So for those having performance issues on hyperthreaded Intel CPUs or Bulldozer AMD CPUs, there’s been a lot of talk about a Windows 7 power saving feature called Core Parking. Basically, when the OS determines a CPU isn’t needed, it “Parks” it. The problem is that when the CPU is needed again, it first needs to unpark/wake up, which can cause microstutters and other sudden dips in framerate. This feature has been much maligned, from what I’ve seen, since idle processors take very little power anyway and really isn’t useful at all in desktop environments (where you’re not trying to maximize battery life, like a tablet or notebook).
From what I understand, this tweak isn’t possible on Core2Duo machines (not sure on Quadro), but applies to all AMD Bulldozer CPUs and the i3/5/7 line from Intel. There’s a related Windows hotfix for the AMD CPUs, since I’m not on an AMD system I don’t know if this hotfix is downloaded automatically or if you have to grab it yourself.
If you’re interested in trying this out, just to be on the safe side I would recommend created a Restore Point in Windows, which will let you roll back the registry if you need. If you don’t know how to create a restore point, it’s pretty easy. Just type “Restore Point” in the Start Menu and you’ll see an option for “Create a Restore Point”, click “Create” at the bottom of the dialog, and give it a name.
You can manually tweak your registry or run the powercfg command-line utilty to disable core parking, but the easiest way is to just grab this tool (instructions provided in link, but it’s simple).
As GW2 is currently unavailable, I haven’t been able to test the effectiveness yet, but from some Google searches it looks like this has been a pretty decent performance increase in other games, like Battlefield 3, and eliminates microstuttering and brief dips in FPS in a lot of cases. This page has a small benchmark that showed some pretty significant gains running WinRAR (which is CPU intensive).
As with all things of this nature, if you’re not comfortable making tweaks to your system, don’t. I’ve disabled it on my system so far with no adverse effects, but I haven’t run it through any tests yet. The whole Core Parking thing was brought to my attention via a link to this page on Reddit.