It can be that the laptop/comp is hot and as a result slows down ur comp. you can check if maybe you have any Trojan horse. Because a result of that slows down ur system. (Control panel, performance and maintenance ,system and check ur status for any malware or threats. If i were you i would check my running programs to see if you can see any type of malware. You might also have Cluttered files over years and a result your computer gets full and starts running slow and freezes.