yum dis-upgrade from FC4 to FC6?

[Deboo ^]

A friend somehow configured yum for me and it's working but extremely
slow. What I did not like of yum is that for any command, it takes
long and goes and checks on the site for something I don't know what.
Can't it use a cache like apt?

Also is it possible to do a dist-uppgrade from FC4 to FC6 like the
dist-upgrade in Debian? Or do I need to install from scratch, FC6?

Regards,
Deboo

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