[Sharlin]

People have varying sensitivies to flicker, but the refresh rate of even basic cheap CRT monitors was something like 75 or 85 Hz, which most people found essentially flickerless. Higher-end monitors would go up to 100 or 120 Hz, one of the several ways that for some use cases they were superior to LCD displays for quite a long time. Televisions, at 50 or 60 Hz, were pretty bad of course.

[theragra]

It was fine back then, but now I can't tolerate even a minute of CRT TV or low frequency monitor.

[msephton]

The default flicker rate on this shader is 0.01 which is about 85Hz. Indeed it's almost imperceptable but adds a lot to the feel.