Fabric 1.21.11, 3 players, ~12-15 TPS – looking for help reading this Spark report

  • Thread starter Thread starter /u/Curious_Associate_56
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/u/Curious_Associate_56

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Hey folks,

we have a small private Fabric 1.21.11 server with 3 players max. When all of us are online, TPS consistently sits at 12-15. MSPT median is ~57-70ms with spikes up to 850ms. This shows up as broken blocks visually reappearing for ~0.5s after mining, and food sometimes needing to be eaten twice or more before it actually registers.

We've pre-generated chunks using Chunky: 10k blocks radius in the overworld, 1250 in the nether, and 7500 in the end.

We're trying to keep the experience as close to vanilla as possible.

Spark report: https://spark.lucko.me/cUsyS0bk87

What we've tried so far:

  • Switched from G1GC to ZGC (`-XX:+ZGenerational`, Java 21), symmetric 10G heap
  • Reduced simulation-distance from 10 to 6
  • Set `sync-chunk-writes=false`
  • Disabled VanillaTweaks datapacks, with no change

Any help appreciated!

Installed Mods/Datapacks:

Mods:

actuallyharvest, alternate-current, appleskin, armored-elytra, betterthanmending, c2me, carpet, carryon, chunky, cloth-config, clumps, collective, cropsloverain, customtimecycle, easyanvils, easymagic, easyshulkerboxes, fabric-api, fabric-language-kotlin, fastback, fastitemframes, ferritecore, forgeconfigapiport, horseman, incendium, jade, jei, justmobheads, justplayerheads, krypton, lithium, lithostitched, modernfix, noisium, nullscape, puzzleslib, scalablelux, servercore, silk-all, spark, supermartijn642corelib, tectonic, terralith, trade-cycling, trashcans, treeharvester, universalbonemeal, veinminer, veinminer-enchantment, visualworkbench, vmp, voicechat, vanilla-refresh

Datapacks (mod-bundled):

carryon, collective, easyanvils, easymagic, easyshulkerboxes, fastback, fastitemframes, horseman, incendium, lithostitched, nullscape, supermartijn642corelib, tectonic, terralith, trashcans, universalbonemeal, veinminer-enchantment, visualworkbench, vanilla-refresh

Datapacks (world):

VanillaTweaks 26.1, afk display, anti enderman grief, bat membranes, silence mobs, unlock all recipes, wandering trades

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