High time outs required during mesh refinement iterations
I could get a p=9 243^3 Euler scenario run (64x14 ranks) but only if I set the timeout to a large value of 360 sec. Issue presumed to be related to imposing initial conditions on-the-fly during the grid setup iterations.
This would explain the worse behaviour in 3d as well as for the limiting ADER-DG solver. For the latter, also the min and max is computed on-the-fly.