Aperture and computer unresponsive with photostream

Hello every one, this will be my last ditch attempt with aperture before binning it.

Its been very unstable for me for sometime now many months on both an imac and macbook, updates from apple seem to be making matters worse.

To cap it all photostream seems to kill it entirely. Most of the time it seems to either be processing images or doing something with photostream. Whilst this is happening aperture is either dog slow or totally unresponsive and infact half the time my entire mac seems like its about to melt down.

Aperture as a programme seems to be falling over pretty rapidly for me, I don't know if anyone else feels that way. In an attempt to mitigate the issues I expereince all the time I have given up using raw, because these knock it over, on an imac quad core i7 with 8 gig of ram. Lion certainly has not helped and with photostream compounding it, I am finding productivity with aperture sliding.

IS anyone else having issues with this 'professional' software now?

Yes I have rebuilt the database and library many many times, fixed permissions, done all those things that make no difference what so ever. I repprossed all masters and thumbs before going to be one night and this helped for a while.

Aperture on my macbook is game over really, its just too slow and unresponsive to be considered viable.