From personal experience, black and white epaper can run at ~20-30hz if you turn off the page refresh system. This usually dramatically cuts down on bit depth a

From personal experience, black and white epaper can run at ~20-30hz if you turn off the page refresh system. This usually dramatically cuts down on bit depth and dramatically increases ghosting, however. With page refresh on, you can expect ~5hz with some nice strobing inbetween.