ServerCore in FTB StoneBlock 4

Same as in the FTB Skies 2 1.22.0 guide

ServerCore is a server optimization mod. Its job is to cut lag spikes and reduce server load, and it works on both dedicated servers and singleplayer, so it is useful whether you host a world for friends or play solo.^[1]

The pack includes ServerCore 1.5.19+1.21.1 for NeoForge.^[2]

Out of the box, ServerCore should not alter vanilla behavior. Features that do change gameplay are disabled by default, and the mod's page recommends configuring it to find the balance between speed and behavior that suits you.^[1]

What it can do

• Patches and optimizations that reduce lag spikes, including work on chunk ticking, mob spawning, item frames and player logins.^[1]
• Entity Activation Range, which cuts down how many entities the server has to process. It is a port based on the Spigot and PaperMC implementations, with more options.^[1]
• Dynamic performance checks, which adjust chunk-tick distance, view distance, simulation distance and mobcaps based on tick time and config.^[1]
• Villager lobotomization, which makes villagers stuck in 1x1 spaces tick less often. This helps with big trading halls.^[1]
• Per-spawngroup control over spawn rates and vanilla mobcaps, plus breeding caps that limit how many mobs of one type can be bred within a radius.^[1]
• A chunk ticking distance setting, which reduces how far away chunks can tick (mob spawns and random ticks).^[1]

Handy commands and config

Use /servercore status to see the current dynamic settings, /servercore settings to change them in game, and /servercore reload to reload the configuration file. /mobcaps shows the current per-player mobcaps for each spawn group, and /statistics entities or /statistics block-entities shows performance statistics.^[1]

The mod's settings are in config.yml and optimizations.yml, in the config/servercore folder.^[1]

Same as in the FTB Skies 2 1.22.0 guide

Good news: ServerCore is a performance mod, so there's no gear to craft or progression to chase. It aims to optimize the Minecraft server, and it works on dedicated servers and in singleplayer.^[1]

Unverified No in-pack recipes, quests or crafting items for this mod could be confirmed from the available sources, so there is no 'first item to make' here. This guide doesn't include recipe blocks for that reason.

What it does out of the box

By default, ServerCore shouldn't alter vanilla behavior. Features that do change gameplay are disabled by default. Its optimizations are meant to cut random lagspikes, and they cover chunk ticking, mob spawning, item frames and player logins.^[1]

Your first steps

1. Run /servercore status to see information about the current dynamic settings.^[1]
2. Run /mobcaps to see the current per-player mobcaps for each spawn group.^[1]
3. Run /statistics entities or /statistics block-entities to see performance-related statistics. This helps you spot what is eating your tick time.^[1]
4. If you edit the configuration file, run /servercore reload to reload it without restarting.^[1]
5. Use /servercore settings if you want to modify the dynamic settings in-game.^[1]

Features worth knowing about

Once you're comfortable, these are the main features you can tune. Entity Activation Range cuts down on how many entities the server has to process. Dynamic performance checks can automatically adjust chunk-tick distance, view distance, simulation distance and mobcaps based on tick time. Villager lobotomization makes villagers stuck in 1x1 spaces tick less often, which helps with large trading halls. Breeding caps limit how many mobs of the same type can be bred within a certain radius.^[1]

Same as in the FTB Skies 2 1.22.0 guide

This one is a bit different from the machine-heavy mods you usually see on the channel. ServerCore is a performance mod that aims to optimize the Minecraft server. The sources describe no machines, multiblocks, power, fluids or item automation for it. What it has instead are systems that change how the game ticks things behind the scenes. It works on both dedicated servers and singleplayer.^[1]

Default behavior

By default, the mod's project page says ServerCore should not alter vanilla behavior, and features that do are disabled by default. Its patches and optimizations aim to improve performance and reduce lagspikes, and they shouldn't make any noticeable changes during gameplay.^[1]

The project page advises configuring the mod to your own requirements, for the best balance between speed and behavior. It says you can change the settings by editing config.yml and optimizations.yml in the config/servercore folder.^[1]

The systems behind it

• Optimizations: the project page says many of them focus on getting rid of the majority of random lagspikes on servers. Others cover chunk ticking, mob spawning, item frames and player logins.^[1]
• Entity activation range: described as a very configurable feature that can drastically cut down the number of entities the server has to process. It is a port based on the Spigot and PaperMC implementations, with more configuration options and some optional extras.^[1]
• Dynamic performance checks: these allow the server to automatically adjust chunk-tick distance, view distance, simulation distance and mobcaps, depending on tick time and the config.^[1]
• Villager lobotomization: this can cut down villager lag from large trading halls by making villagers stuck inside 1x1 spaces tick less often.^[1]
• Configurable mob spawning: it allows you to modify the spawn rate and the vanilla mobcaps of each individual spawn group. It also provides optional functionality to force mobcaps onto zombie reinforcements, spawners and nether portal random ticks.^[1]
• Breeding caps: a feature that allows you to set a cap on how many mobs of the same type can be bred within a certain radius. The page says this can help prevent players from breeding thousands of animals like chickens or cows in a small area.^[1]
• Chunk ticking distance: a setting that allows you to reduce the distance at which chunks can tick (mob spawns and random ticks).^[1]

Commands for checking on it

• The mod's page lists /servercore reload as the command that reloads the configuration file.^[1]
• The page lists /servercore settings as the command that allows modifying dynamic settings in game.^[1]
• The page lists /servercore status as the command that gives information about the dynamic settings, as the mod describes them.^[1]
• The page lists /mobcaps as the command that displays per-player mobcaps for each spawn group.^[1]
• The page lists /statistics entities and /statistics block-entities as commands that display performance-related statistics.^[1]

The mod's page also lists placeholders that other tools can use to display values. These cover view distance, simulation distance, chunk tick distance and the global mobcap percentage in use, as well as counts of chunks, entities and ticking block entities.^[1]

Unverified The sources don't say which ServerCore features are enabled in the pack, or what the pack's config values are. Check the in-game /servercore status command to see what is active on your world.

FTB StoneBlock 4 1.21.0 ships ServerCore 1.5.19+1.21.1, and the mod has been in the pack since FTB StoneBlock 4 1.0.0 or earlier. Here are the notable changes from the mod's own changelogs.^[3]

Unverified The sources here show no pack changelog entries for ServerCore, so this history comes only from the mod's own changelogs. Any pack-level changes to the mod would be in the pack's release notes, which are not shown here.

1.5.19+1.21.1 (the version in this pack)

• Fixed mobcaps not updating on /sc reload.^[4]

1.5.17+1.21.1

• Fixed an incompatibility with sable (ray casting in sublevels).^[5]
• Fixed default dynamic setting values not always initializing properly.^[5]

1.5.10+1.21.1

• Fixed a mod incompatibility with the latest version of Moonrise.^[6]
• Fixed Cobblemon mobs despawning much slower when activation range is enabled.^[6]

The releases listed above only contain fixes. Changelogs for the releases in between were not provided, so this is not a full history.^[4][5][6]