If you just want the tickcount you can use Environment.Tickcount or something similar (dont got .Net here, so cant check it for you.. shouldn't be hard to find.)
Otherwise, you do have a namespace to handle all diffrent kinds of performance counters... (CPU load, mem usage, etc... ) dont know what its called anymore though. I can check this when i get home later today.. just wait a couple of hours

Hope that helps,
-- Loffen