Windows RT isn't too bad. You wouldn't actually notice a difference. A decade ago (or less), I had the first RT-based Surface running native Word processing a 300-pages PhD paper, it was running buttersmooth and cool, all the time.

I think this is more about MS' commitment to ARM than a software problem.

Weird, my experience with that same device when it launched was noticible input lag while trying to use explorer and microsoft word at the same time. The stuttering was so bad, scrolling and typing could take 100's of ms - now I wonder if I wrote off the whole RT experiment because I got a lemon or malware.

No stuttering, no input lag, we must have had different machines. Native apps were super responsive.

Windows RT doesn't exist anymore, it's just Windows. I think the only limitation of the ARM version is you can't buy it at retail.

Or they could share their driver source and you can run Linux on it.