Scroll event performance optimization

[a-kriya]

The scroll event currently triggers a relatively expensive operation: attemptLoad, and thus, getCurrentDistance which uses getBoundingClientRect a couple of times that will require a recalculation of the layout of the DOM.

The number of calls to attemptLoad can be significantly reduced by using a simple debounced scrolling handler.

Without debounce (console.count() in attemptLoad()):

With debounce (timeout of 50ms):

The scope of change is very minor. Would a PR for this be acceptable?

[PeachScript]

Hi @Syn-zeta , v2.2.0 has been released, contains the performance optimization, thank you very much!

[a-kriya]

Looks great, thanks!