I don't think there is any disagreement about the speed. NaCl will be faster than Flash and other options. But consider that Alchemy will run in 98% of web bro

I don't think there is any disagreement about the speed. NaCl will be faster than Flash and other options. But consider that Alchemy will run in 98% of web browsers (because that is how much range Flash has), while NaCl will only run in Chrome. So there is a difference of about 4X in market share. I'm not saying Alchemy is a perfect solution. Each option in this area (Alchemy, NaCl, JS) has different advantages and disadvantages.