The only thing I can think of is to disable the HDR by toggling it off when packaging for lower devices.
I’m not sure how useful that’s going to be if some of the devices that will suffer severe performance drops think they’re powerful enough to use the HDR, but is that possible? Packaging the build specifically for particular devices/device profiles? Is there some documentation about it somewhere? It would be good to know what options are available here.
They may come back and say this is intended behaviour, which is about what it sounds like but I was hoping through other troubleshoots that this would resolve itself.
To be honest, I’m half expecting the official answer on this thread to be: “If you have Mobile HDR on, older devices will perform extremely badly and there’s nothing you can do about it” - that’s the conclusion we came to a few months ago but, as our game looks a lot better with the bloom on, so I figured I’d check and make sure that it isn’t just a bug or something that we’re doing incorrectly on our end first.