questionable download speed

[Battius]

Sky service checker says I have 483MB download speed, but the Which speedtest says only around a 100MB download speed. service seems sluggish so I'm inclined to believe Which not Sky. Tested using a ethernet connected laptop too.
I'm on Sky Full Fibre 500
Any ideas?

[JimM1]

@Battius Was every other device disabled when you did the Ethernet test, and was your laptop capable, not running on battery also!

Use either the two test's below and post up a capture off your result's.

https://www.thinkbroadband.com/speedtest
https://speed.cloudflare.com/