Switch to scissors and try playback with ‘Stationary Cursor’ enabled.
Try a longer project ( 15+ minutes )
Also depends on zoom level.
I also found the strength of the jerking, depends on the content on the screen.
As long as there are many events, everything is smoother.
When I scroll down, to where mainly group tracks and FX tracks reside,
it gets rough even without scissors tool.
I was just having the same problem. Scissor tool in a MIDI track lane with moderate zoom makes playback cursor sluggish. I never noticed that before. Probably need to investigate more, but the sluggishness is definitely there.
Well … the Grid Overlay is the ‘replacement’ for Transparent Events, which is missing since v 6.0.0.
So, at least for serious audio editing, it has to be on.