Dragging a node is very difficult now on my Linux machine, since about a week ago. Nothing changes under the mouse I while I'm dragging the tab, and then when I release it, Tabs Outliner is frozen for about 10 seconds, then finally moves the tab.
I have 15,287 nodes, so I don't know if this is related. Luckily I am still able to move things around with the keyboard shortcuts for now.
Customer support service by UserEcho