Tab "close" delay
Haven't seen this mentioned anywhere else, so I thought I would bring it up. I know the UI will see lots of optimization in the future, but one pretty annoying glitch is the fact that, with tabs on the right, hovering the tab does not always cause the "X" to show, to close the tab. Sometimes it's necessary to slide the cursor off the tab and back onto it again, to get the "X" to appear.
You are right, but targeting little "X" on the tabs is very inefficient. That's strain for the eyes and for the wrist. I'm using middle mouse button for closing tabs, so I can click on them anywhere I want and they still close nicely every time.