...compared to the installed one (in a Windows 32 or x64 environment)?
I suppose the installed version is faster (at least when starting up), otherwise what would be the advantage in installing? :]
Anyway, I'd like to know for sure whether there is an actual technical reason for that and also, in case there is, how much is the... price of portability in terms of performance.
Supposing, obviously, that both the installed and portable versions run from the same local hard disk.