As of 2.1.7, on a Galaxy Tab 4:
Noticed this first time I played 2.1.0, just wasn’t sure if it was my imagination or not. Enemy buff/debuff icons seem to be causing a huge performance hit, somehow. Enough of 'em at once, and they hurt the control response.
Game load times, hell yes, whatever you did there reduced load times by nearly 80%. And realms came out even better, with a nether realm loading as fast as a boss level used to. Nice work.