are using a 32bit processor with hyperthreading they are really inefficent compaired to todays 64bit server processors.
Xortify doesn't really do all that much when it comes to load on your system, just the code is more designed and tested on a 64bit processor so these older processors probably do have threading issues with much of my software.
I suggest you re-enable xortify, essentially the task xortify perform on an IP, Username and email address is the following:
Get Details -> Check for Cache Result -> No cache result found poll API -> save details in cache -> ban user if criteria is met
and that is all to it.. It really isn't doing any realy major number crunching, and i will be looking into spiders soon for you all for the 2.5 Final and 2.6 versions.