Implemented the thing we talked about on irc yesterday:

Before quitting, katomic saves background to png file and quickly loads it while starting up next time.
This saves us some unneeded svg rendering.
Startup is noticably faster now, check it out.

But now I can feel a small glitch at shutdown - because png needs to be saved to disc (if it's big - it takes time)

Another problem is that I still have to resizes before the window gets shown. And both of them aren't spontaneous...
So if I somehow manage to get rid of one of them katomic will start even faster. Hints anyone? :-)