What Vim features are missing in Emacs with Viper and Vimpulse?

Question

There are important features of Emacs which are missing in Vim, such as the comint mode, and there are no scripts/plugins which can replace them.

There are also benefits

Answer 1

Unfortunately, no mode can make Emacs work as fast as Vim.

If you mean that the emacs startup time is poor, you can cut it down dramatically by having an emacs session permanently open, and use gnuclient/emacsclient whenever you need to edit a file.

http://www.emacswiki.org/emacs/GnuClient