ValheimCommunityPatch

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. Server memory fixes are the

exception: they are off by default and opt-in, see Server memory. The

dedicated-server garbage collector settings moved to a separate plugin, see

Server garbage collector. 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 Installation.

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 dedicated server never has a player to anchor that area to, so the game parks it

far outside the world 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

Terrain Fix comparison

| Terrain Tears | Terrain Fixed |

|---|---|

| | |

| Shore Shade Tears | Shore Shade Fixed |

|---|---|

| | |

Shore tears are much more subtle as it is a shading issue. On the right side of the first image directly above the head you can see the shading issue.

Fixes in this release

Where a fix was sourced from, or corroborated against, another modder's work, that is recorded per

fix under Credit and sources.

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 hol