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When playing Mirrors Edge the framerate drops until it is unplayable and runs at 1-2 FPS. At all other times it's fine, and opening to the main menu and resuming resolves the issue, as does quitting and then returning back to the game. The most recent time is when I've got to Ropeburns Office and I'm climbing up the waterfalls, I jump across to the balconies and when I get shot at the frames drop to next to nothing.

I'm running on a quad-core AMD 2.8Ghz with 8GB of RAM from a OCZ SSD and a ATI Radeon 7870 Core graphics card. I didn't have any issues when playing on my laptop - Dual core 2.0Ghz Intel with 4GB RAM and integrated graphics.

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sounds like there's something else going on with your desktop that's the issue, maybe a background process? Does this happen with any other games? – l I Jun 25 '13 at 12:08
It's just Mirror's Edge I've noticed the fault with. – Fun_Police Jun 25 '13 at 12:12
Yes, when Faith is being shot at there is a lot of breaking glass. – Fun_Police Jun 25 '13 at 12:19
up vote 13 down vote accepted

It's likely to be an issue with NVidia's PhysX engine. I had a look around and it's noticed that PhysX does not play well with a lot of ATI graphics cards.

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I had the same problem and after a bit of searching I found that this works on my XFX radeon 6870 card.

go to options > video > and disable PhysX

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