Did you turn the following OFF?
Read https://www.howtogeek.com/224981/how-to-stop-windows-10-from-uploading-updates-to-other-pcs-over-the-internet/
Also, just yesterday a relative showed me their slow PC. Nothing was wrong as it was a Dell laptop with 2GB RAM.
After having my desktop back to my place, I notice that internet connection is slow. The router is fine. According to fast.com, the download speed is 673kbps. So, I run Dell System Detect. After one night, it is still running in the phase of Running Dell System Detect. Something isn't right. How to approach those problems?

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