"sparkleisacolor;14057009" wrote:
I have them all installed (I quite like my expansions). I removed all my CC already, so it shouldn't be anything to do with that.
That's your problem unfortunately. Your iMac's graphics card has 256Mb VRAM, it's struggling with all the heavy processing and rendering required for all the EPs, especially Seasons and Pets.
You could try lowering your graphics settings. You could also delete the caches files. Read this thread for info on the ones to delete - http://forums.thesims.com/en_US/discussion/658546/mac-help-threads-guides-please-start-here-before-posting-a-problem-updated-05-06-15/p1
Whilst you're on that thread read up about Cider too :)
