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I recommend looking into Kitty. It is also GPU accelerated, and comes with its own programmable windowing + tiling system. With some configuring I was able to ditch tmux.

https://sw.kovidgoyal.net/kitty/

I actually use Kitty with tmux/vim. I noticed a massive improvement in rendering speed over iTerm. This was after messing with iTerm's own accelerated rendering which wasn't as much of an improvement as I had hoped.

You need to also download "winpty-agent.exe" from the releases page.

See this for more context: https://github.com/jwilm/alacritty/issues/1818