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wbolster/emacs-direnv uses an approach that mutates global state, allowing a direnv to bleed into unrelated buffers and contexts. For this to work it must rereads the direnv every time you switch buffers, which can be very slow. purcell/envrc, on the other hand, makes env state buffer-local, so the direnv only needs to be read once, when a is first initialized. This is faster and less error prone. However, it's necessary to manually reload the direnv if you've changed your .envrc outside of Emacs (with `M-x envrc-reload` or `M-x envrc-reload-all`).