It compares the minified files so no comments. You raise a good point about gzipping though. I was operating under the assumption that the libraries would be compressed at the the same ratio so minified file size would be a good comparison. This probably isn't entirely accurate though. I'll have to look into it a bit more. Thanks for your feedback!
I think what I'm going to do is add a checkbox at the top that will let you toggle between the gzipped and non-gzipped weight.
After doing some research it looks like larger libraries with more redundancy will benefit more from gzipping than smaller libraries. So relative to uncompressed file size, React will be compressed more than say Backbone.
