Steve bought a new iMac with a Fusion Drive, but it seems as slow as his 2013 iMac. Leo says it is! It's a common problem with fusion drives. Leo says that you could have an SSD installed to replace that Fusion drive. However, you don't want to try and do it yourself because you would have to lift your screen off with a giant suction cup to get to the hard drive. You can go to MacSales.com for the hard drive you want.
Apple is now allowing third-party, Apple Authorized repairs. So you can find a technician in your area that is authorized to install the hard drive at a more affordable cost than the Apple Store.