BTW a useful disambiguation:RealNC wrote: ↑12 Sep 2024, 10:46Processing lag of modern gaming monitors ("modern" meaning made in the last 8 years or so) is usually less than 2ms. When LCD displays first went mainstream, it was common for them to have latencies upwards of 20ms.
As I said before, Rtings measures lag at the middle of the screen. A 60Hz CRT will also have 8ms of latency. 0ms at the top, 8ms in the middle, 16ms at the bottom. Both a CRT and an LCD will need about 16ms to display the whole frame from top to bottom. The difference is the delay before the very first scanline at the top is shown. With CRTs, that delay is virtually 0ms. With modern displays, it can be as low as 0.5ms, or as high as 2ms. Which is very little compared to old LCDs, especially TVs or non-gaming monitors.
"Processing lag" = a tapedelay latency (lag between GPU scanout and photons-emitting scanout)
"Scanout lag" = lag differential between first and last pixel refreshed, when using VBI-relative lag stopwatch.
"Pixel response lag" = the time it takes for a pixel to change color. Usually humans will see the first photons after the first GtG10% and especially by GtG50% in the curve. Sometimes measured along with processing lag.
Not all pixels refresh at the same time on a display, CRT, LCD, OLED, etc. www.blurbusters.com/scanout
Sometimes they will illuminate at the same time (e.g. strobe backlight, plasma pulse, PWM flash, etc) but they still primed or refreshed pixel-at-a-time in the dark. Also laws of physics doesn't allow transmitting all pixels simultaneously over the cable, so you've got a cable scanout (GPU port scanout) and a panel scanout (which leads to photons emitting from screen, after a GtG pixel response delay). Usually in sync (top to bottom sweep) on HDMI/DP cables connected to modern low-lag panels.
