Wheel event listener causing performance hit while scrolling

[danielcardoso5]

A wheel event listener is added to the document element after smooch loads. This causes a performance hit while scrolling the pages where smooch.js is included.

What's the reason for this event to be added? The scroll event listener is also present and doesn't affect scrolling performance that much.

The issue can be seen in Chrome dev tools, in the rendering tab by enabling the scrolling performance issues checkbox.

[lemieux]

Seems like React does that by itself based on facebook/react#1254. From what I understand from this issue is that whenever you use onWheel in your React tree, it will bind it to the document too which is not really desired.

I checked where we use onWheel and I'll bring it up to the team to see how we could work around this problem.

Thanks for the report!

[danielcardoso5]

Hi @lemieux, any update on this issue?

[alavers]

I suspect #503 fixes this issue :)

[danielcardoso5]

I can confirm that it's fixed. Thanks @alavers @lemieux :)