The power levels you posted look OK, all within the recommended range. A lot of post RS errors on some channels but they may be historical, has the hub been restarted recently? If not it might be worth restarting it and seeing if the post RS errors start increasing rapidly.
Are you using a wired Ethernet connection direct to the VM hub or a wireless connection?
Are you seeing the lag all day or only at peak times (typically 4pm-11pm weekdays and weekends)?
Have you noticed any slowdown in your download or upload speeds since you started experiencing the lagging?
Disclaimer - I don't work for Virgin Media. I'm just another VM user trying to help out so my answers may be wrong If my answer solves your problem please mark it as helpful as it may help others My setup: Vivid 200 Optical fibre with Superhub 2 in modem mode connected to a Netgear R7000 router. Telewest/VM user since 2001.
I didn't reply because since posting I have received new kit.
Upgraded from a hub 1 to a hub 3. Running that in modem mode connected to my netgear router.
Lag appears to have gone but its too early to say for definite. I have a BQM set up monitoring and I have quite a lot of yellow spikes showing. I don't seem to be able to access any hub 3 data when it is in modem mode? But heres the BQM graph.
You likely have to ask netgear to allow it or add the code to do it when you enabled the ICMP.
most ICMP is type 8 the timestamps are type 13 the info it adds is a 0- 86399999 ms over 24hours (or at least thats how it should be) there are a number of things about using it to understand it to be reliable like how reliable the packets are processed by each end device and other stuff like clock drift.
You can do a ping -n 200 188.8.131.52 but it tells you nothing of what the delay was but timestamps if used correctly can but only if you start off with reliable start point and offset.