Oh, haha. I should have checked out the recommended addon, not just assumed it worked the same as mine. I use
Broker_CPU which lists the time used by addons in seconds of CPU activity. That is a much more useful measure, because it gives me the absolute cost, not the relative cost, of running that addon.
In which world OmniCC is still pretty surprisingly high on the list of things that eat CPU.
Anyway, if you are trying to figure out what is causing problems Broker_CPU might be more useful. I was able to see that after fifteen minutes of gameplay, for example, the "trade chat forwarding" addon I had ate about three minutes of CPU time, and that led me to disable it and figure out what caused that constant, painful skip in the UI.