I would upgrade without a doubt. Just clone your current setup to another drive, then download and install ML. If it really is that slow, then it should be an easy fix to bring it back to SL. For $20, I think it's well worth it.Keep hear a lot about how slow mountain lion is thinking about staying with snow leopard till apple fixes this problem what do you guys think
This.I don't upgrade just for the sake of upgrading. I only upgrade if a newer version of Mac OS X offers something I want or need that my current version doesn't provide, or if I buy a new Mac that comes with a later version. So far, I haven't seen anything in Lion or ML that I want or need, so I'm sticking with Snow Leopard for now.