It seems my Internet is quicker after the upgrade, but that may be due to some other reason such as the clean install (or maybe I've fallen to placebo). I've been using a range extender on the other side of my house connecting to not-so-great Knology Wi-Fi. I want to say that the overall experience is smoother than Lion, but I'm not sure I recognize any areas where the OS is noticeably faster. To be honest, I wouldn't have bothered with Mountain Lion (at least not right away) if it weren't for Airplay, Notes/Reminders sync, and notifications. Mountain Lion definitely has more to offer if you've got an iPhone and an Apple TV.
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