Cydia refreshes your sources too slowly? Then you can try an useful package: AptGUI. This package is based on apt-cache, apt-get and dpkg. This was developed by Philippe97 and works great.
Just open it, it will refresh your sources fast and then you can go in Cydia and download the new packages or updates.
This package is on his repo: http://apt.philippe97.com/ and it’s free :).
Try it, use it.