Clean install - what to do with a messy /user/library

Hello Community!
I'm planning to upgrade from Lion to Mavericks with a clean install. But I'm worried that the speed-advantages of an clean install will get lost by migrating my current user account/home folder. I migrated my main-user-account from  new Mac OS to new Mac OS for many years now and used/tried a lot of applications. I Think that my main-user-home-library is a mess now - e.g. when I create a new user  with my current Lion - System - this new user is already much faster than my good old main user.
So my question is: should I clean up my current main-user home-library before upgrading? There is the "risk" of deleting to much or not enough.
Or is it better to create a new user and just copy from the old user-library what I need (mail, firefox profile, addressbook....) Do I get with this procedure permission problems?
Any suggestions or opinion is very welcome
Dietmar

I think you would be better off  doing a clean install, making a new user account, and then carefully moving selected items, not just moving your user account or Library folder over, "cleaned up" or not. It might take a little longer that way, but it's worth it. A clean install avoids a lot of problems.
I made a list of stuff to move over. Many items (at least the ones I use) are stored in iCloud anyway; they sync directly from the iCloud server, which takes care of Contacts, iCloud keychain, and Safari bookmarks.  For mail I just recreate the accounts I have by entering their passwords in Mail.app. Ditto for network settings. I "manually" transferred my iTunes music, ibooks books, my photo library, and my documents from Time Machine. Then reinstalled my apps from clean installers. Trying to "tidy up" my Library or User folder would just be a mess. I don't do clean installs that often, so it's worth the effort.

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