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This is in fact fixing a massive pain point in vim, and one of the main reasons why NeoVIM has so much support. Saving a file in vim takes 1-2 seconds for me. Not because my disk is slow, but because I run some linters on my files, that take that long to all complete.

Async I/O is not about disk I/O, but communication with other programs.

This is mostly about linters, makeprg's and things like Ctrl+P / Command+T, git-gutter etc.

I recently switched to NeoVim and it really _does_ make a world of difference, saving is a whole lot faster when git-diff can be performed asynchronously and the ability to scan directories in the background makes fuzzy searching of files a lot faster.

I've opened 5GB files in Vim, on an average 2010 Ubuntu desktop. It took some time, like 5 minutes, but it worked.