Windows 7 is great, but on my machine every once in a while, like after a couple of hours of working, the interface starts to lag. Nothing big, probably just 100 milliseconds or something, but it is noticeable, and especially when watching movies. Don’t really know what it is exactly, maybe something with drivers or some program that slows it down, but there are numerous reports of this out there on the internet. And this thing is really annoying, because once it has started, EVERYTHING is lagging, all the windows and everything that happens on the screen.

This has nothing to do with too little memory or some process running in background. The lag would appear even when processor usage was on 0-5 percent.

So, basically, the workaround for this: once it starts to lag, switch a window with Windows+Tab button. (To open that 3D taskswitcher that came in Vista). Once you have done that, the lag is gone.

It is sure strange, seems like there is some bug that starts when something gets overrun, and the 3D task switcher resets it to make everything run normally again.

This isn’t really a fix, just a workaround, but searching the internets gave me nothing, and this solution is still viable. So here you go people, if somebody stumbles across this article with the same lag problem, there you have a solution.