Then that is slower. Not slow. That is like saying a Boeing 747 is slow because its half the speed of a Concord. Everything is slower relative to a faster benchmark. If PS4's RAM is the benchmark of very fast, half the speed of very fast is still fast. If PS4's RAM is average, then half the speed of average could be considered slow. So if you feel the Xbox's RAM is slow, that means by proxy PS4's RAM is slow. Because Slow multiplied by 2 = Slow. Ultimately we're going to see how it turns out. The games developers are usually the first ones to complain their grievances in regards to hardware limitations.