Distant Horizons•6mo ago

Consistent Stuttering - Unable to resolve

Hey guys, I'm setting up a DH modpack for the first time to see if I can get it working and restore my childhood love of Minecraft. I'm tweaking with settings and trying to make it run well, but despite my best efforts, the game consistently stutters and freezes.

32 Replies

PandemicOP•6mo ago

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PandemicOP•6mo ago

Here are my launcher arguments: -XX:+UnlockExperimentalVMOptions -Xms8G -Xmx8G -XX:+UnlockDiagnosticVMOptions -XX:+AlwaysActAsServerClassMachine -XX:+AlwaysPreTouch -XX:+DisableExplicitGC -XX:NmethodSweepActivity=1 -XX:ReservedCodeCacheSize=400M -XX:NonNMethodCodeHeapSize=12M -XX:ProfiledCodeHeapSize=194M -XX:NonProfiledCodeHeapSize=194M -XX:-DontCompileHugeMethods -XX:MaxNodeLimit=240000 -XX:NodeLimitFudgeFactor=8000 -XX:+UseVectorCmov -XX:+PerfDisableSharedMem -XX:+UseFastUnorderedTimeStamps -XX:+UseCriticalJavaThreadPriority -XX:ThreadPriorityPolicy=1 -XX:AllocatePrefetchStyle=3 -XX:+UseZGC -XX:AllocatePrefetchStyle=1 -XX:-ZProactive I watch in debug and see that my memory hits 8GB and that is what causes the stutter. I used to use 16G but the stutter still occurred and was worse when it maxed out. I'm on Aggressive mode, 192 LOD Render distance, High quality preset. Standard video settings is 32 render distance, 16 simulation distance. PC specs: Ryzen 5900X 12 core (currently running in 12 thread mode to improve single core performance) 128GB DDR4 3200MHz memory RTX 4070ti All minecraft files are installed on a PCIe4 M.2, so file load time is not a concern.

Yeshi•6mo ago

Vanilla rd should probably be a max of 16 ish. If you're running 32 vanilla comfortably, you can likely push above 384 LODs. Something else to consider is using the nightly from #links-n-downloads as the memory usage is far lower (and performance is also much better)

PandemicOP•6mo ago

I am using the nightly build. I will push to 384 now and LYK if performance changes.

Yeshi•6mo ago

Aggressive CPU load could also be it tbh. Try decreasing this to low impact and see if anything changes

PandemicOP•6mo ago

OK, 384 has zero FPS performance but my stutters happen more frequently

Yeshi•6mo ago

Aggressive is good for overnight AFKing

PandemicOP•6mo ago

Balanced has actually worse stutters Happen less frequently and for longer Can I kick my RAM up? I have 128 to play with

Yeshi•6mo ago

Old tasks don't stop immediately when changing CPU load settings, give it a moment to recover Generally you should stick to low impact unless you have 8 or more cores (unless AFKing)

PandemicOP•6mo ago

Would I see better performance if I swapped my CPU back to 24 thread mode? I'm in 12 thread mode atm

Yeshi•6mo ago

Probably Distant generation scales with more threads really well While you're at it crank the CPU load back to aggressive and increase your allocation to 16gb More worldgen threads = higher allocation rate What CPU do you have?

PandemicOP•6mo ago

Ryzen 5900X

Yeshi•6mo ago

Very nice. Recently built a Ryzen 7600 system myself

PandemicOP•6mo ago

I would be in a 7000 system myself if I didn't have to completely replace mobo and ram too Those new ones are phenomenal Ok let me try two things and get back to you. I am going to switch CPU back to 24 thread mode and increase my RAM to 16, and then to 32 if I do not see improvement. After 5 minutes testing I will get back to you Thank you!

Yeshi•6mo ago

Np Try increasing to 24gb first. 32 will lead to bigger spikes from GC

PandemicOP•6mo ago

Gotcha Okay, I came back in 12 core, 24 thread mode, 16GB. Stutters are almost nonexistent, but my overall FPS tanked by ~20 frames. Went from relatively smooth 60-70 to around 48. Seeing how it handles memory, I think maybe if I revert back to 12 thread mode, kick up to 24GB, that my issues may go away.

Yeshi•6mo ago

Best bet is probably AFKing overnight and disabling distant generation when you wake up You can comfortably reduce the CPU load and memory allocation whenever it's done. For 384 LODs you can get away with 4gb allocated but go for 6gb to have a buffer

PandemicOP•6mo ago

OK, I found the sweet spot. I'm running in 12 thread mode, 24GB allocated. Game is stable between 50-70 FPS, and stutters are minimal. Aggressive mode, 384, and 32 render distance. I still am 100% CPU, and I stutter a bit when loading new chunks, but I think if I tweak with the settings and use a pre-load chunk mod I can avert most issues.

PandemicOP•6mo ago

PandemicOP•6mo ago

TheNewSky•6mo ago

Did you disable distant generation?

PandemicOP•6mo ago

I did not Also.. I am an idiot... I forgot to specify the openJDK 17 java executable and my arguments were likely all not working LOL ABSOLUTELY ZERO STUTTERS NOW i am an idiot sorry

Yeshi•6mo ago

PandemicOP•6mo ago

stable 50 fps on 384 32 with aggressive