I am one of many people in my circle of associates that has been waiting for improvements such as this.
Without knowing who your "associates" are and how large/important they are, I would say this is irrelevant.
I stopped using Firefox (and IE before it) specifically because the speed wasn't up to par, and am now happily using Opera.
This I don't understand: "speed wasn't up to par". Is there some objective means to tell when something is fast or slow for yet emerging technologies? It sounds more like you are simply saying that you used whatever was fastest until you found something faster.
Also, I don't really agree with your other point, it smacks of the same opensource arrogance that permeates discussions around here. Firefox is not so much better tha IE that your scenario actually makes sense and the assumption that people are ignorant or are forced to use IE is just wrong.
Agreed. Although, I would say that for most people usability and reliability trump speed and "open-sourcy-ness".