They're multicore devices but often only one core is free. Depending on how important you are, the rest are busy doing other things and you're not going to get scheduled.
This thread was someone saying there haven't been any advances in CPUs and GPUs in general.
You seem to be in a completely different goal post shifting context of some mythical mobile device that has only one core, but actually has multiple cores, but all them are pegged at 100% all the time. This doesn't make any sense in any context since it isn't even true, but it has nothing to do with what you are replying to.
