rmux is much faster than tmux or zellj, I did some internal benchmark and it's promising. rmux is a multiplexer engine, meaning that you can rewrite entirely zellij using rmux.. I created a mini zellij in a few hundred lines of rust. You can check the demoes on the repo

I don't get it as well, everything mentioned in the readme is already trivially possible with tmux or zellij

I mean, the obvious immediate answer is “windows”, which tmux flat out doesn't support (except via WSL and a shared mount).