By design, Selenium makes a new copy of your Firefox profile each time a new test is run. I find this copy time is a considerable bottleneck, especially when running 100s of tests. (5-15 seconds to copy the profile a new).
Does anyone know of any overridden behaviour for this? I'd prefer my Selenium server to just reuse the same firefox profile. I know this violates the "cleanly set up your test fixtures" philosophy, but it's a shortcut I'm willing to take, as my tests don't materially alter my firefox profile enough to jeopardize future tests.