I don't know but I would guess that you were unlucky and got a faulty product to test or maybe the additional features vs the M91S like the touchscreen aren't that well implemented yet, using excessive amounts of processor power. I just think Onyx wouldn't launch a product with such visible faults, it would be a suicidal move. Some memory leak or an infinite cycle repeating itself, I don't know.
Well but I'm not doubting your work on doing the review, actually I appreciate the work you put unto to it, it's just that I don't believe the product will be launched like that but it was nice to see the comparison between them and the features of both of them.
I still have hope for Onyx, gambatte