I captured extreme lag in minecraft 1.16 with RenderDoc. I am getting drops down to 6 frames per second. Sometimes even 4fps. The uploaded file is created with renderdoc and you will need renderdoc to read this.

Recurrent bug:
Incorrect API Use - High - Undefined - 0 - No vertex shader bound at draw

There is about 400+ GL_ARRAY_BUFFERS on one capture of lag alone