Thanks Gustavo.
Basic usage of CDF as you describe is not very different from normal internet browsing. We have not tested this extensively (and it varies a lot across our userbase), but I would think that as a ballpark, anything from around 1Mbps should be sufficient (latency will also be a factor, and may slow down some of the interactive elements of the user experience such as cognite charts). I did a quick test, and the Chrome network profile “Fast 3G” worked pretty well, but “Slow 3G” felt very sluggish and provided a poor experience (what is “acceptable” is user-dependent, of course). You can play around with these yourself if you have access to a CDF instance - here is a tutorial explaining this for Google Chrome:
https://www.debugbear.com/blog/chrome-devtools-network-throttling