~/.vimrc as a test, it shows no delay.
I thought perhaps it was something to do with the syntax highlighting, but when I ran
:syntax off to try and fix it, the delay still showed up. I also tried
:setf text, which also did not work. I have only a couple of plugins installed (CtrlP, NerdTree, and highlighters for Jade, Less, and CoffeeScript) so I don't think that's what's interfering.
Does anyone know what could be going on?