CPU high usage on one core

ImLovely

Honorable
Apr 25, 2012
5
0
10,510
I started playing an mmorpg called Trickster Online. I noticed that sometimes, randomly, it would spike in usage on one of the cores of my CPU and stay that way. If I changed the affinity the usage would just skip over to the next core. I've noticed some other applications tend to stick to one core although a different one, like core #3 instead of #2. What is the cause of this?

Here's a screenshot:
http://img140.imageshack.us/img140/8787/usageproblem.jpg