From: getcha.2k8@... Date: 2008-12-15T10:17:42+09:00 Subject: Re: Speed up require on win32 Hello, Robert Your logs looks good. I tested again in such environment: OS: Vista Process Monitor: 2.03 Ruby: 1.8.6, 1.8.7, 1.9.0 Used the same a.rb and command line as you. I got similar results for all ruby versions: every successfull read of a.rb is followed by ~60 DeviceIoControl. I can't attach my CVS (posting from google site). How did you attach it? - Alex