MD5 is a perl module for encryption, I am not sure if changing the version # will make any difference in performance in this. The best way to check (providing you aren't getting any errors now) is to load your site and see what size a good-sized downloaded page is (in IE, right-click on a thread's page and select "properties", it should be a very small 5-12kb or so file).
Mark Try moving the first 3 line below the use strict; I am grasping at straws here since I can't actually see what's going on. Do you also have String.pm in a Modules/IO (case sensitive) directory?
Be sure you have set permissions on the directories and .pm's so they can be read as well
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