I tried asking this on the Adobe forum and didn't have any luck so I'll give it a shot here. I play a Flash game over Safari. Upgraded my Macbook Pro to Mavericks from Snow Leopard and then had huge frame rate issues with Flash Player not only with this game but with videos. So deleted my hard drive, reinstalled Snow Leopard and it still isn't getting the same performance that I had before upgrading to Mavericks. I use low quality on Flash settings, without hardware acc, and I allow unlimited storage. I don't have any extensions or autofill on either. Is there anything in terms of firmware that is changed when upgrading from Snow Leopard to Mavericks? Or any settings I'm missing because its not running like it did prior to the upgrade.