MCPE 0.16.1 is extremely laggy (IN LOTS OF WAYS)

When playing on my iPad mini if the chunks are above 4 chunks it impossible to play on from lag. Also when getting on a horse you get a HUGE lag spike for about 5 seconds. When saying commands and typing it is also really laggy. Don't know if this is a bug but you can no longer leash horses while on them or equip a saddle, armour etc. while on them.

But loving finally being able to play on 0.16.0 because before it wouldn't even load up the world.

Finally, is mobs de-sawing and glitching through blocks finally fixed???

THANKS YOU FOR EVERYTHING