I have tested on 32" 4K and 27" 4K and there was no performance issues.
Slight degradation on Dell 42" 4K, could be because of the ppi or the pixel ratio, which might be causing canvas/row/cell/ dimensions to be not rounded to whole numbers (this can affect perf).
Slight degradation on Dell 42" 4K, could be because of the ppi or the pixel ratio, which might be causing canvas/row/cell/ dimensions to be not rounded to whole numbers (this can affect perf).