Apparently 343 has fixed framerate problems due to graphics and shader issues. Can't link right now on mobile, but the Forgehub Twitter page tweeted about it.
I agree. It would be at zero/totally fine unless your screen wouldn't move, then it would be like "Uhh, little performance issue over here."
Is this what you're talking about? https://twitter.com/ForgeHub/status/823020330637815809 Not sure who on the staff tweeted that, but they don't say anything about having resolved the issue. At most that they're looking into it still. Unless I'm missing something I wouldn't hold my breath.
Every time they say they're looking into something they start it with, "no promises." As if we could even get our hopes up at this point.