Slow 3G / H speeds on custom ICS ROM

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http://forum.xda-developers.com – Hello, I was wondering if someone could help me help with a data sleep issue? Using 4ext I did a full wipe of the dalvik cache, battery and factory/data and installed Fallout v5.0 fresh. The phone is running like a dream, but my data speeds when connected via 3G or H are very slow. I'm on the GiffGaff (O2) network and had this issue since flashing an ICS custom ROM. Using speedtest.net's app I did a test while on H with 5 bars of signal and the results were: Down: 220kbps Up: 716kbps Installing setdnd and changing the DNS to OpenDNS changed my speeds to: Down: 1488kbps / (HowTos)