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JAVA 21 ZGC • 20.0 TPS TARGET • 2026-11-12

FragNode Minecraft Modpack & PaperMC JVM Sizing Blueprint

FragNode models Minecraft 1.21 PaperMC, Fabric, and 250-mod NeoForge packs by separating JVM heap (-Xms/-Xmx) from Linux kernel pagecache, Metaspace, and Netty off-heap network buffers so guilds hold a steady 50 ms tick budget (20.0 TPS).

FragNode rule: reserve 25% host RAM outside -Xmx for Linux off-heap safety.

Load 32-slot preset in FragNode Workbench -> Official Wiki: PaperMC & Aikars/ZGC JVM Documentation

FragNode 4-Zone Baseline Output (32 Slots / 180 Mods)

25565/tcp+udp (Minecraft), 24454/udp (Simple Voice Chat)
Recommended Host RAM 24 GB DDR5 1.5 GB OS + 3.2 GB Base + 5.8 GB Mod + 7.6 GB Slots
CPU & NVMe Target 4 vCPU AMD EPYC KVM (3.6 GHz+ • 120+ GB NVMe) 60 Gbps Stateful UDP Scrubbing
Required Firewall Ports MC-JVM21 25565/tcp+udp (Minecraft), 24454/udp (Simple Voice Chat)

In our 4-zone heap formula on FragNode, an 8-to-25 player Cobblemon or ATM9 squad maps cleanly to a 16 GB NVMe KVM tier such as Hostinger Game Panel 4 ($11.99/mo published 2026-11-12 rate with pre-installed CubeCoders AMP), where we assign 12 GB to Java 21 Generational ZGC and keep 4 GB reserved for Linux and chunk I/O. For 50+ concurrent players running Velocity proxies and parallel dimension loading, FragNode recommends stepping up to a 32 GB Dedicated VDS ($37.50/mo on UltaHost) to eliminate shared vCPU steal.

Inspect Hostinger Game Panel Specs via FragNode -> Compare UltaHost Dedicated VDS via FragNode ->

FragNode Concurrency-to-RAM Sizing Matrix (2026-11-12 Public Rates)

Player Concurrency Host RAM Tier Heap Flag / CPU Target Published Vendor Tier Vendor Page
4–10 Players (PaperMC / Vanilla) 8 GB Host -Xms5G -Xmx6G (G1GC) Hostinger Game Panel 2 (8 GB • $6.99/mo) Check Hostinger Game Panel via FragNode
12–25 Players (Cobblemon / Create) 16 GB Host -Xms12G -Xmx12G (ZGC) Hostinger Game Panel 4 (16 GB • $11.99/mo) Check Hostinger Game Panel via FragNode
25–50 Players (ATM9 / 250+ Mods) 32 GB VDS -Xms22G -Xmx24G (ZGC) UltaHost VDS 32 GB ($37.50/mo) Check UltaHost Dedicated VDS via FragNode
60–120+ Network (Velocity + SMP) 64 GB VDS Multi-JVM Split Heap UltaHost VDS 64 GB ($68.00/mo) Check UltaHost Dedicated VDS via FragNode

FragNode pricing citation: Public rates retrieved 2026-11-12 from official vendor pricing pages; verify live renewal terms at checkout.

FragNode Java 21 Generational ZGC & UFW Port Configuration

java -Xms12G -Xmx12G -XX:+UseZGC -XX:+ZGenerational \
  -XX:+AlwaysPreTouch -XX:+DisableExplicitGC \
  -XX:+PerfDisableSharedMem -jar neoforge-server.jar --nogui
sudo ufw allow 25565/tcp && sudo ufw allow 25565/udp && sudo ufw allow 24454/udp

FragNode Production Configuration & Firewall Checklist

  1. FragNode Engineering Check #1

    Never assign 100% of VPS memory to -Xmx: on a 16 GB node, capping heap at 12 GB leaves 4 GB for JVM Metaspace, native Netty buffers, and Linux NVMe pagecache.

  2. FragNode Engineering Check #2

    Pre-generate a 5,000-block radius with the Chunky plugin before opening whitelist slots so Elytra exploration does not stall the primary 3.6 GHz+ simulation thread.

  3. FragNode Engineering Check #3

    Keep -Xms equal to -Xmx with -XX:+AlwaysPreTouch so Linux commits memory pages at boot rather than stalling mid-boss-fight.

FragNode Minecraft Modpack & PaperMC JVM Sizing Blueprint — FragNode 4-zone sizing illustration

Customize Exact Mod Counts in the FragNode Workbench

We pre-linked this blueprint to our interactive FragNode 4-zone workbench so you can drag player concurrency up to 200 slots or adjust active mods between 0 and 300 in real time.

FragNode Engineering FAQ: FragNode Minecraft Modpack & PaperMC JVM Sizing Blueprint

How does FragNode size RAM for All The Mods 9 (ATM9) with 15 players?

FragNode calculates 1.5 GB OS reserve + 3.2 GB base engine + ~6.5 GB modpack heap + ~3.2 GB player concurrency buffer, snapping cleanly to a 16 GB KVM tier running -Xms12G -Xmx12G.

Why does FragNode recommend Java 21 Generational ZGC above 12 GB heap?

On heaps of 12 GB to 24 GB+, Generational ZGC (-XX:+UseZGC -XX:+ZGenerational) avoids multi-hundred-millisecond old-generation stop-the-world pauses common in untuned heaps.

Which APAC regions does FragNode list for Southeast Asian Minecraft guilds?

FragNode highlights Singapore and Tokyo nodes on Vultr High Frequency and UltaHost VDS alongside Hostinger Asia locations; run mtr to each vendor Looking Glass IP to verify your local ISP route.

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