Poor performance

I have a friend that is finding their ADSL a bit slow. They recently switched to Talktalk from BT. I'm not sure what their speed was like before but the BT wholesale checker suggests 4-8Mbps and they have noticed it isn't as quick as it used to be. Any ideas? Here are the modem stats:

ADSL STATISTICS

Mode: G.DMT
Type: ANNEX_A
Status: Showtime

Downstream Upstream
Rate (Kbps): 1664 kbps 896 kbps

SNR Margin (dB): 8.5 7.0
Attenuation (dB): 35.5 22.5
Output Power (dBm): 18.0 12.5

Super Frames: 170852 170852
RS Correctable Errors: 13244 2
RS Uncorrectable Errors: 0 4

HEC Errors: 0 2
Total Cells: 59781 63522
Data Cells: 649994 522274
Bit Errors: 0 0

Running in ADSL mode on a LLU line, when ADSL2+ should be faster, but the sync of 1.6 Mbps and still getting errors suggests something wrong.

Without stats before it is hard to know if the line is performing the same and its differences in DNS/congestion that is the issue or the move to the TalkTalk hardware at the exchange has meant a loose connection perhaps.

Should be getting over 8 Mbps from that line

OK. I've suggested they check/replace filters and try moving the modem to the master socket, but I guess they'll have to try their luck with Talktalk support over the phone.

TT phone support are notoriously unhelpful. Suggest they try the TT Community at www.talktalkmembers.com