Thanks for the suggestions from various folks, including YayZi Staff: much appreciated.
As I am a new customer I had no idea the current cutomer portal was being decomissioned.
Even the welcoming email took me to the portal.
No wonder my tickets filled in there have gone onto a black hole.
Regarding the methodology I’m using for the speed monitoring, here are a few more details:
I using a few DMS-107 2.5 G switches from D-link to ensure my link speeds are always at the highest speed.
I even temporarily used one to confirm the link between ONT (latest version installed by City Fibre yesterday) and the WAN socket of the EX820v are lighting up blue on the ports - indicating 2.5G link speed. So that is fine.
On the YayZi supplied EX820v router, I’m definitely using Lan 4 to attach to a WAVLink USB C Ethernet Adapter which runs happily at 2.5G
I have a RPi 5 connected to three networks: WiFi for VNC monitoring using wlan0, eth0 for a 1G link (to OpenReach via Fritz!Box) and eth2 (to CityFibre via the EX820v)
I can selectively down/up the eth0 and eth1 interfaces while still accessing the RPi remotely via RealVNC Viewer
Ignoring the overhead of web browsers, I can run speedtests selectively from the command line on the ethernet interfaces and get realistic ideas of the speeds.
I intend to repeat the tests at different times of day but I’m immediately seeing under performance.
With previous ISPs I know the CityFibre can upload at 1Gbps but I have never seen more than 622 Mbps via Yayzi
Example from around 10am this morning, probably the best result I’ve seen so far:
Howard@PI-5-4GB:~ $ speedtest
Retrieving speedtest.net configuration...
Testing from Yayzi Broadband (nnn.nn.nn.nnn)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Vodafone UK (Watford) [299.83 km]: 8.838 ms
Testing download speed................................................................................
Download: 1652.72 Mbit/s
Testing upload speed......................................................................................................
Upload: 622.05 Mbit/s
Maybe my expecations are too high?
I was sold on the possibility of multi-gig by Chris in the Customer Support Team when I made an enquiry earlier in the year and he confirmed Yayzi could supply a 2GB service.
Realistically I cannot see my self commiting to Yayzi unless the upload speed improves to levels closer to 1G (when I’ve previously had a symmetrical 1G service from a different provider, admitedly at higher cost point).
This smacks of bandwidth management to me and not a physical limitation on the fibre to my premises.