Framerate issue on power station

[whatever900]

As soon as I start the power station level for requiem, the framerate goes really low and the game becomes virtually unplayable. I am running OS X 10.5.8 and playing the collection. I've played through the other two penumbra games without any issue. I tried patching the game but that did nothing. Please help - I want to finish this game! Thanks.

[BlueFury]

Reinstall the game, reload previous saves or ask for a save past the area.