Thanks for the info, Jenny. I paused my download and tested the internet speed. Not sure if that was a true test though. I'm getting 493 kbps download. I'm supposed to get 640, and usually when I test, I get at least 525 kbps, depending on time of day.
The link you gave explained that Steam's downloads are measured in bytes, not bits, and that I should multiply the Steam download rate by 8 to compare to the kbps speed measurement. That was helpful. My Steam download vacillates from 0 bytes and then approx. 100, pretty much half and half. So, I guess if I average, and then multiply, I'm getting around 400. That's comparable to my 493 speed, but not as fast, and certainly not as fast as I should be getting.
Ah well. At least it's not as bad as I thought. I thought I was getting only 100 and less. Didn't know about the bytes vs. bits. How confusing!
I'll let it be for now, stick with Seattle, and not interrupt the download with tweaking. But I am going to check out another Steam server next time, maybe Vancouver ... just for grins.

Thanks guys for your info and suggestions.
Footnote Edit: Just wanted to say that the game finished downloading. Everything seems Ok. I'm going to do some exploring around the Steam Support site and learn a little bit more about how things work. I'm fairly new to Steam.