The best performance upgrade for older computers and laptops

How would you like to experience seeing your PC or Laptop to startup and behave faster when clicking and opening items? If you don’t know already, SSD drives, compared to traditional disk drives, advertise to be 10x faster. Is this just marketing? I would say definitely not as I have replaced disk drives with ssd drives in eight computers and laptops this year, and every one has put a smile on my face when I restarted it with the new drive. So if you have a computer that is older and you want to keep it longer (and why not) an ssd drive upgrade is the way to go.