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This guide will help you solve an issue with the bug that locks the game to a 60hz refresh-rate on a 144hz screen even after you disable the V-Sync in the display settings.
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Mafia Definitive Edition is a remake of the original Mafia game from 2002, and it is a gorgeous-looking game. As soon as you start (re)playing this masterpiece, you'll be amazed by the wonderful graphics upgrade of the 2020 remake.

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But, as with many PC games, it's not without some issues. 

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The first and probably the biggest one that will get in your way is the V-Sync issue. Apparently, the game locks into 60hz mode even if you disable the V-Sync in the Full-screen mode. 

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There is no Refresh rate option, just the Screen mode, V-Sync, etc. If you have a G-Sync or FreeSync compatible monitor with a 144hz refresh rate, you'll most certainly want to disable the V-Sync and play with the highest frame rates possible. 

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So, what you have to do is this:

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• Go to your desktop and Right-click on the Mafia Definitive Edition icon (.exe) 
• then click on the Compatibility tab, 
• then click to enable the "Disable the full-screen optimization" option.

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That's it.

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If the shortcut is not on a desktop, you can find it in the Steam folder: Steamapps, common, Mafia Definitive Edition. 

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If the "Full-screen optimization" does not solve it you can try with this:

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Open Nvidia control panel > Manage 3D Settings > program Settings > find Mafia Definitive Edition there or add it by yourself > then scroll down to refresh-rate and set to "Highest".

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You can also set the game to Borderless (Full-screen Off, Window Borders Off) mode and you'll solve the issue this way too, but for some gamers, the Windowed Borderless mode is not an option.

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Go to the game and make sure you are using these settings:

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• Full-screen mode On
• Borderless Off
• V-Sync Off

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This should help your display to achieve 60+ fps and you can enjoy this remake of the classic crime drama in the smoothest way possible.

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Original Source: https://www.altchar.com/guides/mafia-de ... tEx2n4B6aa

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[See the full post at: Mafia: Definitive Edition - How to fix 60hz lock on a 144hz monitor]