johnd01

Thanks for the quick reply.

I do not see how setting priority or affinity will help me if there is almost always an ideal core. Excel does use use 2 threads at times. Even then it will not use 100% of the 2 cores but rather spreads across all 4 cores. System would run better if it did not spend so much time switching Excel in and out of CPUs.

I know this is not UNIX but if it were I would configure Excel to get longer slice times rather than set a high Priority.
If I set the other 70 processes to run in CPU 0 and leave CPU 1-3 for Excel would Excel spend more run time on a CPU rather than spending time switching?