Happens with Konsole sometimes on an 8th gen i7. This cpu can run many instances of intellij just fine, but somehow this TUI manages to be slow sometimes. Codex is fine, so no good argument exists really.

I'm using it on Framework Desktop 128GB RAM... Its scroll is utterly broken outside of VS Code for me, on Gnome Terminal, Tilix and a few others.

And even in VS Code, it wonks out after a while.

My guess is that it mostly works on Apple devices.