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You could try reverting the changes. For example, i update my Windows 7 to service pack 1, install Java 7 and then install latest video drivers; the result of all those software update was a speed boost on almost games.
To found the source of that boost i try one by one until i found that Java 7 work better for me than Java 6.
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Are you sure you revert completely the OS to when it ran the game at 30FPS? And, are you playing the same game or the FPS result comes from another one?
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It could be a lot of things, I think. The way to find out is for you to try to remember EVERY single thing you did before the actual slowdown of jpcsp. Share it with us.