The nepomuk crap (the integrated desktop search and file indexing via strigi and virtouso backend) causing loads of cpu on dbus and also akonadi should be disabled by default. Go to preferences – system settings – desktop search and disable the desktop search. Unfortunately this does not prevent the nepomuk server to be started.

Un-autostart it

/usr/share/autostart $ sudo mv nepomukserver.desktop nepomukserver.desktop.disabled

drop the unused file index (over here it was 1.4GB (!!!))

~/.kde/share/apps/nepomuk/repository/main/data $ rm -rf virtuosobackend/*

And now make some config edits

$ vim ~/.kde/share/config/nepomukserverrc
[Basic Settings]
Start Nepomuk=false

$ vim ~/.kde/share/config/kdedrc
[Module-nepomuksearchmodule]
autoload=false

$ vim ~/.config/akonadi/akonadiserverrc
StartServer=false

note: kontact, kaddressbook, kmail, korganizer, kalarm, etc are akonadi dependant and won’t work anymore. but actually, i’m using different applications.