After the update I'm receiving very bad fps drops due to a suddenly increase of the GPU use. It goes from an average of 40-60% to 100% use with no reason apparent when I play the new dungeon or I'm messing around the Cosmodrome.
I play on laptop, MSI Leopard with a 1050ti with which I usually get around 40-60fps on High.
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Check the temps, the system may be throttling down to avoid overheating.
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I think there is something else wrong because there is nothing wrong getting 100% gpu ussage you want the gpu ussage as high as possible Maybe try a fresh gpu driver using ddu display driver uninstaller and make sure you're on the latest driver version