There is a website called Boxopus which downloads the torrents for you and stores it in private cloud. No torrent client is needed anymore. Now you can download torrent file using your existing download manager with full speed. IDM or any other download manager can be used to download the torrent file. As IDM is the best download manager available in the software market, so it gives the best performance. Boxopus also guarantees that you will be always anonymous and your files will be encrypted. No one else besides you can access them. It uses SSL encrypted channel for total anonymity.
To start with Boxopus, first you have to create an account which is absolutely free. For more functionality, Boxopus offers a pro account too.