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What I need a fast/performant way to open any file under a large ( git ) repo (~9.8k files). Context I have tried various solutions, like Textmate.el and find-file-in-repository . I found these solutions via previous SO questions like this and this and through the LocateFilesAnywhere EmacsWiki . While both solutions work wonderfully for small-to-mdeium repos, in this case they are practically unusable. When I start typing a filename, there's a delay of several seconds before I see any result. And changing any part of the search is very laggy too. I think the main problem is that on typing any character, emacs / find-file-in-repository starts a shell command ( git ls-files... ). I really only need to do that when I have stopped typing. Questions is there a better library out there for this use-case? if not, how can I introduce a delay into the command when I'm typing? i.e. while I'm in find-file-in-repository , I want the find-command to be invoked only when I stop typing (let's say a gap of 300ms).

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