Hi, I need to make a choice. There are three possibilities: 1. iMac 2015 with 2TB Fusion Drive 2. iMac 2017 with 256GB SSD 3. iMac 2017 with 2TB Fusion Drive My assumption is to split Fusion Drive into 2TB HDD & 128GB SSD. To me 128GB SSD would be enough to put there system + Lightroom catalog... and move home folder to 2TB drive. BUT how fast is 128GB part of 2TB Fusion drive? I couldn't find the answer to this question... can anyone help? Ideally we could compare benchmarks of 128GB SSD part of both 2015 & 2017 version + 256SSD of 2017'