It actually shows up around 90 kbps. So kilobytes.... a lot of websites pull up initially with a message "Hmmm… can't reach this page", and it takes a second for them to load or I have to refresh them and I get lots of error messages on sites that require input (expedia, ebay, etc.) or the pages just hang for awhile and then go to a gray screen.  the download speed usually shows up as 600+ Mbps. 

I have the top tier service (the gigablast one)

YOUR INTERNET SERVICE
Internet Gigablast
Up to 1 Gbps download
Up to 35 Mbps upload
1.25 TB (1,280 GB) data plan

Can you post a link to your speed test? Also, what are your signal levels? To see them go to 192.168.0.1 > User:admin password:password(unless changed) > Connection > Cox network. Looking for the downstream and upstream power levels. You can either upload a screenshot to Imgur or see here how to post pictures. Overall your downstream should be +5 to -5dB with a SNR above 35. Your upstream should be below 50dB.

Can you run a speed test on a wired/ethernet system?

I had assumed OP is on ethernet since they are getting 600Mbps down however it is a good thing to check.

speed test i've been using is: Cox Internet Speed Test | HighSpeedInternet.com