Clip Properties: Transport -> slow fps

[Gadg3ts]

R3.0.1
Basically, when I click on a clip, if in the clip properties the Transport panel is expanded & with the pointer moving its length in <5s, the FPS of the output goes from realtime down to <5.
Anyone else seen this?

I can get round it by making sure I've previously shrunk the transport panels for all loaded clips, but it is a little annoying and does mean I can't have any visual feedback of the transport state...
Only happens on the laptop, desktop is fine. I had to update the GFX drivers (version in sig, 182.08, Omega ones wouldn't install) to get the 2nd output working and stop that horrible static strobing.