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Got any info on tweaking Halo. Its really choppy on thePC!
Upgrade to a better PC. That's all I can say. If the game slows down frequently, try lowering your settings. It's more important getting that 3SK than to see your dead body lying on the ground with a respawn counter in the top left corner of your screen in high-resolution.
Only time I get a laggy looking screen is when occasionally i switch framerate to vysync or 30 fps by accident. Make sure your on no vysync. Thats all I advise. The rest, like scanning compute, ect, up to you.