You may have a lot of cookies, browsing history, among others, in your system. You need to dispose of these files including temporary files that your computer downloaded while you're surfing. These things slow down your computer. In Mozilla Firefox, you can get rid of this junk by clicking Tools, then Clean Private Data. Check all items (unless you want to retain the password) and click "Clear Private Data".
Also, you may defragment your disk using Auslogics at
this site to boost the overall speed of your computer.
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