[Dragory]

just a scrollable div of a couple dozen large images is enough to make it stutter seconds at time while they load and render

I might be wrong, but with WebRender, isn't scrolling now done asynchronously so it doesn't stutter while things are loading? I certainly haven't experienced any scroll stutter since I turned it on.

[majewsky]

WebRender is not really used by Firefox yet. They're currently rolling it out to some very narrow sets of end users.

[pcwalton]

Scrolling has been async for many years, both with WebRender and without it.