Whenever I try and uncap Powerwash Sim to 90fps (it locks to 45fps by default) it doesn't seem to work. Any ideas ?
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Powerwash Sim uses a technology called Asynchronous Space Warp (ASW).
The game internally runs at half the visible framerate to improve performance. To see your actual framerate, you can set the OVR Metrics tool to "Advanced" and check "ASW FPS" - you're actually getting 90 already!
If you want to push further, you can always target a higher framerate :)