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Locate the game NFS14.exe file. Usually, it’s located in your Origin library (C:\Program Files (x86)\Origin Games\Need for Speed™ Rivals\)
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Create a shortcut of the exe file by right-clicking it > send to > desktop (create a shortcut)
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Right click on the shortcut, and then click on properties.
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In the target field, add the following code at the end (after the " quotation mark)
-GameTime.MaxSimFps 60 -GameTime.ForceSimRate 60+
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Launch the game from the shortcut
 
Known issue
Whenever the frame rate drops below 60, you will experience "slow-mo" mode