At the app level, I'd say it's about responsiveness not latency. Instagram had a post a while back about how they cheat a bit to make their app feel responsive

At the app level, I'd say it's about responsiveness not latency. Instagram had a post a while back about how they cheat a bit to make their app feel responsive even if actual latency was high. From this perspective one could say this article puts too much focus into the raw numbers, how many ms to a response. As techies, we like that: cheating is cheating. Numbers are important. But really we need to look harder, how can we make users perceive that things are better than the raw numbers.