Steam was running in Compatibility Mode on my Windows 7 machine... I'm not sure why. I put a stop to that, though I had to edit the registry to do so.
Performance on that same machine had become sluggish and choppy, and the cause turned-out to be the ASUS-provided drivers for my ASUS PCE-13N wireless network card; I've since installed Ralink drivers, as the card is built around a Ralink RT2790T chipset. All runs smoothly now.
Still regarding the same machine, I never could get all three sticks of RAM running together stably at 2000MHz, despite an extensive discussion with a G.SKILL technician. They offered to allow me to RMA the whole kit (2000MHz, 9-9-9-24-1N) for something a little more tame (1600MHz, 7-7-7-21-2N), but I tested the current kit at both 7-7-7-21-2N and 9-9-9-24-1N at 1600MHz, and the performance difference was negligible; I'm talking a latency difference of ~3ns (61ns vs. 64ns) and a bandwith difference of ~20MB/s (67.66GB/s vs. 67.68GB/s). Given that the RMA process would leave me without a functioning computer for a few weeks and neuter my upgrade path, all for a trivial speed increase, I think I'll be keeping the 2000MHz RAM and running it at lower frequencies.
So all is now well, and I am at peace :)
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