Uinstall the game, and before you reinstall it, make sure that you've set the powersaving options of the laptop to 'always on' (or turn off speedstep)
It's a problem with Intel's Speedstep, well, not really a problem so much as a feature, actually. When non-CPU intensive tasks are occurring, the CPU is underclocked (the P-M has two speeds: it's maximum, in your case 1.5GHz, and a 'speedstepped' speed: 600MHz for powersaving.)
When you install the game, it's not CPU intensive. So it thinks the CPU is such-and-such a speed (600MHz). When it comes to play, the CPU increases it's speed because it is intensive (to 1500MHz), and everything goes at warpspeed because of it. :)
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