Valheim Community Patch

Valheim Community Patch

Vanilla bug fixes and performance fixes. No gameplay changes.

This mod exists to fix things that are broken or pathologically slow in Valheim itself — crashes, exceptions that silently kill a system, item loss, quadratic hot paths, per-frame allocations, log spam. It deliberately ships no quality-of-life features, no balance changes, and no content, so you can install it on a server without anyone having to agree about how the game should play.

Performance fixes are always on; the config holds only their tuning values and the admin-only Verify diagnostics. Correctness and terrain fixes each have their own toggle. Config values are admin-only and server-synced.

Each fix is tagged with the side it is worth installing on. (server) fixes only do something on the machine hosting the world — a dedicated server or a listen host. (client) fixes need a local player, and are not even applied on a dedicated server, which is why the startup log there reports a smaller number. (both) fixes do work wherever they are installed. A one-sided install is safe; it just gets you a subset. See the Installation section below.

Why so many fixes are client-side

A Valheim dedicated server is not a simulation host. It only creates game objects inside its own active area, and a headless server never has a player to anchor that area to, so that area stays at world origin for the whole run. Creatures, fires, chests, tar pits and everything else near a player are created, owned and simulated on that player's client; the server holds the data and relays it.

So the fixes a server gains from are the data-and-network ones — ZDO handling, world load, packet allocation, socket logging — and almost everything else is worth having on the client.

Performance Side by Side

UrSF0NYgFpo

Terrain Fix comparison

Terrain tears (vanilla)

Terrain fixed

Fixes in this release

Where a fix was sourced from, or corroborated against, another modder's work, that is recorded per fix in the Credit and sources section below.

Performance

[]Fix Portal Connection Scan (server) — pairs portals through a tag index instead of rescanning every portal for each unconnected one every five seconds.[/]

[]Fix World Load Connection Scan (server) — indexes the world-load pairing of portals, spawners and sync transforms with their targets instead of comparing every pair.[/]

[]Fix Disconnect ZDO Sweep (server) — indexes non-persistent objects by owner, so a disconnect sweeps only the departing player's objects instead of every ZDO in the world.[/]

[]Fix Tar Pit Buffer Disposal (client) — disposes tar pit raycast buffers only when they were allocated, so a tar pit whose load failed cannot throw out of scene teardown.[/]

[]Fix ZDO Packet Allocation (both) — writes one network package into another straight from its buffer instead of copying the whole payload onto the heap first.[/]

[]Fix Mist Query Overhead (client) — answers mist volume queries from a zone-bucketed snapshot and heightmap data instead of scanning every mist volume with native reads and physics rays per particle.[/]

[]Fix Heightmap Lookup Scan (both) — finds the terrain tile under a point with a zone-keyed lookup instead of scanning every loaded tile.[/]

[]Fix Static Object Ground Checks (both) — reads a tree or rock's position once per ground check instead of about six times.[/]

[]Fix Grass Rebuild Burst (client) — spreads a whole-area grass rebuild over a few frames, nearest patches first, instead of regenerating every patch in one frame.[/]

[]Fix Terrain Builder Throughput (both) — makes the terrain build thread sleep only when idle and hold more finished results.[/]

[]Fix Zone Collider Stall (client) — bakes the terrain collider of an already-generated zone on a background thread instead of the main thread.[/]

[]Fix Prefab Query Scan (both) — answers "every object of this prefab" from an index instead of scanning every ZDO in the world.[/]

[*]Fix Grass Ground Ra