UB: CPU use at idle, room for improvement?

I have a working UB standalone – not so difficult after all, very nice job C74!

MIDI-only, no audio support included.

CPU use at idle seems a tad high, 11-12% on a MacBook Pro 2GHz.
The same is true for the Max app itself.

Idle CPU use for the UB on much slower PPC (1GHz G4) about 7-8% for both.

On PPC with 4.5.7 it’s about 5%.

Debug code? Can this be improved for the UB, on Intel especially? I know users will bug me about this, no matter how many times I explain it’s not necessarily "real".