At 20.04 06/02/2004, you wrote:
It's comparable fast for me, but it's UI speed is theoretictly a bit worse because it uses it's own control toolkit and supports skins.
most people overlook, or ignore, that Internet Explorer does *exactly the same*. The chrome is probably written in WTL or even bare Win32, but the web control is *entirely* owner-drawn, and supports skins even in page rendering. I'd say that, apart from writing an iexplore.exe clone and adding (enabling?) Mozilla support for Windows themes, no work needs to be done in this field