New lag when enabling RTX

I can confirm I've been experiencing the same issue, and that @MADLAD3718 solution worked for me.

I can't say for sure whether VSync was enabled or not before the update, but Minecraft with RTX was running at ~72 FPS before the update, then after the update VSync was enabled and the game was running at ~50 FPS, and by disabling VSync from the options.txt I got the ~72 FPS back.

I got somewhere with NVIDIA Control Panel -> Manage 3D Settings -> Power management mode -> Prefer maximum performance.

However it's still nothing like as good as it used to be.  My base area lags much more than it used too.  Turning the render distance or resolution down does nothing to improve it.

Edit: Forgot to mention - before I did this, my RTX 3080 was running around half speed when playing Minecraft.   Other users on reddit are also reporting their cards running at low speeds.

Affects beta 1.17.30.21

Can confirm I'm having this same problem. My GPU is an RTX 2070 Super. Would get a stable fps at a 24 chunks render distance when now I get an unstable 30fps at all distances with vsync on, fluctuating between 30 and 50 with vsync off. The GPU and CPU also are sitting at less than half usage, like Brook Chisnall reported.

RTX 3090 sits around 60-65% usage max and performance has dropped nearly half in all modes. Even supersampling to 6880x2880 failed to hit above 80% usage. Before the update, there was no bottleneck. CPU is an R7 5800x, so no slouch...

I can confirm I have this issue as well with an RTX 3080 Ti. I think it stems from Vsync.

With raytracing and Vsync enabled in the config file, I'm sitting at (a very microstuttery) 72 FPS almost all the time in the realm I have with my friends and I, and very low GPU usage. With Vsync disabled I usually throb between 120 and 180 FPS depending on the reflections, refractions and lighting conditions on screen from the raytracing. I use a 144 Hz 1440p monitor, and it looks like Minecraft is locking to either 144 FPS or 72 FPS. This is extremely annoying and I would prefer if vsync didn't lock to lesser multiples of my refresh rate, especially because having wild swings in framerate like this makes for an incredibly jarring gaming experience. Ridiculously strict Vsync is not something any other modern games exhibit, and a game like Minecraft definitely shouldn't have it either. Now to be clear, I'm not talking about Vsync inherently capping my FPS at 144 (I understand that's how Vsync works), I'm solely referring to how Minecraft is running ONLY either at 72 FPS or 144 FPS. If I'm running under 144, it would be preferable to have Minecraft running at whatever my GPU is putting out and not immediately drop to 72 FPS.

I would just leave Vsync disabled to get around this behavior, but I run into another issue. If I have Vsync disabled, on my other monitor Windows is excruciatingly laggy. YouTube videos are unwatchable because they either lag like crazy or are stuck on a single frame, typing in Discord is hitching and slow, and even the windows themselves lag and hitch if I try moving them around. This behavior doesn't exist with Vsync enabled, nor does it exist in other RTX games or benchmarks that run my GPU at 100%. It's only Minecraft.

All in all, it seems like the terrible performance both in game and in Windows with Vsync disabled via a config file not meant to be found by users stems from a similarly terrible implementation of vsync. Sorry to sound disgruntled here, but I just picked up this RTX 3080 Ti a few days ago and this performance is really disappointing.

I can confirm with my RTX 3070 GPU. When I am playing the game with ray tracing (24 chunks with DLSS) I am getting around 40-50 fps on average and the CPU usage (Ryzen 5 5600x) sits at around 10%-20% or so while the GPU is only at 57%. Since the CPU is only at around 15% or so utilization, it is not a CPU bottleneck. 

I have an rtx 2080 super my gpu was only going up to 50% usage but my game was lagging so I even disabled vsync in the options.txt file and it did nothing I do have an old cpu but it is still not using 100% of that either I am a creator on youtube and I want this fixed I have looked at other comments and for some reason vsync is always 1/2ing the framerate

It doesn't always halve the framerate. On my 240 Hz monitor I am locked to 80 FPS. Without vsync I can get up to 180 frames in open areas and more in the caves.

Same experience on 1.18.10.20. On 1.17, Prior to 1.18 betas, my Nvidia RTX 3070 handled RTX flawlessly - but now it's almost unusable due to lag and choppy frames. Both my CPU and GPU are at less than 10% utilization, often even below 5%, so it's likely some other bottleneck. Render distance seems to have either no or almost no impact - it's roughly the same amount of choppiness at 8 or 24 chunks.

Turning off vsync is a known fix for this, here is a link to an example PBR resource pack that implements the vsync option into video settings to make it much more accessible to be turned off. https://www.mediafire.com/file/ngisqn3mkjn4c44/Defined_PBR_v1.1.5.mcpack/file

Thanks for that information, MADLAD3718 - after testing it, it's true that disabling vsync resolved the issue completely - confirming that this is in fact a software bug. I hope it gets resolved soon.

Affects release 1.18.2, disabling vsync in game still results in around twice the framerate than the default does.