[2022] Game freezes and stutters all of the sudden

Hey everyone,

I have played Anno for a few months a while back (I'd say 6 months ago). Haven't touched the game since.

Today, I wanted to get back to playing but all of the sudden the game is unplayable. As soon as I load the game everything stutters, freezes and occasionally crushes.

Menu is ok, no issues there, the problem happens as soon as I load a save.

I tried:

• Creating a new save from scratch
• Playing around with graphics settings, switched from Custom to high, then to low.
• DX11 stutters even in the menu, so I reverted back to the original setting which was set to DX12
• Verified game files
• Updates drivers for my GPU
• Updated Chipset
• Updated BIOS
• Reinstalled the game

I have a Ryzen 3600 and an RTX 2070 Super. I'm not sure what to do anymore.

Here's an example of how it looks in my game.

The only thing I can think of that was changed since I last played the game is that I upgraded to Windows 11, but surely a company like Ubisoft already optimized the game to run on practically the same OS?

Any help would be great

Edit
Found a weird thing. When I focus on my other screen, or practically anything else than Anno, the game works smoothly in the background.
Here's a clip: 2022-04-08 12-10-03.mkv (streamable.com)