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Got this glitch too last year, found a solution by myself. It is not depend on version of the game - bought it on Steam yesterday and still need to reduce MRR to 125 Hz (Mouse Report Rate, as told by Oscar Editor for my X7 mouse). Now just a little buggy, only noticable when 3D sound option is on. Suppose 100 Hz is the ideal solution. Anyone got PS/2 mouse?
I dunno if Starbreeze can patch it after all this years...
It's due to your laser mouse (pretty much all gaming mice these days). Plug in an optical mouse (one with red light underneath) and it'll be fixed.
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SparkTR: It's due to your laser mouse (pretty much all gaming mice these days). Plug in an optical mouse (one with red light underneath) and it'll be fixed.
You mean LED mice (also: laser mice are optical as well).
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atercrest: I had the same problem and could find no solution for the problem anywhere and that is why I am posting on this old thread. I finally figured out that the problem was related to the polling rate on your mouse. If it is any higher than 125Hz it causes the game to speed up when turning with the mouse.
Thank you, that solved the speed problem for me. Now I can finally play this game.