Yes I suspect filters are not cached or something… it looks like they constantly reprocess when you navigate around the composition. Painting itself is smooth but selection/layer transformation and (sometimes) navigation have some room for optimisation I guess

Thank you for the kind feedback

Yes .kra is the regular Krita extension it’s the equivalent of .psd for photoshop

What I guess the deck could be ideal as is a little sketch pad… for that purpose maybe I’d try MyPaint, it has a simplicity that I think would mesh well with the small format