Apparently audio murders your fps in lo-mac. A hit is to be expected, but we're talking on the order of 50%. The more sounds you have playing the worse it is. A lot of people have had luck turning off hardware acceleration.
I went into options and select audio on the dial and unchecked everything except SOUND. This gives me an extra 15 FPS, so for me at least, it is a very real way to gain some serious performance. Guess a lot of people have been ditching SB Live cards for onboard or others too since they are taking a real licking here.
Audio killing FPS.
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