I'm running mupen64plus v1.99.4 (ubuntu friendly) Fedora 14 but have been having some issues with severe stuttering in some games, (Perfect Dark, Goldeneye 007). I have been able to run Super Mario 64 with no problems at all. I was just wondering if my system isn't up to the task, the one core of my CPU runs at 80-100%.
Before switching to linux I had run Project64 on windows and don't remember having any of these problems.

My system is a standard spec Acer 5633WLMi
Processor: Intel® Core™2 Duo T5500 Mobile processor (1.6 GHz 2 Duo Core)
Memory: 1024MB DDR2 (1GB)

Any help in getting it running smoother would be very much appreciated!