I've hit a related problem with my interactive display from A.G. Neovo. For use as a whiteboard, I really want low latency from (a) dragging the stylus to (z)

I've hit a related problem with my interactive display from A.G. Neovo. For use as a whiteboard, I really want low latency from (a) dragging the stylus to (z) the display catching up with what I've drawn. Their built-in Android app is great in that regard, but it's proprietary so it's not good for collaboration. Unfortunately, there's much worse input-to-update latency if I use it as an external touch display, or if I use it's built-in Chrome browser with whiteboard websites. Without the ability to root the device, I can't really investigate the source of that extra latency. And it's not Google Play certified, so I can't install native whiteboarding apps from some the well-known vendors I've tried. (Those vendors require installation via Google Play.) It's been a frustrating and expensive experiment.