This trick (from XDA Developers) worked great on my HTC Touch Diamond 2. I doubled my browsing speed. This following tip involves editing the registry on your Windows Mobile phone. Get one of those free Registry editor at http://www.freewarepocketpc.net/ if you don’t have one already.
1. Locate the following key in the registry:
2. Create DWORD Value as below, and then add the following registry values:
Value name: MaxConnectionsPer1_0Server
Value data: 32
Value Name: MaxConnectionsPerServer
Value data: 16
3. Exit Registry Editor.
4. Soft Reset your phone
That’s it. To make sure to prove it did something, do a Internet speed test on your phone before and after registry setting.