I’m using 4.13.0
I believe the frame rate is fine (a GeForce GTX 970M)
Also, with sub-stepping, frame rate should not affect the simulation as much.
There are no other physics constraints.
Note that I re-built the plank from scratch again, and still had this problem, so I’m surprised if you wouldn’t see it.
I will do a recording of building the entire thing from scratch and see how that goes.