I'm only speculating on a cause and effect. The last day or two my N900 had also been unusually sluggish and slow to respond. After updating a couple of widgets today, it is back to its' normal self.

It may just have been a mis-behaving widget, or a combination of these tweaks, widgets, power-kernel, updated modest, updated hildon-desktop, etc. Not exactly running a stock N900 here. If it continues to behave, I'll just chalk it up to a fluke.

Wouldn't be half the fun if we couldn't tweak the heck out of it.