so I sat down to find a good way to import pngs with transparence in pharo and animate them and I ended up to this code morph:= AlphaImageMorph new. morph openInWorld . form1 :=Form fromFileNamed:'/Users/kilon/Pictures/box.png'. form2 :=Form fromFileNamed:'/Users/kilon/Pictures/box2.png'. [(1 to: 100) do: [ :index| morph image: form1 . (Delay forMilliseconds: 2) wait. morph image: form2 . (Delay forMilliseconds: 2) wait. ]]fork. gave me a basic animation then I did the proper thing and I created my own class subclassing AlphaImageMorphing and used stepping every 40 milliseconds (25 fps) to create an animation of 2 frames , frame 1 is image box.png and frame 2 is image box2.png. Both images are 600x600 and contain transparency. Now one morph is fine , seems to work ok and does not raise my cpu much. However when I kept adding instances of the class I found out that after 3 the animation was considerably slow down, pharo also slow down with slow response to my command , when I reached 6 instance I saw failed redrawing of the moprh which was like it was cutting pieces out of the image for a second or so and pharo interaction was quite slow. The cpu one of the four cores were up to 50%. CPU consumption is not bad at all , I compared with playing a youtube FULL HD video which was the same resolution and it was consuming 30% of the cpu. However I wonder if this the best way to do this. Its clear that there is no way with my current solution I can fully animate a big pharo window that is more than 1200x1200 without serious flickering and ideally I should not animate more than 1000x1000 for smooth animation. So is this all ? Are there any improvements I may apply ? Would Athens be faster in this case ? I did not try because Athens is using Morphic anyway so it should be same if not worse.