Based on how the previews of the presets are rendered I am guessing Darkroom tries to pre-apply those presets. Either way, the app just crashes consistently when I scroll through those presets. I am editing on a 13 inch M4 IPad Pro, and the RAW file is 120MB+ 60M pixel from Sony A7RIV. I’d suggest to at least provide an option to disable those pre-rendering to avoid crashing the app.