One of these tweaks is very surprising.
Like most modern games... Just Cause 3 launched with a number of performance issues caused by poor coding. Most of those issues will require a graphics card patch, while other issues can be fixed by following the guide below.
Start Steam in Offline Mode
The launch version of Just Cause 3 has poor coding that stutters periodically whenever Steam has access to the Internet. You can start Steam in offline mode to fix that issue by following these steps:
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Launch Steam.
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Click on the Steam menu and click on Go Offline.
Steam will restart in Offline mode. To go back online in Steam follow these steps:
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Launch Steam.
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Click on the Steam menu and click on Go Online.
Turn Off VSync
Some users reported their frame rate fluctuated between 30 to 60 frames per second with VSync on vs. a constant 50 frames per second with VSync off.