Amnesia Slow and Jerky graphics

[TheBlastPassage]

Try validating the game files. You can do this by right-clicking on the game in your Steam library, clicking on properties, going to the local files tab, and then click "Verify integrity of game cache" it will validate all Amnesia files and re-download any corrupted or bad files.

Let me know if that helps

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UPDATE: As it would seem, Amnesia is having trouble loading lights. This could possibly be fixed by validating the game files