Well the best option if price ($1k) is no object would be the new version of the 13inch e-ink monitor:
https://www.indiegogo.com/projects/p...monitor-13-3#/
Here's the discussion on the new model:
https://www.mobileread.com/forums/sh...ghlight=DASUNG
The new version is supposed to have HDMI input which should cut down on the lag a bit.
Otherwise you might want to check out any of the Android based e-ink readers, at least the browser will render everything.
My Sony DPT-S1 is only good for very limited set of web pages (text heavy no javascript).