Hello there I noticed something that is driving me crazy and don't know how to solve it , just as a background i am a photographer and do a lot of photo editing I own a late 2008 imac with maxed out ram and regular hdd, every time i used preview to scroll over my photos, they will appear blurry at first, fooling me into thinking i took a blurry picture, but after a few seconds it will clear up and get sharp. So i thought why not change the hard drive? it was getting slow regardless, so i open it up and changed it to a speedy SSD, all done without any issues, but unfortunately to my dismay the problem kept persisting (i have a feelign im not the only one) Then i decided to buy a barely used imac late 2015 model, 3.3ghz/m395 8gb ram with a 2TB fusion 27", i figure it will solve all my problems, and to my surprise it was still the same issue! What do i need to solve this problem? is it a normal thing and i should live with it? all photos were put on the hard drive so i cant blame any external media, also, my brother has the same computer BUT with ssd, so i figure let me head over his house and try it out, guess what? same issue It's driving me nuts, any ideas? will more ram help? thanks for reading!