Issue #5767 has been updated by Luis Lavena. For those interested here are some raw performance numbers and comparison between default (no patch) and other patches combined: https://gist.github.com/1490555 ---------------------------------------- Feature #5767: Cache expanded_load_path to reduce startup time https://bugs.ruby-lang.org/issues/5767 Author: Yura Sokolov Status: Open Priority: Normal Assignee: Category: Target version: This patch add caching of expanded load path. It reduces rails startup time by 33% (patch against 1.9.3-p0 and simple performance test is here https://gist.github.com/1480404 ) -- http://redmine.ruby-lang.org