Nope, I just have an integrated Intel GPU.

I'm also pretty much always plugged in. It's likely that the issue was manifesting before switching to a 4k monitor, but after switching the issue became unbearable. E.g I'd wait 2-3s to switch between windows or desktops. Running both screens on native resolutions and I'm switching between windows near-instantly.

¯\_(ツ)_/¯