I would LOVE that for markdown and org mode buffers.
Support for that won’t be added. The primary reason Sublime Text is so fast is because it assumes every line is the same size, changing font size/face breaks that assumption.
Drat. I had hoped.
I love the pretty editing experience that is possible in editors like emacs for documents, but I am using sublime for the performance.
Wish both were possible.
The other two big emacs features i covet are narrowing and overlays.