Illustrator is no longer usable.

Illustrator is no longer working. This is the result of an update. When I open a file, the artboard doesn't appear initially. I double-click the magnifying glass tool and the artboard appears. I can't drag the selection tool to select multiple objects. It's incredibly slow.

I'm having trouble, but I can't post. Why, Adobe?
This really says a lot about Adobe's current situation!