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Game speed issues (too fast, too slow, uneven speed)
Additional info

CHANGE VSYNC SETTING (in-game, if possible, or in driver settings)
Check if the game allows you  to enable or disable VSync (other possible names are vertical sync, vertical refresh and similar).

If there is no such setting, try forcing these settings in your graphics card's drivers. To do this, right-click an empty area on your desktop and go to
For NVIDIA cards: NVIDIA Control Panel -> 3D Settings -> Manage 3D Settings , and click “Restore”.
For ATI/AMD cards: Catalyst Control Center -> Gaming -> 3D Application Settings, and click “Defaults”.

In both cases, you shoudl experiment with different VSync settings. Different games respond to VSync differently on different systems, and the result could be input lag, visual "tearing", or reduced framerate.



CHECK IF THE GAME IS RUNNING ON MULTIPLE CORES AND, IF NEEDED, FORCE IT TO ONLY USE ONE

To do this, Alt-Tab out of the game, go into the Task Manager (Ctrl-Alt-Del), right-click the game's process, click "Set Affinity..." and make sure that only "CPU 0" is selected, then click OK and go back to the game.

If this didn't help, or alt-tabbing isn't possible in your case, there is a more extreme way to use only one core temporarily.
Press Winkey+R, type in "msconfig" and press Enter. In the "Boot" tab, select "Advanced Options", where you can set the number of cores to 1. Close the Advanced dialog, select "Make changes permanent..." and close the msconfig program. After restart, only one CPU will be used by Windows, and the game will run correctly.
To reenable all cores, run msconfig again, and untick the "Number of Processors" option in the Advanced dialog. Remember to select the "Make changes permanent" option.
Of course, you can (and eventually should) re-enable the other cores afterwards, by following the steps above, but choosing to use the total number of cores your CPU is equipped with.



NVIDIA ONLY - SWITCH TO SINGLE DISPLAY PERFORMANCE MODE
Go to NVIDIA Control Panel -> 3D Settings -> Manage 3D Settings, and make sure that the “Multi- display/mixed-GPU acceleration” is set to “Single Display performance mode.”



CHANGE POWER SAVING MODE
Go to Control Panel -> Power Options in your system and change Power Saving Mode (it may be called Minimal Power Management) to something more power-intensive. It works for processors that dynamically change their clock speeds according to the current performance needs.



TRY DIFFERENT COMPATIBILITY MODEPlease right-click the game's shortcut, go into Properties, click the Compatibility tab and try different compatibility modes.

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