Two different experiences:
On my Athlon XP 2600+, it was sluggish (4FPS), but with some kind of sound. 100% CPU use (running eCS2). No shots.
On my i7 2600. it run decently at 35FPS, with sound (although somewhat sloppy), using only 80% of one of the four cores (running Windows 7 x64). I was able to shot using CTRL.
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Ah, on both cases it used almost an entire gigabyte of RAM... it seems a lot to play a 15 years old game.
