Nighthawk AX3000 mesh router satellite very slow.

I'm new to this kind of system so I'm very unsure how to go about things.

My main computer room has two setups on one desk, so the modem, main router, and one of the two satellites keeps both computers connected.

I wish I could plug both computers into the same router but there's unfortunately only one available Ethernet slot per box.

The 2nd satellite is about 20 feet away from the computer room and where my laptop connects to it. The connection exists, but the quality is abysmal, video quality quickly turns to mush, website features fail to load, images load in like it's 2006 and all that jazz.

I assume the reason is the distance between the two satellites, but if I were to move the first satellite closer to the middle to bridge the gap, only one of our computers can use the internet at a time.

How do I get around this?