With the javascript embedded in the module like it is (at least in 5.x) the browser is not able to cache the massive javascript that makes your module work...UNLESS you do caching on all filetypes, to include text/html (which the drupal default .htaccess advises against caching dynamic pages). The feature requested is to break this JS into its own .js file.
Comments
Comment #1
jvandervort commentedYep, no plans to backport the 6.x file caching changes.
Will accept a path though:)