2.2 Using w3m: the reason why emacs-w3m is fast

Emacs-w3m uses the external w3m program as a back-end to retrieve web contents and as an HTML rendering engine; that's how we could create an accelerated Emacs web browser with asynchronous operation.

You must install the latest w3m, it is available at:

http://prdownloads.sourceforge.net/w3m/