the gnome tuba app (mastodon client) is unusably slow on pocket reform with imx8mplus and it has to do with background paint/fills in the timeline. the CSS in my screenshot increases the scrolling speed from what feels like max 5 fps to 25fps and stops cursor stuttering. i wonder what's going on cc @rmader
btw you can inspect and mess with any GTK app by pressing Ctrl+Shift+D
@mntmn advice: do not try this with gnome-terminal