[WhiteDragon]

If you already did function profiling on everything and analyzed /stats when the problem was happening, I imagine this would be a problem Stefan would have to take care of.

It's possible there is something else on the machine making iowait go up and therefore artificially boosting all the "CPU usage" percentages on the GServer.

It could also be one of your scripts doing too much I/O. Is your memory usage too high? Perhaps it's swapping.

There are a number of things that could be happening, but I guess it'll be tough to tell without someone with access to check these things coming.