[jitter] [boring] optimizing with shark output

I'm looking at the shark output from running a video patch, and it looks like most of the cpu usage (37%, according to shark) is a result of 
ml_set_interrupts_enabled from the mach_kernel library.
Like a bureacrat looking at education and entitlement programs to "balance" the budget, I'm looking at slimming down the big part of this pie.
I searched Google for more information on what this might point to...but not much was deciperable. Are there some general guidelines to tune my patch to reduce this massive cpu usage, or is that just a natural part of having a complex patch, or is there really no way to tell without looking at a patch?

curious...

Peter.
--
* * * *
The Altamont
2 oz light rum
3/4 oz lime juice
1/2 oz orange curaçao
1/4 oz orgeat
splash of pernod
handful of fresh mint leaves
shake contents vigorously with ice.
Strain well into a chilled cocktail glass.
* * * *