Thanks for your reply, that's the thing, I too have 8GB of RAM, so unsure what maybe the issue Im experiencing. Not sure how many photos I have in my iPhoto, but I know its in the thousands.
could be a cache need clearing out,also,dont display them fully enlarged ,ie reduce to smallest size with slider etc,and dont use slider with too many loaded either,will beachball for me,ive got bout 4k at the moment in iphoto.
Ok, thanks, will give that ago, I have cleared it out now though, and sorting out my facebook, and flickr web connections, lost a few pics in doing so.