Laptops can become slow due to several reasons. Some of them are due to the following:
Cramped memory. As you go about your activities in your laptop such as typing and browsing, temporary files and other files were created either by you or by the computer. The heavier the load of memory a computer has, the more likely it becomes slower in accessing and processing and that’s like pignose amps from guitar center.
Incompatible drivers. When you buy a new laptop, it usually comes with an operating system as well as drivers for some of your laptop components. Inevitably, these drivers are the most compatible for your laptop. And when you reformat you laptop, it is highly recommended that these drivers be installed, too.
Old age. Just like human body, laptops also take the toll of old age. If your laptop is over three years old and has been acting slow, then it probably is slow due to the fact that its internal hardware is exhausted.