Worldwide, 99.999% of PC's, both laptop and desktop, are so poorly set up and maintained that they will operate at below 50% efficiency.
As a working computer tech, I can say that just cleaning up and tweaking the OS, I can improve most PC's performance by 100%. For most users, adding an SSD or even more ram is just not in the budget, even if they have the expertise to do the work.
I regularly hear from a new customer, "dang, it didn't run that fast when it was new!!!" I know.
The internet is a good source of tips to improve the performance of any OS from Windows 95 to Windows 10. For most people, changing a CPU is just not in the cards. Most motherboards are built and programmed for the CPU chip installed at the factory, and that's the only one they will accept.
After-Market motherboards, like from Gigabyte, Biostar, Asus, etc. are much more flexible and can usually accept a number of different CPU's within the cpu brand....i.e. Intel or AMD.
Good Luck and Happy New Year!
TechnoMage
