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Please test with the latest snapshot (currently 1.14.4 pre 3), as there have been many performance fixes.
Still a problem

Does this occur in the latest pre-release, currently 1.14.4 pre 4 ?

Might be a duplicate of MC-133877, since they are mining wood/leaves? Or does this happen with other blocks too?
Last tested in 1.14.4-pre5 and there it still happend.
The problem occurs mainly from mining wood/leafes, so decaying leaves does make it happend a lot. Though mining any block above the surface does give a minor lag spike aswel, though wood and leaves makes the biggest lag spike.
Still happens in pre6, no settings changed
I reported it also in https://bugs.mojang.com/browse/MC-156767
Sorry for duplication
For me turning down biome blend helps a bit, but I have always played on the same settings.

In that case this would be MC-133877.
Why does it get marked as resolved, nothing solved the problem yet
Any fix for this?
Please mark it as reopened, it is not resolved
Have had the problem for about a week or two, not sure what changed.