I use vim on Mac OS X, but this is realy slow in Terminal.app and iTerm.
Progress over many lines becomes tedious.
some idea of solution?
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Try MacVim. There is also a 64 bit version available somewhere on the blog, which includes a new rendering layer.
For me, using a Retina iMac, neovim, tmux, and a bunch of neovim plugins, I found that the only thing that made a difference in scrolling & rendering speed was keyboard repeat rate! Nothing else — Terminal.app vs iTerm.app, neovim vs vim, no vim configuration vs my usual, tmux vs no tmux, cursorline vs no cursorline, etc — made any real difference in the slow rendering & scrolling I experienced.
Once I set key repeat faster than available through System Preferences, rendering & scrolling in vim became 2x as fast, regardless of whether I was loading all my plugins or not. I wrote a bit more about the factors I investigated in this comment on tmux issue #353.
I would investigate whether keyboard repeat rate improves the situation for you.