How did you tweak and fix it? I suffer with Windows 11 at work and everything is just so slow. Alt+Tab often gets stuck and clicking icons on the taskbar don't register about a fifth of the time. Take a screenshot with Shift+Win+S? That's gonna take at least 10 seconds for the snipping app to even load, after which what I wanted to screenshot is probably gone. Open a tab in Explorer? Five seconds, during which individual parts of the UI update. Delete 50k files from some image analysis? That's gonna crash explorer.exe and take down the whole shell. I suppose they rewrote the Windows shell in React, and every basic interaction is a major undertaking. At home I have a 12 year old PC, with Linux and the Gnome DE. It is absurd how much faster it is, everything is snappy and instantaneous. To me, there is nothing to fix in Windows 11 - they have failed horribly.
From my experience, a computer running that slowly is out of memory and hitting the swap file constantly. The tweaks I did are in settings. I turned off widgets, OneDrive and Ads. Also there have been comprehensive scripts for cleaning Windows 11 shared here on Hacker News if you look for them.
Windhawk, O&O ShutUp10++ and a few other manual registry tweaks