Comment on Why do low framerates *feel* so much worse on modern video games?
tomkatt@lemmy.world 3 weeks agoI don’t understand all the technicals myself but it has to do with the way every pixel in an OLED is individually self-lit. Pixel transitions can be essentially instant, but due to the lack of any ghosting whatsoever, it can make low frame motion look very stilted.
Also the inherent LCD latency thing is a myth, modern gaming monitors have little to no added latency even at 60hz, and at high refresh rates they are faster than 60hz crts
That’s a misunderstanding. CRTs technically don’t have refresh rates, outside of the speed of the beam. Standards were settled on based on power frequencies, but CRTs were equally capable of 75, 80, 85, 120Hz, etc.
The LCD latency has to do with input polling and timing based on display latency and polling rates. Also, there’s added latency from things like wireless controllers as well.
The actual frame rate of the game isn’t necessarily relevant, as if you have a game at 60 Hz in a 120 Hz display and enable black frame insertion, you will have reduced input latency at 60 fps due to doubling the refresh rate on the display, increasing polling rate as it’s tied to frame timing.
This is why, for example, the Steam deck OLED has lower input latency than the original Steam Deck. It can run up to 90Hz instead of 60, and even at lowered Hz has reduced input latency.
Also, regarding LCD, I was more referring to TVs since we’re talking about old games (I assumed consoles). Modern TVs have a lot of post process compared to monitors, and in a lot of cases there’s gonna be some delay because it’s not always possible to turn it all off. Lowest latency TVs I know are LG as low as 8 or 9ms, while Sony tends to be awful and between 20 and 40 ms even in “game mode” with processing disabled.
Standards were settled on based on power frequencies, but CRTs were equally capable of 75, 80, 85, 120Hz, etc.
That’s why I specified 60hz :)
I see that you meant TVs specifically but I think it is misleading to call processing delays ‘inherent’ especially since the LG TV you mentioned (which I assume runs at 60hz) is close to the minimum possible latency of 8.3ms.
True, but even that is higher than the latency was on the original systems on CRT. My previous comments were specific to display tech, but there’s more to it.
Bear in mind I can’t pinpoint the specific issue for any given game but there are many.
Modern displays, even the fastest ones have frame buffers for displaying color channels. That’s one link in the latency chain. Even if the output was otherwise equally fast as a CRT, this would cause more latency in 100% of cases, as CRT was an analogue technology with no buffers.
Your GPU has a frame buffer that’s essentially never less than one frame, and often more.
I mentioned TVs above re: post processing.
Sometimes delays are added for synchronizing data between CPU and GPU in modern games, which can add delays.
Older consoles were simpler and didn’t have shaders, frame buffers, or anything of that nature. In some cases the game’s display output would literally race the beam, altering display output mid-“frame.”
Modern hardware is much more complex and despite the hardware being faster, the complexity in communication on the board (CPU, GPU, RAM) and with storage can contribute to perceived latency.
Those are some examples I can think of. None of them alone would be that much latency, but in aggregate, it can add up.
The latency numbers of displays ie the 8-9 or 40ms include any framebuffer the display might or might not have. If it is less than the frame time it is safe to assume it’s not buffering whole frames before displaying them.
Your GPU has a frame buffer that’s essentially never less than one frame, and often more.
And sometimes less, like when vsync is disabled.
That’s not to say the game is rendered in from top left to bottom right as it is displayed, but since the render time has to fit within the frame time one can be certain that its render started one frame time before the render finished, and it is displayed on the next vsync (if vsync is enabled). That’s 22 ms for 45 fps, another 16 ms for worst case vsync miss and 10 ms for the display latency makes it 48 ms. Majora’ mask at 20 fps would have 50ms + 8ms = 58 ms of latency, assuming it too doesn’t miss vsync
moody@lemmings.world 3 weeks ago
Essentially, the speed of the beam determined how many lines you could display, and the more lines you tried to display, the slower the screen was able to refresh. So higher resolutions would have lower max refresh rates. Sure, a monitor could do 120 Hz at 800x600, but at 1600x1200, you could probably only do 60 Hz.