Wait, but you get 63MB/s down from steam?
My internet is pretty good, I can easily saturate my (rather dated) WiFi at about 30MB/s. But Steam downloads are extremely slow for me (can't remember the numbers but much less).
I always assumed Valve themselves were just stingy with bandwidth. Something else funny going on?
It might have detected the wrong country/city for you. Check Settings -> Downloads -> Region
Otherwise it's just your WiFi being patchy. I think Steam is doing "friendly" bulk download, it slows down before the connection is saturated, to avoid disconnecting your wife/mum/siblings watching Youtube or on a videoconference.
For me it varies a lot. Sometimes I get 800 Mbit and sometimes like 80 Mbit. Mostly closer to 800, tho.
> Wait, but you get 63MB/s down from steam?
I usually (but not always) saturate my downlink with Steam downloads... even back when I was a Comcast customer and paying for ~180MB/s (~1500mbit/s) asymmetric service.
I believe that I have noticed that smaller games (~a few hundred MB or maybe a GB or two) will download quite a bit slower than large games, but I'm not very confident in that observation.
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Peering between your ISP and Valve is likely saturated.
Considering Valve has an incentive to make downloads fast (= more revenue), it's likely your ISP is being stingy in this case.