I think DisableSolarium has no effect anymore. At least I can't see any. I'm in macOS 26.0 (25A354)
Works for me. 26.0.1 (25A362)
this helps even iphone
https://tidbits.com/2025/10/09/how-to-turn-liquid-glass-into...
I really don't like what it does to certain transparent drop downs for certain apps as well as the control center.
But It does seem nice to do it on a per app basis (ie "defaults write com.apple.finder com.apple.SwiftUI.DisableSolarium -bool YES")
https://tidbits.com/2025/10/09/how-to-turn-liquid-glass-into...
This gets rid of the slow animations, inconsistent window cornering, and other annoyances.
Then (so menus aren't transparent and unreadable): System Settings > Accessibility > Display > Reduce Transparency
If you do those two things your machine should look and feel normal again. I've been running an M1 Max since 2021 and Tahoe was simply a disaster. Removing the glass layer made everything feel good again.
If for some reason you ever want the bad performance and glass back, you change the YES to NO in the Terminal command. Maybe someday it won't suck.