I got excited about setting up a pretty and efficient coding environment in Vim, inspired by Jeff Knupp. And on my home computer, an Ubuntu machine, it worked perfectly. I ran into trouble with MacVim on my work computer (the boss is an Apple fanboy). MacVim would load very slowly--15 seconds or more--would take several seconds to open or save even small files, and what's worse, I couldn't find much evidence of other people running into similar problems.
Using mvim --startuptime vim.log, I was able to see that the largest hold-ups (seconds long!) were caused sourcing .vimrc and pieces in Vim's runtime/ directory. Armed with the "sourcing" search term, I found this post. Although I don't even have Go installed on my computer, it seemed likely that the problem was that the MacVim directory was located too late (or not at all) in the runtime path on Vim startup. So I added the following line to .vimrc:
set rtp+=/usr/local/Cellar/macvim/7.4-73/MacVim.app/Contents/Resources/vim
(Since I'm using a Homebrew install, as one should).
Problem solved. Load time is now under a second, which I can happily live with.