I've noticed 1.16.1 has been giving me a weird block lag issue, as well as eating memory. I turned off all the things that could create an issue with lag, the only one being a mob farm I just built, but that didn't help with anything.

The game didn't crash on me. The memory is very quickly climbing from 40%-80% then once it hits 80, it goes right back to 40 and proceeds to climb again.

here is a link to a video showing the issue. And it shows the weird piglin going through portals like crazy which I need to make another bug report about

https://youtu.be/46t9GIU_9Oc