This machine has been upgraded with 32GB RAM and has two fast internal SSDs, replacing the original (lacklustre) 1TB Fusion drive setup. As a result this is a very snappy machine. The original Fusion drives have a tendency to slow down after a couple of years as its small SSD degrades quite quickly – the performance leap after the larger SSD modification was enormous.
For professionals requiring a powerful, high-resolution display computer, the Apple iMac late 2015 (27-inch, 5K screen, i5 CPU, 32GB RAM, 512GB & 4TB SSD) is a great fit.