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I work on Roslyn and would love to use Vim for all my editing but you're right -- the UI-blocking extension model Vim has just does not work.

I also have high hopes for NeoVim.

I am using NeoVim instead of Vim. It is working well, but I unfortunately cannot remember if OmniSharp worked through non UI blocking extension api.

There is plugin called deoplete[1] that is doing asynchronous code completion. It shouldn't be too hard to connect it with OmniSharp.