François B

There is also big lag issues with collisions in 1.9. When several entites collide in a 1*1 spot, it generates a lots of lags. Ref : MC-100692

Then tell us why it worked perfectly with no lags at all in 1.8, and it's awful in 1.9.

I don't know if it's relative to this issue : MC-94438. However server lag is a massive issue in 1.9. My server log is also spammed by this "Keeping entities".

coordinates not divided per 8 only in gamemode 0 (works in gamemode 1)

"Works as intended" means that it's a feature. "Won't fix" means that's it's not necessary wanted like this but it will stay like it is.
At least on my mind.

Anyway, I've found a way to make an enderfarm with a very high spawning rate in 1.8 snaphots (no pressure plates and no endermites).

Seriously, more than a half of the most involved players use farms to improve their gaming experience (mostly youtubers : the two last comments justify it).

If there is a good reason to upset those players, can we know about it ?

Please make it a bug instead of a feature. It would be so please from you. This typical behaviour is really usefull.