Director of UX here. This year we rewrote a lot of the data flow plumbing in grafana to allow streaming with the very goal to enable sensor and other high frequency use cases. More to come soon
How much of those improvements is in current versions of Grafana? I've tried building some dashboards in Chronograf for some data I work with, but there's a lot of sensors that update very quickly so the graphs basically killed the browser tab. If Grafana is better at handling that sort of use case I'll definitely check it out.