The current state of the PC market is that you must spend an extra $200 to $300 on a new computer to run Windows 10 properly. The same thing is happening to Windows 7 as well. Thanks to all the new updates, all versions of Windows are running slow without special new hardware that most people are unfamiliar with.
That new hardware is “SSD”, a.k.a. “Solid State Drive”. It makes computers run three to five times faster because it uses memory chips instead of moving mechanical parts.
It’s best to get an SSD with a new computer. Retrofitting can be done on current computers but is not a cheap or sure thing to transfer everything seamlessly.
Many computers already have SSDs. MacBook Air, Google Chrome Books and Boxes, iPads, etc. are all examples of this.