Thank you! I didn't even knew that Show HN existed. It's exactly the right thing.
I'm currently comparing the latencies for recording (recording through a web browser vs recording through an android app) and seeing how much I can reduce the latencies. Rockr wants to be useful, and useful in audio engineering generally means "low-latency" (especially in a loopstation where audiotracks must align perfectly). So it's not sure at that point for me to either stay in the web browser or switch to a potential Rockr-app.
JQuery offers optimizations, but they are limited to the capabilities of web browsers of course.
Thanks for your input!