Neovim isn't immune to slow plugins, it's just a smaller ecosystem and therefore has less exposure.
My two cents, I've never seen a case of "VSC is slow" that isn't user error in this vein or on codebases that don't struggle similarly with similar tools. Ex, if clangd is struggling with your million file codebase under VSC it doesn't somehow become more responsive under Neovim.
And ya, anecdotally, I've never seen input latency specifically move an inch. The VSC team lives and dies on input latency and it shows in the current product.
My two cents, I've never seen a case of "VSC is slow" that isn't user error in this vein or on codebases that don't struggle similarly with similar tools. Ex, if clangd is struggling with your million file codebase under VSC it doesn't somehow become more responsive under Neovim.
And ya, anecdotally, I've never seen input latency specifically move an inch. The VSC team lives and dies on input latency and it shows in the current product.