My suggestion about removing jQuery was to actually replace it with
http://vanilla-js.com/ , because plain DOM manipulation doesn't need jQuery. That would make it smaller, with less overhead, and thus better for old devices.
I would even try to do that myself and send a patch, but I see a bunch of minified functions in the source-code. That makes me wonder if such functions were copy-pasted from another project or if they were written from scratch. And if they were copy-pasted, it makes me wonder about the license of the original source-code where it was copied from, and the license of your project as well. (And it's important to give credit to the original project too.)
I'm not accusing anyone, these are just questions that came to my mind.