kmail + akonadi + nepomuk = checkmail takes forever :/

With kde 4.4 kmail will refuse to start without akonadi and nepomuk being 
active so I setup both and now when I start kmail I need ~15 minutes for a 
checkmail. Mind you, this is only for the first checkmail; the following, 
automatic, ones are (apparently) as fast as they used to be.
For the whole time kmail uses a substantial amount of cpu (25% on a 
Pentium(R) Dual-Core CPU T4300 @ 2.10GHz) and makes the hard disk cringe and 
sob under the load, if I want to start an application after kmail during this 
time, it takes forever. Running applications have no problem until they start 
some substantial disk I/O.

Well, this is very, very disappointing.

I have 4 pop accounts and 3 dimap accounts, maybe it means something to you...

Thanks in advance for any tips you may share to eliminate or mitigate this 
issue.