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The issue is not resolved for my config M5Pro 18 CPU / 20 GPU - 48GB + Studio Display XDR - macOS 27 RC (09/09)
oh no, it stutter again after I reboot system, idk what happened make it so smooth when it update to RC from beta8 , but once I reboot system again , it back to used to.
 
in my external monitor,at 120hz mode window moving and scrolling is running at full 120hz, sometimes moving window is stutter but it less than beta 8 a lot , scrolling is always running full 120hz very smooth, keep feedback to apple and make it optimization
Maybe there is more data to render with the Display XDR, I don't know. There might be a slight improvement, but not sure. It still makes a big difference when I run the "M5ScrollBoost" test app to keep the GPU active. I had an appointment at the Apple store yesterday, we reproduced the issue and created a ticket. Will see if it can at least be reviewed and acknowledged.
 
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