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 5

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.