https://youtu.be/M7u1ZqXk4qw
Normally meshmap gets 144 calls when character teleport to open field, or some other number in not so open field like caves, and + 5 calls each time character moves out of his "own" mesh square. However if you walk around 1-2 minutes, at some random point (likely random minimap boarder cross) client goes nuts and start calling it infinitely. If you start moving again it keeps spamming until at some random moment stops. If you dont move it never stops. Getting into this loop usually takes 1-2 minutes of wandering around, I recreated it 3 times just during record attempts.
For my PC this is also how game micro-freezes on all basic and custom clients appears.