Problems after Upgrade

Hello their,
after I upgraded my Piwik installation from the last to the latest version 0.5.4 automatically everything works extreme slow and the widgets are not loading completely.

What can went wrong resp. what is to do now for make it work correctly again? Maybe proceed the upgrade again manually through FTP?

The problem is solved, it was not the Piwik upgrade but a network problem on the host machine and Piwik was affected.