Hello! As I receive many complaints from premium users regarding their low speed, I want to describe how this problem can be solved. Many users use only their browsers for downloading. With it your speed will always be low and what you need is a good download manager. It’s a special software which can download in many threads, which will tremendously increase your download speed.
Here http://en.wikipedia.org/wiki/Comparison_of_download_managers you will find many download managers. All of them are good. I can suggest you to use freedownloadmanager.org or flashget.com. If you are using Mozilla Firefox then you may install a plugin called DownThemAll!
PS. Just want to add that the speed for premium users is absolutely normal. And during this month there will be a server’s upgrade which will bring us more stable download speed even in peak hours and at weekends.