Fast speed when direct from modem, slow over wifi/TP Link

[Pete0151]

My main PC gets 870 Mbps (yay!) however everything else is slow (around 30-40 Mbps) this is both wifi and if I use a TP Link. I understand wifi will be slower however I did not expect such a drop, I may as well have stayed with a slower package. More significant though, I thought a TP Link would help much more but it gives the same as wifi which make me suspicious. Can anyone make any suggestions please?

[jamesn123]

Hi @Pete0151 

By 'TP-Link' i assume you mean Powerline adapters/home plugs. TP-Link is a brand/manufacturer not a product. 

Powerline adapters are limited by the quality & distance of your homes electrical wiring so that may be the cause of the speed drop over the devices. Additionally if you bought ones with built in WiFi these can cause slower connects as it tries to mesh with your Sky hubs signal.