Actually, rendering is often faster in Sublime Text than in vim. I am a vim user and use the 'cursorline' and 'relativenumber' options and until recently I could notice rendering slowness on OS X and Linux. Things seem to have gotten better recently (either in vim or due to hardware advancing), but I never saw such slowness in Sublime text.

(I wanted to like Sublime and have a license, but Vintage mode is a too leaky abstraction/emulation for me ;).)