Disclaimer: As of writing this, it is impossible to get 90fps in-game, that functionality will be included in the next update. I have the quest 2 compatibility as I am currently using a test build. So if you are on 5.8 or lower, this wont change your FPS.
Plug in your Q2, and make sure the light in the top left corner of sidequest is green.
In the top right, click on the wrench icon, it will open up various settings for your headest.
Scroll until you have found the setting "Refresh Rate". Then select 90hz.
Power on and off the Q2 by using the power button. This will have reset the display to run at 90hz.
Open Hyperstacks on your Q2, then navigate to: Menu > Experimental Settings > Show FPS. On your hand you should see the FPS. if the number is between 60 and 80, than you either are on an old version or made a mistake when following the tutorial. But if it is working, you should see the fps go all the way to 90.
There you have it! You can now play hyperstacks or any other quest game that supports it in 90fps!
