Just as a note about the Android version (cowtastic_1.0.0.24_2) - I gave it a try on an Android tablet knowing it could have issues, and didn't have any notable issues at first.... though it does start stuttering the further along the game goes.
I would have expected it was related to her size/max size (graphical/animation related), but it seems more tied to either Production or "Milky" mode.
First Normal run up max size with about 12ml production at most, and not much issue.
Second run on Normal + Milky mode, and stutters were increasing as time (and production) ran on.
I may try another run on Normal, going for high production without Milky mode and see if it behaves the same.