I recall that ART can handle Quattro X3F files well (I am aware that SD9 might be totally different). I have SPP too, but try to avoid it. It’s quite slow. But I haven’t updated for ages.
@Donatzsky - you can find Quattro X3F files easily online and try it out. I can also donate some X3F from the Quattro - and remember, they must be from the SD Quattro.