Goodest had lots of good suggestions, but I'd just add one more: play with your graphics settings. On my laptop I used to crank all the graphics settings up, but then I started seeing intermittent lag. After awhile I realized I could have every last setting on max ... as long as I didn't enable shadows.
Don't know if you have shadows enabled specifically, but my point is more that if you play with the graphics settings you might find that certain ones cause the lag.
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