On 802.11 b/g/n I never see much over 60 so yours did OK. But and this is a biggy, there is a lot of traffic and neighbors on the 2.4GHz band so it won't take much for the speed to plummet today.
For Windows 10 you need to find all those PCs and turn the next thing off:
https://www.howtogeek.com/224981/how-to-stop-windows-10-from-uploading-updates-to-other-pcs-over-the-internet/
Sorry but I can't guess which Modem and Router package you have here. There are folk that didn't take Spectrum's modem upgrade and are very upset. I can't help those folk.
Which modem+router did Spectrum supply you?
I have Spectrum for my internet. They provide 100Mbps to my home. I was getting up to 75 Mbps and was satisfied with it. Something has pushed me back to about 20Mbps and so far Spectrum is not helping me. I had a tech helping me and he seemed to know what he was doing and I let him access my computer but he was no help. My computer has a 10/100/1000 Mbps integrated network card and a wireless 802.11 b/g/n Wi-Fi card. I have the modem that was put in by Spectrum and from that modem there is a network wire to my Vonage phone router. From the Vonage router there is a network wire to the Wi-Fi card on the back of my computer and another wire to my Smart TV and another wire that connects to my Netgear Nighthawk WiFi router for my home WiFi. I don't know much about networks but I thought that if I connected a wire from the back of the Spectrum modem directly to the back of the computer which would effectively eliminate all the other routers and wiring that I now should now get a good download speed. That didn't work. What was strange is that the internet connection icon in the lower right corner of my screen changed from reflecting a wired connection to a wireless connection and my internet speed went down more. Can anyone make any sense out of this or help me do a few things to possibly get back to 75Mbps that I had before?

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