Performance analysis

The following are test results from Chrome dev tools, scrolling the scrollbar component for 5 seconds in version 14 vs version 13.

Scrolling using the wheel / touchpad

Now

Performance using CSS scroll-timeline feature:

Scrolling using the wheel / touchpad (version >= 14)

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Then

Performance using JS scroll event:

Scrolling using the wheel / touchpad (version < 14)

Scrolling using pointer dragging

Performance using CSS scroll-timeline feature + dragging using JS pointer events:

Dragging scrollbar using pointer (version >= 14)

Performance using JS scroll event + dragging using JS pointer events:

Dragging scrollbar using pointer (version < 14)