Endermen do not despawn while holding things, in my world I afk a lot around a gold farm. Basically I noticed that my performance fell way off and did a bunch of things to fix it, then I was looking around in spectator mode and saw about 100 enderman jammed into a small area. So I went to the command line and killed all enderman it killed 1043 entities. It would seem nearly every enderman that spawns picks up something (usually mushrooms). Then since 1.16 no enderman holding things despawn so it snowballs.
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However, we are already tracking this issue, and this report is a Duplicate of MC-191725, which is a report that has not been resolved yet.
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After killing all enderman my fps went from 30 - 60.