I've heard it helps, but there isn't a heck of a lot of well documented test data out there. Easiest way is probably to use double sided tape and apply foam sheet to the mechbox before installing it. Keep the foam off of the hardpoints which register to the body.
You shouldn't see an fps decrease until wear out your nozzle or lose piston teeth. You'll get a lot of pseudoscience on this issue. I don't think springs lose much energy storage with age, but I haven't done lifecycle testing to say for sure. A lot of players will tell you that they observe measurable spring creep, but not many of us own our own chronys or try comparing old and new springs of identical rating in a new AEG.
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