Steps to reproduce
Launch Minecraft from Launcher
Create new world
Join new world and wait for fps to stabilize (60fps - vsync)
Press esc to open pause menu
Notice fps drop to 1-2 fps with great lag and a few seconds before the menu opens
This also reproduces on all UI menu elements like chest, trading, and utility blocks eg. crafting table, stone cutter, etc.
Environment
Minecraft Java edition (Fedora 32, x64)
Java versions : launcher default/openjdk 1.8/1.11/1.14
Linked issues
duplicates 1
Comments 3
Added a video showing the lag.
Duplicate of MC-178267
Please provide a screenshot of this occurring with the F3 debug screen enabled.