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→Problems and Solutions
If it happens on all cores with a clean config file, then try changing <code>video_driver</code> setting from <code>gl</code> to <code>d3d</code> or <code>sdl2</code>, if you have a particularly ancient GPU.
===Performance issues while using the GL driver===
Nvidia users may find that even while idle, RetroArch CPU usage is upwards of 12% or above while using the GL video driver. If this is the case, go into the Nvidia Control Panel, and under Manage 3D Settings, check to see if the Threaded Optimizations option is set to Auto or On. If so, add retroarch.exe to the list of programs, and then toggle it to Off. This should lower CPU usage drastically.
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