Comment 26 for bug 1832812

A thousand thank yous.

Disabling 'desktop icons' from the extensions app fixes this for me.

Once disabled, even just the action of clicking on the toggle in the extensions app has the same effect, the desktop becomes unresponsive (though the mouse moves) for about 30 seconds, then finally the toggle redraws to show the extension is enabled.

Totally repeatable, with them enabled, unlock takes forever, with them disabled, unlock is instant.

This is 20.04
The 'Ubuntu Dock' extension is still enabled.