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+---
+synopsis: Find GC roots using libproc on Darwin
+cls: 723
+credits: artemist
+category: Improvements
+---
+
+Previously, the garbage collector found runtime roots on Darwin by shelling out to `lsof -n -w -F n` then parsing the result. The version of `lsof` packaged in Nixpkgs is very slow on Darwin, so Lix now uses `libproc` directly to speed up GC root discovery, in some tests taking 250ms now instead of 40s.