Hey CSJ ,
Thanks for reaching out and asking these questions! Happy to hear you like Buttonizer ! 🚀
The sourcemap warning-message is known to us and in our next update it will be removed from the distributed files. We hope to deploy our next update in a couple of days. So this issue should disappear automatically.
Regarding to the page load times, we're in the process in minimalizing our bundle. We actually already minimalized a lot since a few months, while this is a ongoing and slow process, we do our best to minimalize the bundle each update we deploy.
Good to know: when one of the files is loaded, the next time it's in the cache, so it won't be loaded again.
Please let me know if this helps 🙂