All my iOS related downloads (firmware updates and app downloads) are incredibly slow in iTunes. Right now, a single 70 MB app is an estimated 3 hours download making the transfer rate lousy 52 Kbit/s on an 8 MBit/s ADSL.
When I download my .ipsw firmware updates (400 - 600 MB) in a browser from a direct download link (appldnld.apple.com) the transfer rate is normal though.
I suppose my iTunes is connecting to geographically "wrong" servers. Changing Google's DNS servers (184.108.40.206 / 220.127.116.11) to my ISP's DNS servers doesn't solve the issue.
Is there a way to improve iTunes download rate?