I tried to make nfs rivals run at 60fps, now It's super laggy

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I downloaded NFS rivals, and I could run it fine at maximum settings, always getting a constant 30fps, never wavering from it. However, I was a little disappointed that the game could only run at 30, so I tried the "fix" to make it run at 60fps. The method was putting in "-GameTime.MaxSimFps 60 -GameTime.ForceSimRate 60 +" into the shortcut of the game. Now however, instead of running at 30, it runs at 15-20 fps, and the game is really slow. I tried taking it out of the shortcut and running the game again, but the problem still persisted. Is there anyway I can revert this change to get back to the normal 30fps? 

[EA_David]

Normally deleting your local settings files will clear this stuff up.

You can find the files at Documents\Ghost Games\Need for Speed Rivals\settings. Be sure to make a backup elsewhere first, then delete these. When the game starts up and doesn't see these files, it'll create a new set from a generic template.