Slow upload - only one PC

[kynan]

I have a strange issue where my PC upload is recently really slow. 

using speed test my PC (Wired connection) 

900 Mbps download

10ish Mbps upload

multiple wifi devices are 

600 Mbps download

600 Mbps upload

I have unplugged modem and reset my PC. Tried different ethernet cables. Reinstalled network adapter. 

Please provide some ideas! Thanks

[Smario]

which modem T3200M or the NH20A modem are you using?

[kynan]

NH20A and a wifi 6 booster.

[kynan]

The modem is set up downstairs, wifi 6 booster is upstairs. The PC is hardwired into the wifi 6 booster.

[Smario]

you want to connect the pc to a unmanaged switch, then run a cate 5e or 6 or 6e network cable from the unmanaged switch to the modem,  10gb port on the NH20A modem.

[FuzzyLogic]

When you do the Speedtest possibly try a different server. I have seen considerably different results depending on the server used.

[Smario]

Other option , you could run a coaxial cable from the NH20A modem to a wall outlet to wall outlet  or using ScreenBeam Bonded MoCA 2.0 Network Adapter for High Speed Internet, Ethernet Over Coax - Starter Kit (Model: ECB6200K02)