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Specs
CPU: AMD Athlon X4 860K
Ram: 16GB
GPU: GTX 1650 OC
On my raspberry pi 4 with retropie it is not laggy
why is my pc laggy
its more powerful than rpi4
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40fps
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because your windows desmume defaulted to softrasterizer whereas the rpi used opengl renderer, or because your GPU is broken or the drivers are bad. check your 3d renderer settings and upgrade or downgrade your gpu drivers (and change config > display method)
also the rpi probably had dynarec turned on by default and Windows version may not. config > emulation settings > use dynamic recompiler
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