All The Mods 10 pushes NeoForge, hundreds of mods, and complex worldgen into one server process. If you want ATM10 optimization that players actually feel, you need more than a big RAM number. This ATM10 server config guide walks through server.properties, JVM arguments (including Aikar’s flags as a baseline), world generation discipline, chunk loading limits, sensible entity controls, optional performance mods, and backup strategy. It complements hardware sizing: if you are still shopping, Space-Node offers NVMe-backed plans sized for heavy modpack hosting in the Netherlands.
Before you change anything
Match server and client versions
ATM10 updates often. Keep server pack build aligned with the client pack your players install. Mismatched scripts and mods cause confusing connection errors that look like networking problems.
Take a snapshot baseline
Copy the world and config folders before bulk edits. Modded servers are sensitive to half-applied changes.
Measure, do not guess
Install spark (if compatible with your stack) or use your platform’s profiler. Optimization without metrics is superstition.
server.properties: sane defaults for modded
You will still find server.properties at the world root. Not every key matters equally for ATM10 server settings, but these are the usual levers:
view-distance and simulation-distance
High distances murder MSPT on modded worlds. Many admins run view-distance between 6 and 8 and simulation-distance equal or lower, depending on mod interactions and player expectations. There is no universal perfect number: lower until TPS stabilizes, then raise slightly if you have headroom.
max-players
max-players does not allocate RAM by itself, but it sets expectations. If your hardware supports six comfortable players, do not advertise thirty.
spawn-protection
Use spawn-protection to prevent accidental grief around spawn while you set up claims mods. Size it to your hub plans, not zero or absurdly huge.
allow-flight
Many tech and magic mods expect allow-flight=true. Without it, legitimate movement triggers kick loops.
sync-chunk-writes
On modern Paper-like ecosystems you may not use vanilla server.properties alone, but when present, remember disk flush behavior interacts with NVMe latency. Slow disks amplify write spikes during autosave.
Always cross-check modpack documentation: some packs ship recommended server.properties overrides in server files or wiki pages.
JVM arguments: start from Aikar’s flags
Aikar’s flags are a well-tested starting point for Minecraft Java garbage collection tuning. For modded, you still begin here, then adjust heap to your machine.
Typical pattern:
- Set -Xms and -Xmx equal to avoid heap resize churn during play.
- Use G1GC with Aikar’s suggested flags for large heaps.
- Leave OS headroom: never assign every megabyte on the VPS to
-Xmx.
Example skeleton (values must match your RAM allocation):
java -Xms10G -Xmx10G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200
-XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch
-XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M
-XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4
-XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90
-XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem
-XX:MaxTenuringThreshold=1 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true
-jar server.jar nogui
ATM10 often needs 10 GB and up for small groups, more for larger player counts. If you under-allocate heap, GC pauses and chunk gen spikes feel like “random lag.” If you over-allocate without leaving RAM for native code and OS cache, the Linux OOM killer ends the party.
World generation: control the explosion
Heavy modded worldgen is a top TPS killer during exploration.
Pregenerate during maintenance
Use a pregen tool compatible with your loader and world type, during off-peak hours, with backups enabled. Spread the workload instead of letting twenty players generate fresh chunks at once.
Limit simultaneous explorers at launch
Soft rule: staged opening, hub first, dimensions unlocked over days. It feels less cinematic than “everything day one,” but your MSPT graph will thank you.
Chunk loading and map mods
Chunk loaders and chunk tickets from tech mods keep areas alive. That is the point of automation, but unbounded loaders create permanent tick cost.
Audit loaders
Review default limits in tech mods. Teach players to use loaders only where needed, not world-spanning grids “just because.”
Alternate dimensions
Mods add dimensions with their own generation rules. Each new dimension is another place where chunk loading can spike. Set community guidelines for early exploration.
Entity limits and mob farms
Modded players build impressive farms. Vanilla mob caps are not enough context when mods spawn extra entities or block entities.
Spawner and item buildup
Items on the ground are entities. Failed hopper lines create lag bombs. Use peripheral mods or plugins that align with your pack to reduce item spam where appropriate, without breaking intended automation.
Villagers and pathfinding
Large trading halls stress pathfinding. Design halls with performance in mind: simpler paths, limited villager counts, and avoid cramming hundreds in one chunk.
Performance mods to consider (pack permitting)
Names change with versions, so treat this as a category checklist, not a promise every mod exists on your exact build:
- Recipe optimization and startup analyzers to catch script errors early.
- Lighting or chunk optimization mods compatible with NeoForge for your version.
- Client-side performance mods for players, which reduce complaints that sound like server lag.
Never bolt random “performance” jars onto a curated pack without checking official compatibility lists. ATM10 is fragile when you freestyle the mod list.
Common config tweaks for TPS
Mod-specific configs
Large mods expose tick rates, generation weights, and structure spacing in their configs. When a dimension lags, read that mod’s section first.
Forge/NeoForge server configs
Server configs sometimes duplicate vanilla levers. Keep a single source of truth: if you tune spawn limits in two places, you will forget one.
Default world type
If the pack recommends a default world preset, use it. Custom world types can multiply worldgen cost.
Network compression and bandwidth
network-compression-threshold (when present in your stack) trades CPU for bandwidth. On modded servers with fast CPUs and good networks, defaults are often fine. If you serve players on metered links, small tweaks can matter, but never sacrifice TPS to shave megabits. Test with and without changes during peak hours rather than trusting theory.
merge-radius and item cleanup
Vanilla-style item merge behavior interacts with massive modded farms. If items spray across chunks during lag spikes, MSPT worsens in a feedback loop. Some modpacks ship tuned values; others expect you to adjust spigot.yml-style sections if your server software exposes them. Read the pack wiki before copying random values from old 1.12 posts.
Security basics admins forget
Whitelist during setup
Keep whitelist on until you are ready for public joins. Modded boot sequences take time; scanners still knock on open ports.
Ops and file permissions
Limit ops.json to people who understand what /reload does in modded contexts (usually: avoid it). Restrict SSH keys and panel logins. A stolen panel session becomes world grief faster than any creeper.
Docker, Pterodactyl, and memory limits
If you run inside containers, the cgroup memory limit must exceed -Xmx by a healthy margin for native allocations. A container capped at exactly 10 GB with -Xmx10G is a frequent OOM pattern. Give 512 MB to 1 GB extra at minimum for modded, more if you run backups inside the same container.
Profiling workflow with spark (or equivalents)
A practical loop:
- Capture a profile during lag reports, not when the server is idle.
- Note whether tick entities, chunk loading, or plugins dominate.
- Change one variable (distance, pregen, mod config), reboot clean, measure again.
Chasing three changes at once makes attribution impossible.
Backup strategies that survive modded corruption
3-2-1 rule
Keep three copies, on two media types, with one off-site. For a game server, pragmatic interpretation means: live world, recent local snapshot, remote copy.
Stop-the-world vs online backups
Online backups are convenient; modded servers risk inconsistent files if mods write during copy. If your budget allows, use filesystem snapshots or brief maintenance windows for critical milestones.
Test restores quarterly
A backup you have never restored is a wish. Practice restore to a staging folder.
Exclude ephemeral folders if your tooling allows
Some runtime caches can be excluded per your host’s guidance, but never exclude anything you do not understand. When unsure, copy the whole server directory.
Hosting notes: RAM, disk, and CPU together
ATM10 server setup fails if any leg of the tripod is short:
- RAM: enough heap plus native headroom.
- Disk: NVMe for chunk IO and frequent saves.
- CPU: strong single-thread performance for the main server thread.
Space-Node focuses on game workloads with NVMe storage, which helps chunk loading keep pace with modded generation when paired with sane distances and pregen.
FAQ
What are the most important ATM10 server settings for TPS?
Usually simulation and view distances, worldgen discipline (pregen, staged exploration), and heap sizing with Aikar-style GC tuning. Then audit chunk loaders and entity farms.
Are Aikar’s flags always correct for ATM10?
They are a baseline, not a law. Start there, measure GC pauses with spark or JVM logs, then adjust heap and pause targets if needed.
Should I add extra performance mods to ATM10?
Only if pack maintainers or documented community practice supports them. Random additions break scripts and recipes.
How often should I back up an ATM10 server?
At least daily for active communities, plus manual snapshots before pack updates. High-traffic servers may want twelve-hour cycles and off-site sync.
Does NVMe really matter for ATM10?
Yes. Modded worlds are random IO heavy. Slow disks turn autosave and chunk loads into MSPT spikes.
Last updated: 2026-03-30