Sorry cant edit. I bought a lite 2 with same chips but without ethernet,with wifi. I tryed android and works fine. Is posible port android from opi lite 2 to opi one plus?
Not all applications/processes are multi threaded. If a background task is running, and that is probably all of the few services that are on the Beta Ubuntu images provided by Sunxi it is likely only using one core at any given time and cpu0 (first core) is first in line to execute the thread. I use crypto hashing programs and they assign work threads evenly along all cores and I am not seeing a bottleneck like you describe in my scenario at least. Still we are using old kernel 3.10.65 but I am happy with it for the time being. Satisfactory mainline kernel support might be available by the end of the year along with stable Armbian images which currently the WIP images underclock the cpu to half of the 1.8ghz possible so are useless.