There is really no one specific thing that you can say determines the speed of your internet connection because there are several players and components responsible to deliver internet to your PC or laptop. Internet speed is not just determined by the speed of your computer's processor as many people think.

What does Internet speed depend on?

Your internet speed heavily depends on your network equipment, such as the router or cable). For example, an ethernet connection is generally more stable and quicker than Wi-Fi. If you're using a Wi-Fi connection, your internet speed might decrease as more devices connect to the same network.

Does processor increase Internet speed?

Yes, the Processor Speed Matters—Somewhat

When you have a powerful, quick processor in your computer, your applications can handle information at a faster speed. The load that you are putting on your CPU will have an effect on how long it takes a webpage to load.