I mistakenly put this in BDS - it is CLIENT SIDE from what I can tell. I created a new Jira Ticket and this one can be closed.
I'm currently on the 1.16.201 version of Minecraft on Windows 10 and still experiencing some pretty bad CPU usage numbers. It's averaging between 60-80% when idle in game, not loading chunks. Aside from my computer getting really hot when just playing the game, adding streaming content to Twitch into the mix makes the video extremely choppy because Minecraft is hogging all of the CPU resources.
Specs.
Dell G3 15 Gaming Laptop
Core i5 8th Gen
GTX1050 GPU
16 GB RAM
M.2 System Drive, SSD Storage Drive
Want to clarify...this does not work in Survival but does in Creative Mode.
I am having this same issue. I have a texture pack that only changes the anvil textures, and it made the sniffer egg and sniffer invisible. Would love to be able to use my textures without it affecting vanilla features!