As the name suggests, allow more than one thread to render a frame, or render a frame on each thread. On high and low powered cpus, this would be the cherry on top for performance - all performance benefits, than quadruple or more the frames for each thread on your PC. I bring this up because I have an AMD Ryzen 7 5800h with 8 cores / 16 threads and an Nvidia RTX 3070 mobile GPU, and the entire bottleneck is the CPU - one single thread is slowing down the entire game. I have heard it cannot be done with the way Minecraft is coded, but if you could at least look into it, that would be great! Thank you.

Uh I'm not sure if this is possible on opengl

i dont think thats possible in minecraft unless you rewrite it

No. It's not happening.