Thin client slow, but laptop intent speed fine

So me and the gf are working from home, my laptop is working fine over wifi, her thin client is really slow over Ethernet.

It's fine art her parents place who have fibre, I only have Ultra VDSL 20 down 10 up.

Is that the reason for it to be slow or do you think it's something else?

Tried a different cable, no different.

Any suggestions would be great. Thanks