I talked about this in the OP. Memory maps are sometimes a little faster. See: $ ls -l full.txt -rw-rw-r-- 1 andrew users 13113340782 Sep 29 12:30 full

I talked about this in the OP. Memory maps are sometimes a little faster. See: $ ls -l full.txt -rw-rw-r-- 1 andrew users 13113340782 Sep 29 12:30 full.txt $ time rg -c --no-mmap Clipton full.txt 294 real 1.337 user 0.470 sys 0.866 maxmem 15 MB faults 0 $ time rg -c --mmap Clipton full.txt 294 real 1.045 user 0.722 sys 0.323 maxmem 12511 MB faults 0 But in recursive search, especially when used for lots of little files, they end up provoking substantial overhead that slows everything down. And this might change depending on the platform.