>Great content, though original presentation is unusable. My whole computer started to lag, not only the web browser (chrome). Probably Google's web developers use very powerful workstations..

Yes, this is one thing I've noticed; I think your guess is right. It is a peeve of mine about some Google products. Some of their other products seem to have the same or similar issues - and not just performance; truncated or somewhat unusable UI is another area, due to monitor size, for one.

When Wave first came out, I tried, it was so slow as to be unusable.

You'd think that they would test their products on lower-specced hardware, knowing that not everyone has the same h/w as them.