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Even though Wezterm has lots of options but it's slow compared to Kitty and maybe even Windows terminal

Yep. Tried Wez and switched back to Kitty because it’s much faster.

on which platform?

Windows. Didn’t test it on my MacBook M1. Both running nvim with the same config.

macOS for me. Zipping up and down a buffer is noticeably faster (drawing/render wise) in the latest Kitty compared to WezTerm. Using 2019 Intel MBP