I would sure appreciate some guidance here. I try to keep up but I can get over my head pretty quickly so please bear with me. My problem is that, for well over a year, I have been paying Cox for Gig...
Sorry for the delay but I wanted to follow up with an update on what I've done. In review: I have Cox gigablast service as well as their Complete Care Support Package. For a very long time I've put up with extremely slow speeds but finally called them and they sent a tech out. He claimed the coax running into my house was bad and replaced it. He showed me on his guage that he was getting 950mbps into my modem and about 900gbps out. But when I ran the speed test on my Lenovo desktop connected via ethernet directly to the modem and ran speedtest.com I got only about 250. When I connected my Google Mesh router, the Google Home app reported it was seeing 850gbps in but the four other points are only seeing about 30 to 50 and speedtest on my wireless devices reflect similar results. The desktop connected via ethernet Cat 7 flat cable reports the same 250 whether connected directly to the modem or to the Google router. The Complete Care tech watched all of this... shrugged and said there must be something wrong with my equipment.
Since my OP, I completely took apart my network and added back each device one at a time performing speed tests on each as I did. I got the same results. No improvement.
Then I read that sometimes a Ring alarm system or doorbell can gum things up so I unplugged my system and restarted each device on the network one at a time with a speed test on each. No improvement.
I have now signed up for the TMobile 5G home internet trial. I just received my device and have only had time to play with it for a few minutes. and then only with one wireless device. Mixed results. I'll play with it a bit more soon but I'm not optimistic about anthing anymore.
My next step is going to be to set up an appointment with a local home networking repair shop which has a pretty good reputation in our small town. He holds degrees in both EE and CS. I just want to do business with a company that will "fix their customer" rather than simply trying to prove that the customer's problem is not their fault. I know what a slippery slide that can be for a business but the fact is that I'm paying Cox for their top tier service and their top tier support and yet I have to wait 15 seconds for a Facebook photo to load and they offer me no suggestion on how to proceed.
I'm always open for additional ideas but will also post the results of my experience with both TMobile and the local repair shop.
Connect the desktop direct to the modem with a cat5E cable, and reboot into safe mode with networking and run the speed test. Believe it or not, first, I have seen speeds degrade using cat 7 cable, and second, I see computer speeds degrade because of background software, Booting into safe mode with networking will eliminate that possibility. When I was at Cox, we used to do that all the time with customers, and one time when they were getting 140 or so, booting into safe mode with networking, jumped to 925, booted into normal modem back to the 140's.