@zoove Great write-up. Though, I have seen several people requesting functionality in Metabase, so it could be used as a tool for various loggers, which gives seconds/minutes data, but that's really not what Metabase is designed for and there are much better tools out there that.
As for DOM vs Canvas. Yes, that's true. And we're definitely feeling some pain-point from DOM and repainting, which we try to optimize as much as possible, but Metabase is a big project, so that's not just something you can fix in a couple of days.
We definitely want to make Metabase more performant and capable, but our priorities will still be on "human" data vs trying to be a replacement for logger graphing tools.
You will get 10k results if you aggregate your results in the GUI questions, so that would still put you above the limit for 30x365, but 27 series would be fine.