I don't think so. To my understanding, 7.1 is basically a bugfix releasee of 7.0.x, and as such should perform about the same. It might be a little more demanding on the RAM, but that's probably because it adds a few new features (I think 7.1.x introduced systemwide AppleScript, and the System Folder included the Fonts folder for the first time, rather than stuffing them inside the System file itself).
Someone chime in if I'm wrong about anything!
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