It's a particular choice of terminal, that. I can't help wondering how quick it would be with urxvt or similar. I'll probably pick one up in a few weeks to find out myself.
On the Android side there are faster launchers and faster terminal apps as well. Loading fully-featured, touch-friendly apps just takes a while on hardware like that.
I've run postmarketOS on an old Galaxy Tab II back in the day and that had similar (though much worse) issues. You can open minimal applications quite quickly, but the on-screen keyboard doesn't open and trying to things like scaling are likely broken.
