tidal holly
I know that this is an issue with minecraft but they apparently won't fix it 
(https://bugs.mojang.com/browse/MC-96853)
The main premise is that entities that are scaled up in blockbench (for ex) will disappear when the source block is out of view. This is expected from normal entities, but with the recent rise of custom models on multiplayer servers, it's becoming quite annoying. Both item frames and armor stands are the main issue here.
My idea is to add a switch in performance tab to allow the use of different entity culling presets/algorithms.
torpid remnant
untold rose