[SOLVED] Update with Krypton

[syco]

Hi guys,

I have not been updating my Pis (B model, 512 MB RAM) for a while
and when I updated Xbian last week, I realised it has got Krypton
now.

Unfortunately, those Pis are now unbearable slow as if Krypton was
just not meant for that cute old hardware.

Literally, every command or anything takes 10 to 30 seconds to interact
and starting a file is just a lucky adventure now, because often it will not
start at all (the file).

So, there is just this question for you guys:

Is Krypton not a good idea for the first/old Pi or do I have to change
something to get a nice working interface again?

I remember under Gotham or Jarvis, it was way better/faster.

Do I have to downgrade and if yes, can you tell me the easiest way
without deleting and reinstalling everything from scratch?

Thanks, guys.