If you're getting really, really bad performance, we want to find those problems and fix them quickly. Like if you're getting 40fps on Live and 8fps on test, that means something is definitely wrong. First, make sure you have GPU particles turned OFF. Second, make sure your settings are the same as on Live. If after those two steps, you still get terrible performance, please reply here with your CPU, GPU, and OS (and anything else you think may be relevant). We also are aware of a problem that seems to randomly crush SLI users. We're working on that one, too. This is why we Test.