The speed of downloads on your Mac is dependent on a number of different things. The type of Internet connection you have is one of them. If you have a dial-up connection, it is much slower than a broadband connection. Even broadband connections have different download speeds. DSL download speeds vary from 1.5 to 9 Mbps, while cable modems can be faster or slower, depending on how many people share the connection. To speed up your downloads on a Mac, you have a few options.
Change your Internet connection. This is one of the only sure ways to speed up your downloads on a Mac. If you have a cable connection, consider switching to DSL. Even though cable can be faster, the more people connected in a given area, the more bandwidth is used and the slower the download speeds are for you. While DSL is constant, since you are not sharing your connection with anyone else, if you have DSL, consider upgrading the number of Mbps you can download. If you go from 1.5 to 3 or 5, you will notice a difference.
Open ports on your computer. This will allow the ports that you are downloading on to have more access to your computer and therefore download more quickly. Open "System Preferences" in the Apple menu.
Click on "Sharing" and select "Firewall."
Click "New" and select "Other" from the drop-down menu. Input "6881-6889" in the "TCP Port Numbers" and "UDP Port Numbers" boxes and add a description. Press "OK" and check the new port to open it.