".why the downvotes? I don't care about the karma, just want to understand why I was wrong."

Voting on HN has gone to the dogs a bit recently with thoughtless (and often mass) downvoting. There is often no real "reason" except some dumb fellow got up oon the wrong side of the bed today.

My suggestion, don't worry about it, just say what you want to. By and large, good comments are upvoted sooner or later. (upvoted you btw)

Thanks (and I agree with you), but like I said, really not concerned about the karma. Just wanted to know if I'd said something foolish or incorrect.

Computers have different speeds, and the same software still runs on them. (Unless the computer's too slow or the program is sloppily coded, but then that's the fault of the manufacturer or programmer.) Why do you think a framework should iron out performance differences?

I specifically don't think that. My comment's grandparent mentioned performance differences between browsers, and my comment's parent suggested that a JS framework could smooth out differences between browsers. I was pointing out precisely that a JS framework wouldn't be able to compensate for that.