Can't answer your question about performance, but regarding torpedos-
the torpedo cam is still in there, you have to check in the realism settings before you leave port to check that its enabled. Though it doesn't always pop up, seems kind of random to me.
As for the torpedo tracks, thats a well known problem that might be addressed if ubisoft deem us worthy of a 1.3 patch. Otherwise, Ducimus' 'Maru Trigger' mod fixes it apparently, you can find that on the forum somewhere with a search
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