100% cpu and incredible lag on a good computer, been happening on and off for years

[Zachk]

I would like better optimization for this. I love this program to DEATH, but the problem is; my game will randomly plummet from 120 fps all the way to 10! And my cpu would go to 100%.

Here's my DXDiag: http://www.mediafire.com/view/?59c7n3ran5yt55f

My version is the current beta: 20.3.10