See my original thread https://community.virginmedia.com/t5/Forum-Archive/As-requested-by-Jen-A-very-poor-http-download/td-...
and when this was first spotted
https://community.virginmedia.com/t5/Speed/Very-poor-HTTP-download-speed/td-p/3026879/page/13
The issue was never resolved and came and went but spent more time away that being present.
Anyway the Virgin throttling of single http thread is back. I upgraded to 350 service last Friday and the single thread performance has been limited since then.
The following points.
1) The shrub 3 is in modem mode
2) The tests are cabled
3) The tests have been done on multiple devices.
4) The time of day doesn't matter the throttling is present at all times.
5) The connection to the hub are tight.


I've included two different test results to show that it's not the test that's the issue.
Speedtest,net won't show the issue as it's multi threaded
It would be nice to have the issue finally fixed as been around two years on and off
Modem stats
Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID
1 211000000 -5.5 38 256 qam 10
2 187000000 -5 38 256 qam 7
3 195000000 -5.4 38 256 qam 8
4 203000000 -5.5 38 256 qam 9
5 219000000 -5.5 38 256 qam 11
6 227000000 -5.7 38 256 qam 12
7 235000000 -5.7 38 256 qam 13
8 243000000 -5.7 38 256 qam 14
9 251000000 -5.9 38 256 qam 15
10 259000000 -6 38 256 qam 16
11 267000000 -6.4 38 256 qam 17
12 275000000 -6.5 38 256 qam 18
13 283000000 -6.5 38 256 qam 19
14 291000000 -6.5 38 256 qam 20
15 299000000 -5.7 38 256 qam 21
16 307000000 -5.5 38 256 qam 22
17 315000000 -5.5 38 256 qam 23
18 323000000 -5.5 38 256 qam 24
19 379000000 -5.5 38 256 qam 25
20 387000000 -5.7 38 256 qam 26
21 395000000 -5.5 38 256 qam 27
22 403000000 -5.5 38 256 qam 28
23 411000000 -5.7 38 256 qam 29
24 419000000 -6 38 256 qam 30
Downstream bonded channels
Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors
1 Locked 38.6 33 0
2 Locked 38.6 68 0
3 Locked 38.6 50 0
4 Locked 38.9 38 1
5 Locked 38.9 40 0
6 Locked 38.6 40 0
7 Locked 38.9 46 0
8 Locked 38.9 36 0
9 Locked 38.6 50 0
10 Locked 38.6 44 0
11 Locked 38.6 48 0
12 Locked 38.9 46 0
13 Locked 38.6 54 0
14 Locked 38.9 56 2
15 Locked 38.6 52 0
16 Locked 38.9 48 0
17 Locked 38.9 57 5
18 Locked 38.9 55 0
19 Locked 38.9 105 0
20 Locked 38.6 123 0
21 Locked 38.9 113 15
22 Locked 38.9 161 0
23 Locked 38.6 190 0
24 Locked 38.6 233 0
Upstream bonded channels
Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID
1 25800000 3.875 5120 16 qam 4
2 32600000 3.8 5120 16 qam 3
3 39400000 3.75 5120 16 qam 2
4 46200000 3.725 5120 16 qam 1
Upstream bonded channels
Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts
1 ATDMA 0 0 0 0
2 ATDMA 0 0 0 0
3 ATDMA 0 0 0 0
4 ATDMA 0 0 0 0