I have Shaw Internet 600.

When directly connected to the router/modem I get 600mbps. However, when I connect to a switch then to a different computer I'm only getting about 200mbps. Previously this wasn't an issue.

I've tried running the speed test in safe mode. I've tried swapping out the switch for a different one. I'm still only getting 200mbps for some reason.

Any other ideas? I'd swap the Ethernet cable running from the router to the switch, but it goes through a wall and is 50FT long and I don't have a spare, It's not something I want to do unless absolutely necessary as it's a pain to do.