I tested cnn.com and nu.nl on a on a low end atom surface tablet with low end intel GPU running on battery (without direct composition) and scrolling has improved quite a bit since the bug was reported, although it still isn't as smooth as non-webrender. I'll make this bug specific to Windows since there is a chance that direct composition helps and we have an equivalent bug on linux.
Bug 1532961 Comment 19 Edit History
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I tested cnn.com and nu.nl on a on a low end atom surface tablet with low end intel GPU running on battery (without direct composition) and scrolling has improved quite a bit since the bug was reported, although it still isn't as smooth as non-webrender (a bit more jank every now and then, but scrolling is generally good). Render backend and renderer times are pretty reasonable on these two pages. I'll make this bug specific to Windows since there is a chance that direct composition helps and we have an equivalent bug on linux.