@JamesTan Powerline will be always slower than direct wired connection and could be slower than modern mimo wifi even. If you can use a cable use it. To test your connection you can use tpPLC utility...

I have an issue with sustained data transfer rate on 8010P av1200 v1.0 being limited to only 80 Mbps independently of any conditions. I use adapters to connect my openreach fibre terminal in the...