Good to know. I admit I haven’t seriously used anything but a good quality monitor for the last few years, and simple research suggests PWM is only likely to cause visible artefacts on LED backlights (TFTs are slow enough that they don’t dim completely when cycling quickly), which only became popular fairly recently, so that might account for my being unfamiliar with the probelm. Certainly there are still some types of patterns or of content which when scrolling look awful on LCDs and I understand that PWM (though I didn’t know that was the specific term) can be part of the problem there. Yet for reference, in my earlier teen years and before I always found it hard to cope with CRTs at 60Hz (it rapidly produced migraines, so I used polarising sunglasses to help; 80Hz was barely OK, 90Hz was acceptable and 120Hz which I could use on one monitor was lovely).