> The speed and amount are tightly coupled - it's not possible to process large amounts of data at a slow speed.That's true (and much the same thought occurred to me), but there is still a difference between bandwidth and latency, and we use "speed" to talk about both.
Latency in its many forms has (on average) decreased enormously as well, whether we're talking about personal correspondence, fashion trends, research and development, stock trading, political speechifying, or practically anything else.
It's probably easier to distinguish between the two aspects of "speed" through their side effects.
The increased volume of information drives narrowing specialization, for example, while decreased latency increases collaboration.
Economically, you can also think of increasing bandwidth as falling distribution costs, and decreasing latency as falling distribution time[0].
So, yes, increased volume of information means that you have to absorb more of it faster even if nothing else changes, but decreased latency makes you, the human in the loop and the frequency with which you poll your information sources, the only remaining bottleneck. It also makes the dopamine hit of immediate feedback apply to ever broader contexts (thus, gamification).
So we get inane phenomena like "First post!", or two dozen voicemails left before lunch because some horrible event in your city made the national news while you had your phone turned off, or flame wars spiraling out of control over the course of a few hours, and so on.
So, yeah. Information coming at you faster isn't just about the amount of information produced or consumed in a given amount of time, it's also about how quickly you then see others' subsequent reaction/response, and how quickly others can see yours[1].
[0] This is complicated by the fact that even here we're talking about both reduced time-to-publication from automation and dematerialization, as well as the falling cost of speed-of-light distribution, getting it into the hands of people everywhere and anywhere, and into (or replacing) every link in the chain.
[1] "Just because you can, doesn't mean you should." definitely applies here, but as elsewhere, isn't necessarily all that helpful.