Since 1.9, massive entities in one spot (+400 for me, depends on your computer/server) cause extreme lag. To fix this, just make a 3x3 spot (or more) where will be your entities instead of a 1x1. Or kill them.
How to reproduce:
https://www.youtube.com/watch?v=Vty2f53Ocfc&feature=youtu.be
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then don't do that, the server tries to calculate pathfinding for every single one of those mobs, basically you're just asking for the server to overload
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Do the server has to calculate Boats and Item Frames pathfinding?
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Then tell us why it worked perfectly with no lags at all in 1.8, and it's awful in 1.9.
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because 1.9 has other memory issues already reported, like MC-94438
as for boats and item frames it's the rendering of them, I will reopen it, but with so many entities as one spot, you are still kinda asking for it
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Collision is the real cause. I tried to place 400 chickens in a 1x1 spot, and in a 7x7 spot and the difference is clearly here.