Don't know why you're getting downvoted. More performance is certainly always good, but without subpixel anti-aliasing the text will tend to look pretty crappy absent a ridiculously high resolution display.
Plus, every implementation of subpixel hinting I've seen (and I've seen them all, on all three major desktop platforms), produces absolutely disgusting colour fringing.
Just lay off the ClearType(tm) kool-aid and do normal anti-aliasing. We don't do colour-fringing anti-aliasing for any other geometric primitive, I see no reason to implement a font-specific approach that only works if the user is colour-blind.
I can see questioning the utility for current 2d applications but this is really critical speed when the large amount of translation and scaling of many pages in a 3d environment is the expectation.
The css3d "portal" solution for webgl doesn't seem like it can get us very far at all...
I'd use this today in my webvr/gl project if it was source complete.