A new PC does this. It's annoying but for now turn the following off while you explore what else it can be.
Read https://www.howtogeek.com/224981/how-to-stop-windows-10-from-uploading-updates-to-other-pcs-over-the-internet/
Be sure to check with Lenovo's web page AFTER YOU TURN THAT OFF (LINK ABOVE) AND REBOOT for driver updates to the WiFi.
If you have McAfee and some other suites they can pummel speeds in some cases.
I just bought a brand new Lenovo ThinkPad t470 and out of the box it has <1 mbps download speed on my schools Wi-Fi, which normally averages 120 mbps. I don't have time to return it as I'm currently enrolled in a coding class. How can I fix this?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic