I guess it also depends on painting style.
If you use big airbrush, it eats ram massively. Right now I was adding kind of glow effects with airbrush and had short freezes while canvas dragging. Checked Artstudio -> Send Feedback: 1.8 ram was full and also swap was close to 1 gig.
I was curios and played with new document: 1 layer, small 2800x2000 canvas.
Airbrushing ate 750 mb on 20 undo step backs in Settings.
Airbrushing ate 1380 mb on 50 undo step backs in Settings.
Airbrushing ate all 1800 mb on 100 undo step backs in Settings. Also 750 mb in swap. App has freezes at this point.
Now, lets check 7500x5600, 1 layer.
Airbrushing ate all 1800 mb on 20 undo step backs in Settings. Also 150 mb in swap. Here are short freezes.
Airbrushing ate all 1800 mb on 50 undo step backs in Settings. Also 2300 mb in swap. Strong freezes.
Airbrushing ate all 1800 mb on 100 undo step backs in Settings. Also 4400 mb in swap. Very strong freezes.
But no crashes
