In reply to a post by Pheasant:

The high-level speed test results may show similar for phone (via WiFi) and PC/laptop via cable connection but could be for very different reasons.

For example the BT SH2 only supports the 802.11ac WiFi spec rather than 802.11ax (WiFi 6) spec, so that alone will cap possible wireless speeds to well under 900 Mbps and more like 500 Mbps.

There is still very much a good chance that your PC even though it is relatively new could be in itself throttling network speeds as noted, due to issues that have been mentioned related to third party AV, anti-spam, firewall etc software. If when deactivated. Testing with a non-windows machine or booting into linux via a USB stick are usually good means to prove or disprove this.

Just trying to be pragmatic. It's not always straightforward diagnosing where the issue(s) lie with gigabit broadband.

That or the laptop is defaulting to WiFi even when ethernet is connected.

In reply to a post by nelix01:

My providers own test via their app shows over 900Mbps to the hub. Real world testing, including a Gbit Ethernet Connection never goes above 400Mbps.

This will boil down to the details of the test. A "multi-threaded" test - one that opens multiple connections concurrently - will show faster speeds than a "single-threaded" test - a single TCP stream. It also depends on exactly where the test server is located.

The maximum throughput of a single TCP stream is very sensitive to tiny amounts of packet loss and to the round-trip time. So if you test to a server which is further away, you'll get slower results.

If you're interested, the formula is here.

Example:
- test server is 0.01 seconds away (10ms round-trip time)
- packet loss is 0.0001 (1 in 10,000 packets)

Maximum throughput of a single TCP stream is:

1460 / 0.01 / sqrt(0.0001) = 14,600,000 bytes/sec = 116.8 Mbps

Thanks everyone. I suspect that I was being a bit greedy when testing and not seeing 900Mbps exactly. I am more than happy with real world performance of the service.

I don't know if this helps but, my Smart Hub from BT would only provide upto 450 Mbps download (I have the 900/110 service through BT themselves). However, switching over to my Linksys router gives me the full speed without issue.

Edited by simguy83 (Sat 19-Feb-22 16:16:33)