Lots of falling items resulting from blocks being broken at the same time cause FPS drop

with around 1500 of any items/blocks/objects falling you generally get ~0-30 FPS 

Steps to reproduce: /fill ~10 ~10 ~10 ~ ~ ~ enter item/block/object

Observed results:

7fps in gif or mp4 of test with saplings(is ~ same for any item/block/object)

Expected results:

around ~30 FPS (should perform approximately the same as chests)