what affects internet speed
Other factors could affect your Internet speed, including how many computers are connected to the network, existing computer viruses or outdated computer software. Use a speed checker website to check Internet speeds in your home or contact your Internet service provider to find out what is a fast Internet speed in your area. The bottom line is the type of computer you choose does not affect the speed of the Internet connection you receive from your ISP; however, it could affect how fast your Internet appears to be.
If the cable isn't in excellent physical shape, its data carrying capability goes down and your Internet speed will suffer. The same rule applies to its connectors and to the cable in Comcast's system as well.