After upgrading VM guest to MacOS 15, the OS freezes while scrolling any window for 2-3 seconds at a time, randomly, then unfreezes.

[pcallahan-r7]

Describe the issue
I have a VM that was running MacOS 14. It was healthy and had no problems. I upgraded to MacOS 15 and this freeze-on-scroll behavior started. Any window seems to trigger it - Safari, firefox, settings app. The entire OS freezes for a couple seconds and then unfreezes.

It's not just the window that's being scrolled, because other windows such as terminal log tailing will freeze, too. VM has plenty of memory and disk space. I even tried increasing memory, but activity monitor shows the OS is no where near using all the allocated RAM.

Configuration

• UTM Version: 4.5.4 (100)
• macOS Version: Host: 14.6.1, Guest 15.0
• Mac Chip (Intel, M1, ...): M1, 64gb host

Logs
I've looked through the logs, and the only suspicious entry is this, which is repeating over a hundred thousand times:

WindowServer   Timer delayed by 77963.96s
WindowServer   Timer delayed by 77963.96s
WindowServer   Timer delayed by 77963.96s

Note the value is always the same unless I reboot.

Let me know what other logs that might be helpful. system.log didn't have anything notable.