First, install Internet Download Manager. Don’t forget to close all browser because Internet Download Manager will integrated with your browser after installation. I suggest you use Firefox latest version.
Okay, after you do that, run Internet Download Manager and go to Downloads -> Options. A new window will show up and choose “connection” tab. Now you just change max. connection from 8 to 16 and Connection type to LAN 100MB/s. Then click OK.
Now, you just search for the file you want to download and see how fast Internet Download Manager download that file.
Note : This tips not for Rapishare