Major improvement of personal page work load

The personal page has an extreme database load. The number
 of database queries is heavily dependent on the number of
 objects loaded into the views such as own_comments, etc etc.
 On my almost-empty local database this resulted in 94 queries
 in a single view request with a significantly long loading time!

This is a quick and dirty, first improvement. Splitting the different
 tabs to different routes or dynamically load the tab content when
 opening seems a best option after all.