I live in NN4 and can regularly achieve 18Mbps+ downloads. I really don't check it often enough to say it never slows down to the 12Mbps level but I've never noticed it do so. I did have some issues when it was first installed a few months back but they cleared up for some reason or other.
Here is my tracert so you can check against your own..
Quote:
C:\Users\Mark>tracert bbc.co.uk
Tracing route to bbc.co.uk [212.58.224.138]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms tomato.router [192.168.1.1]
2 16 ms 17 ms 7 ms 10.nn.nn.nn
3 21 ms 33 ms 11 ms nrth-cam-1b-v100.network.virginmedia.net [213.10
4.142.129]
4 11 ms 8 ms 25 ms nrth-core-1b-ge-012-0.network.virginmedia.net [1
95.182.178.209]
5 11 ms 7 ms 16 ms nrth-bb-1b-so-511-0.network.virginmedia.net [212
.43.162.241]
6 26 ms 10 ms 9 ms tele-ic-1-as0-0.network.virginmedia.net [62.253.
184.2]
7 23 ms 42 ms 25 ms pos6-1.rt0.thdo.bbc.co.uk [212.58.239.237]
8 11 ms 11 ms 11 ms 212.58.238.153
9 9 ms 9 ms 11 ms virtual-vip.thdo.bbc.co.uk [212.58.224.138]
Trace complete.
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(ping all over the place as the connection was in use when I did the tracert)