Was trying to find actual info on frame rate and couldn’t locate any, but I did find this demo video that makes it look to be in the 5-10 FPS range - https://youtu.be/WT031cs-tjo

So probably good enough for reading/coding/browsing static sites, but scrolling will feel laggy and videos/animations will be a hard watch.

Still a pretty significant improvement over the eInk displays you get in Kindles which can take 500ms+ to refresh.