Well, that's it then. It's bad enough that there is no fix (although I'm not seeing the lagging myself) but what's worse is that we still don't have any certainty as to what the cause is (not precisely), whether some notebooks are affected and some aren't, or why some (like mine) seem to be unaffected.
It's the uncertainty that annoys me, of not knowing the real extent of the problem. Even if FSC are not going to do anything to correct it, they could at least have given us more information, such as detailed results of the testing they did.