I'm a big fan of tmux* and vim but there's a limit to the complexity of system that you can develop efficiently with vim. A good graphical IDE used by a skilled operator will be more likely to generate correct, consistent code faster. If you're using vim and think you're developing as well and as fast as you can, you're probably wrong. * 17 years of screen and I've finally switched over to tmux. None of the features…
tmux: is it faster because it's more efficient about sending updates to the terminal, or are you talking about server-side resource usage? I certainly wouldn't say no to a more responsive terminal.
To make the switch-over even easier, rebind to C-a instead of the (sensible) tmux default of C-b. Put this into your ~/.tmux.conf:
set -g prefix C-a unbind C-b bind C-a send-prefix bind-key C-a last-window