I have high end stock 2015 5K Retina iMac with the M395 card and 2TB Fusion drive. I know it's not a beast or anything, but I can't hardly even play The Witness on the lowest resolution (720p). Half the island is an absolute slideshow, which doesn't make sense as I have higher than the recommended settings. Nothing about this makes any sense to me. Can anyone who has this game tell me what their performance is? It just seems pathetic to me that my iPad Air 2 could be a better option when it has a far inferior GPU.