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Your max theoretical would be 50MB/s on that connection, so 25MB is not terrible. I think there is some notable overhead on steam (check summing or encryption) as with my 1gbps connection previously I would never get past 100MB/s (800mbps).

I regularly max out at 70MB/s for other services, so the connection is actually pretty good IMHO

Speeds seem to vary based on the game and based on releases, interestingly. Some larger new-releases (Baldur's gate) were only hitting <100MB/s. I imagine it comes down to how loaded up the local steam POP is and maybe even the specific server hosting that game's files.

Aside from that release, almost everything that is a good size (>10GB) has gotten north of 100MB/s pretty regularly.

I get about the same; full link speed at 2Gbit. Steam will absolutely chew CPU to support this

I see a notable difference on a 7950X3D simply by messing around with the power/performance governors.

cable is shared media

Indeed, but no other service I use suffers from this to this extend.