FROM: http://vampiroz.org/2007/05/mutt-mailbox-vs-maildir.html Are you using Mutt and wondering whether it’s better to use mbox (mailbox) or maildir for mail storage?. I hope this post will help you decide. p. Here I publish a simple benchmark results of the time it takes mutt to read/open a folder with 28.000 emails. First, some notes about the tests: software: mutt 1.5.13 compiled with +USE_HCACHE running on a Debian 4.0 server (2.6.18 kernel) hardware: 3.2 Ghz Pentium 4 with 2Gb of RAM all this values are averages all these tests are taken with disk buffers active on RAM all numbers are averages times Using mbox real 0m1.920s user 0m1.808s sys 0m0.112s Using maildir without header_cache real 0m2.599s user 0m2.092s sys 0m0.508s Using maildir with header_cache real 0m0.884s user 0m0.732s sys 0m0.152s Conclusion Based on these results, it seems the better choice is to use...