I live outside of the UK and my download speed via the local ISP is 8Mb with a latency of 25-30 ms. If I use a VPN to stream video from the UK, the download speed drops to 5.5 - 6 Mb and latency to 90 - 105 ms which is fine.
My modem is a Thomson TG585 v7 with 4 outputs. I have connected one of these outputs to a Linksys WRT54GL router which is set up with DD WRT and Open VPN.
This works fine but with one small problem which I hope you might help me to make sense of. (By the way my VPN supplier tried to help but was unable to even though we set up remote assistance).
The problem is that although latency remains at 90-105 ms the download speed drops to 2.4 - 2.6 Mb. So I increased my local ISP's download speed to 12 Mb thinking that it would work through and up the Open VPN speed, but no. it remains stubbornly at 2.4 - 2.6 Mb. (normal VPN did increase to 8 Mb.)
I can understand that the latency will remain the same but I am wondering if the Linksys router has a top limit? Perhaps that is the wrong term but as a silver surfer any answers please put it as simply as you can.