When I break some blocks in the 17w50a-18w01a snapshot the fps is going to decrease.
1. Create new World.
2. Break blocks very fast.
3. The fps is low.
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Hm, can't make out a noticeable FPS increase.
Maybe duplicates/relates to MC-123584?

Duplicate of MC-123584. Please go and upvote that ticket instead.

This bu report is more likely duplicate of mine... MC-123263