Hi all, new to forum here. I have a late 2012 iMac 27. 3.4ghz Intel i7, total of 16GB RAM, 750GB internal SSD and an external 4TB regular hard drive. Runs Yosemite 10.10.5. I haven't upgraded it in the 6 years I have had it, when I bought it I 'went big' on the spec, hoping that it would last me a long time. I used to do a lot of photography editing, but then 2 kids arrived on the scene and now the Big Mac is used for family web browsing, and archiving and browsing our family photos. Recently I feel that it has slowed right down, and I'm wondering why, and what I can do to fix the problem. The SSD is very nearly full (only 10 GB of capacity left), and we have around 2.1TB used on the external drive. The expensive option is a new iMac, but I'm wondering if it will be a big leap forwards from what I currently have. What I am also considering is upgrading what I have - I still have two memory slots free, so could go up to 32GB, and I'm also thinking of changing my 750GB SSD internal drive for a 2TB version. Question is - would those upgrades make much of a difference? Or is it time for a new machine? Anything else I can do to make my system run faster? Thanks.