Generally the smoothness at high TC is related to how many units are close enough to you for the SH3 engine to be a bit more precise about what they are doing - its the exact range is 32km from you IIRC. The AI of anything outside that range is very simple, anything inside that range is "cleverer". So, its normal to struggle at high TC when close to any port...
But I've never had any noticeable slowdowns at below about 64x TC. How much ram have you got? What is your HD doing, is it mainly idle or is it grinding away? If SH3 has used all the available ram and is paging to disk then that will completely kill your framerate.
If your HD is very busy, then make sure you shutdown all other apps before you start SH3.
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