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Thread Hitch Warnings

Last reviewed: June 2, 2026

What Is a Thread Hitch in FiveM?​

A thread hitch occurs when a specific part of the FiveM server (called a “thread”) takes too long to process its tasks. These threads are responsible for different aspects of the server — like game logic, entity syncing, networking, etc.

What Does a Thread Hitch Mean?​

FiveM’s server runs on a tick-based system, where every thread is expected to complete its work within a small window of time (typically ~16ms for smooth performance, matching 60 FPS logic). If a thread exceeds this expected time, a hitch warning appears in the console.

What a Hitch Means (In Practical Terms)​

"This part of the server is taking too long to finish its job, and it's slowing everything else down."

It’s similar to a lag spike in a game — but instead of a player’s FPS dropping, the server’s brain stalls, affecting everyone connected.

Common Symptoms of a Thread Hitch:​

  • It creates lag or delayed server response.
  • May cause rubberbanding for players.
  • Leads to poor synchronization of vehicles, peds, or events.
  • If frequent or severe, can even crash the server.

Hitch Types You'll See in Logs​

  • sync thread hitch – delay in syncing game entities (vehicles, peds, players)
  • network thread hitch – delay in sending/receiving network data
  • server thread hitch – delay in core server logic (scripts, events, DB, etc.)
  • Generic: Hitch warning: frame time of Xms – overall stall affecting multiple threads

Lets dive into more detail in the table below:

3 Kinds of Thread Hitch Warnings​

Server​

What is a Sync Thread Hitch?

This is the core logic loop of the FiveM server.
Console msg:

"Thread hitch warning: server main thread took Xms"

Common Causes:

  • Badly optimized server-side scripts.
  • Heavy MySQL sync calls inside player events.
  • Resource loading issues

Fix Tips:

  • Switch to MySQL.Async.
  • Audit server.cfg for bloated or broken scripts.
  • Profile performance (sv_profile 1, resmon).

Network​

What is a Network Thread Hitch?

This thread deals with sending/receiving data packets between the server and clients.

Console msg:

"Thread hitch warning: network thread took Xms"

Common Causes:

  • Laggy or unstable network connections (usually client-side).
  • Server under DDoS or packet flood.
  • Too much real-time data being sent (e.g. custom voice/data streaming).
  • Server NIC misconfiguration (rare).

Fix Tips:

  • Reduce real-time network-intensive scripts.
  • Check server host firewall or router.
  • Monitor for abuse (anticheat tools like txAdmin’s player monitoring help).

Sync​

What is a Sync Thread Hitch?

If your FiveM console log shows many "sync thread hitch warnings", that means parts of the server (especially the main game thread or resource threads) are lagging or stalling — usually due to heavy or poorly optimized server-side scripts.

FiveM's sync thread is an internal logic thread that:

  • Handles game entity synchronization: peds, vehicles, player states, objects.
  • Hitches here usually mean that scripts or in-game conditions are choking the logic loop.
  • Syncs player/entity data
  • Runs server-side game logic
  • Manages resources/scripts

If this thread takes too long to complete a "tick," you get a hitch warning — which means your scripts, resources, or in-game activity are stalling the server loop, not that the server hardware is failing.

Console msg:

"Thread hitch warning: sync thread took Xms"

Common Causes:

  • Too many entities (especially unoptimized AI, props, or cars).
  • Server-side scripts doing heavy processing.
  • Overuse of server events with lots of players.
  • Loops that don’t yield enough (Wait(0) abuse).

Fix Tips:

  • Clean up unused entities.
  • Optimize loops with longer waits.
  • Move expensive logic to client where safe.
  • Use resmon and sv_profile to find culprits.

Common Causes & Fixes​

Heavy or Unoptimized Scripts​

Bad loops, too many server events, or frequent database queries.

Use profiling to find heavy scripts:

  • Run resmon 1 in console to show resource CPU usage.
  • Use sv_profile 1 and check logs for usage spikes.
  • Avoid tight loops or unnecessary server triggers.
  • Offload frequent operations to client-side if possible.
Scripts using Citizen.Wait(0) too often in server.lua.

Optimize scripts:

  • Replace Citizen.Wait(0) with longer waits (100–1000ms) unless it needs real-time speed.
  • Avoid tight loops or unnecessary server triggers.
  • Offload frequent operations to client-side if possible

Too Many Entities to Sync​

Massive number of peds, vehicles, or objects being streamed/synced at once.

Common in servers with custom mapping, AI traffic, or jobs that spawn lots of props/NPCs.

  • Limit unnecessary vehicle/ped spawning.
  • Use SetEntityNoCollisionEntity, SetEntityAsNoLongerNeeded, or SetEntityInvisible for unneeded entities.
  • Remove unused props/objects using DeleteEntity when no longer needed.

Database Bottlenecks (MySQL Async)​

Scripts using MySQL queries inside real-time loops or server events.

Server waits on slow DB response = sync hitch.

  • Use MySQL-Async properly:
    • Avoid queries in tick events or loops.
    • Use MySQL.Async.fetchAll(...) and cache data if needed.
  • Optimize your SQL database (indexes, cleanup).

Long Tick Handlers​

Server-side Citizen.CreateThread blocks main thread for too long.

Review any server-side threads and space out workloads:

Instead of:

while true do
    -- heavy logic
    Citizen.Wait(0)
end

Do:

while true do
    -- lighter logic
    Citizen.Wait(500)
end

Resource Loading Delays​

Slow or bloated resources taking long to load during join or restart.
  • Compress textures and map files.
  • Move static data client-side when possible.
  • Use ensure order in server.cfg to load key resources first.

Too Many Unused Resources Running​

You're running 50+ scripts, many of which might be unused but still consume CPU
  • Disable or remove unused or test scripts.
  • Group utility scripts together (e.g., use one "utils" or "core" script instead of many separate).

  • Use resmon 1 or sv_profile 1 while players are active to see heavy resources.

  • Restart the server and gradually re-add resources to see which causes the hitch.

  • Enable onesync correctly in your server.cfg:

    onesync on

    (Or use onesync legacy or onesync infinite depending on your setup.)