That's not supposed to happen then. Browser/OS ? CPU usage?
If you're using the live demo, it might be lag due to running 4 instances of bubbly. How does this run? https://codepen.io/tipsy-/full/yzPaKK/
> How does this run? https://codepen.io/tipsy-/full/yzPaKK/
This is much better but still slower than what shows in the gif on your github readme. CPU usage 50-60%.
Maybe I should just try in Chrome ;)
Edit: vastly better performance in chrome. I guess Firefox isn't there just yet.