Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.85.2, x64.
• OS Version: Fedora Linux 39 (Workstation Edition), Wayland, AMD GPU.

Steps to Reproduce:

1. Open 2 VSCode windows (maximized).
2. Open the first one, then switch to the second one. It will be unresponsive for 1-2 seconds.

Demo video:

Happens only with 2+ VSCode (or 2+ VSCode Insiders) windows. If I'd open a VSCode + VSCode Insiders - it's fine. Switching between different apps (VSCode + Firefox, for example) is also fine.

If I don't maximize windows and keep them in window mode, it's fine:

What I tried and it didn't help:

• Install VSCode Insiders. The same happens with 2 windows of VSCode Insiders, but not if one is VSCode and the other is VSCode Insiders. But it's not optimal because something will still lag with 3+ projects opened.
• Disable hardware acceleration.
• Disable all extensions.