Ever since the update Firefox has been taking at least 10-15 minutes to load. The when it does finally load, I can't always get a webpage to load...at least not for another 10 minutes.

I restarted the computer, cleared the cache and cookies, disabled all extensions...nothing helped. This happened the last time Firefox updated. At the time I just stopped System Mechanic from interfering and it worked easily again. This time it isn't System Mechanic, it doesn't seem to be the extensions....what now?