> I'd say I didn't notice speed, it seems to work about the same as any other web app. I don't doubt it's got cool optimizations, but I think they're lost on most people that use it.

We almost forgot that's the point. Speed is good design, the absence of something being in the way. You notice a janky cross platform app, bad electron implementation, or SharePoint, because of how much speed has been taken away instead of how much has been preserved.

It's not the whole of good design though, just a pretty fundamental part.

Sports cars can go fast even though they totally don't need to, their owners aren't necessarily taking them to the track, but if they step on it, they go, it's power.