+1 from me too. I think the potential for speed is huge for this patch. The less files we load the faster Drupal will be for sure. Some comments: - I am torn about the .register file though. Why? Because we are moving towards too many files already (first .install, then .info, then .register, then .foo, ad nauseum). Perhaps this is overcome by one hook only modulename_register() or modulename_callbacks(). - Another option is to have a compiler for Drupal. Once a site is "compiled" all the modulename_callbacks() functions are written to ONE file for all the site's modules and themes, or perhaps two files, one for core and the other for contrib. This single file (or two), can be loaded once instead of some 30 .callback or .module files, which will be faster. We then get the benefits of Karoly's split patch as a bonus. - In development mode, the compile step is dynamic, making the site slower, but guaranteed to be "fresh". - We can even make the development mode be the default if we want, and the compile step is an optimization step for sites who need it.