Speed is not the mark of a good browser. If you are using speed as your mark, then you have never coded for the web and have never gone through the trials and tribulations of IE. If speed was the target, then Lynx would be the best of browsers.
https://www.youtube.com/watch?v=w7VNjGuSK_k
https://www.youtube.com/watch?v=FaNpWJY9SEs
https://www.youtube.com/watch?v=RrDHrwLUtvk
I agree that speed isn't everything, but switching to IE is often a relief these days when Chrome has managed to spin up my Surface 3 Pro's fan yet again just browsing average sites.
> then you have never coded for the web and have never gone through the trials and tribulations of IE
I've been developing for the web since before any version of IE existed. You?
But you say you agree with my point.
If your Surface 3 can't handle the computing needs of a browser, that's not a resounding recommendation for owning a Surface.
As far as developing for the web, I've own a web dev company for 10 years and, among our list of clients, we manage two web sites you have visited before, one of which you probably visit every week or so. I was also, once, invited to work at Mozilla but declined. Does that answer your question?
Seriously though, everyone I knew who jumped from Firefox to Chrome ~5 years ago did it 100% for performance. We were switching to Chrome for speed even despite it lacking a lot of key features (e.g. dev tools, extensions, third-party cooking blocking, Flash blocking). Speed might not be the only important mark of a good browser, but it is a crucial ingredient.
Suffice to say, if IE11 was that great, they wouldn't be dumping it and rewriting. That's considerable effort.