I came here to say this. Would have been a lot better if it were all in a single window. The browser chrome doesn't help anything, and it just gives you bad associations of annoying popup ads.

I'm not sure about the mechanics of Chrome, but aren't new Chrome windows different processes? thus having their own share of CPU?

Trying to cram everything in a single thread of execution seems like it would have been a mistake.

Now that would be clever.

Though playing the demo with one eye on Task Manager shows only two processes (for the whole duration) - one hovering mostly around 50-60% CPU load, another at 0-5%.

Checking this with my CPU intensive demos, this looks like normal Chrome behavior (two processes, one with high load). New process seems to spawn only for new tabs.

So it doesn't seem like such optimization was used.

I think it's something like one process per "connected" set of windows/frames (those which can talk to each other and thus are expected to be single threaded), plus one per Web Worker (V8 is not threadsafe)

Do separate iframes have the same characteristics as separate windows?