Performance of net7 is worse than net6 in WPF controls (at least)

[arivoir]

After upgrading a WPF benchmark application from net6 to net7 I noticed the performance got slightly degraded. The difference is not huge, but since it affects all the ui the impact can be big, and really unexpected.

WPFGridsBenchmark (2).zip

To reproduce the issue please follow the next steps.

1. extract the application
2. Build it in "Release" configuration
3. Run it by clicking the exe (instead of debugging from VS)
4. Maximize the app
5. Click "Run all tests" button.
6. Close the app
7. Edit "C1GridsBenchmarkUsingNuget" to target net7 <TargetFramework>net7.0-windows</TargetFramework>
8. Repeat the same steps

In the same directory as the exe there will be some xls files created by the application

Notice the performance got degraded in almost all the cases in all the grids.