# Why Is My FS25 Server Slow Despite Few Players?

> FS25 server lagging even with few players? The 5 real causes: AI vehicles, weak CPU, autosave, faulty mods. With checklist.

**Short answer:** Player count is often not the cause. Most common reasons: too many AI vehicles (AutoDrive, Courseplay), faulty mods, a weak server CPU or an oversized savegame.

| | |
| --- | --- |
| Game | LS25 |
| Category | Troubleshooting |
| Difficulty | Beginner |
| Reading time | 7 min |
| Last updated | 2026-05-17 |
| Language | en |
| Source | https://agrarchaoten.com/en/guides/ls25-server-langsam |
| Other language | https://agrarchaoten.com/guides/ls25-server-langsam |

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## Contents

- [Players are usually not the problem](https://agrarchaoten.com/en/guides/ls25-server-langsam#spieler-sind-nicht-das-problem)
- [Cause 1: AI vehicles](https://agrarchaoten.com/en/guides/ls25-server-langsam#ursache-1-ki-fahrzeuge)
- [Cause 2: Weak CPU](https://agrarchaoten.com/en/guides/ls25-server-langsam#ursache-2-schlechte-cpu)
- [Cause 3: Autosave](https://agrarchaoten.com/en/guides/ls25-server-langsam#ursache-3-autosave)
- [Cause 4: Faulty mods](https://agrarchaoten.com/en/guides/ls25-server-langsam#ursache-4-fehlerhafte-mods)
- [Cause 5: Too many objects](https://agrarchaoten.com/en/guides/ls25-server-langsam#ursache-5-zu-viele-baeume)
- [Quick checklist](https://agrarchaoten.com/en/guides/ls25-server-langsam#schnell-checkliste)

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## Players are often not the problem

Many FS25 players assume: fewer players = faster server. That's only partly true. FS25 servers can lag heavily even with just 1–2 players — when the real cause lies elsewhere.

**Important note:** FS25 is largely single-threaded. That means the entire game logic runs on a single CPU core. Whether 2 or 16 players — the CPU load per tick stays similar, because mods, AI and physics do the same work.

## Cause 1: Too many active AI vehicles

This is by far the most common cause of lag with few players. Every AI-controlled vehicle (AutoDrive, Courseplay, workers) constantly calculates routes, collisions and actions on the server core.

- 10 AI vehicles running at once can completely max out a weak CPU
- **Fix:** Reduce AI vehicles, don't run them all at the same time

## Cause 2: Weak server CPU

If your server runs on older hardware with weak single-core performance, that's often the root of the problem. Classic server processors are often built for multi-core enterprise workloads — not for single-core gaming.

## Cause 3: Autosave and saving too often

Every time the server saves, there's a brief spike in load. That's normal and usually only lasts 1–2 seconds. It becomes a problem when:

- The savegame is very large (lots of vehicles, lots of objects in the inventory)
- Several players save manually at the same time ("Saving while already saving")
- The autosave interval is set too short

**Fix:** Increase the autosave interval to 15–20 minutes, sell unneeded vehicles to shrink the savegame.

## Cause 4: Faulty or incompatible mods

Some mods have script errors that cause constant CPU overhead. You can spot this in the server log by recurring ERROR entries.

**1. Open the server log**

In the web interface under "Logs" or directly in the server's log.txt file.

**2. Search for "Error"**

Recurring LUA errors point to a problematic mod. The mod name is usually part of the error text.

**3. Disable the problematic mod**

Disable one mod after another until the error disappears.

## Cause 5: Map with too many trees or objects

Some map mods exceed the FS25 tree limit (30,000). We've seen this in an actual server log: "NumTrees: 32.554 / MaxNumTrees: 30.000" — that's 2,554 trees over the maximum. That alone can cost performance.

## Quick checklist: what to check?

- ☐ How many AI vehicles are running at the same time right now?
- ☐ Check the server log for ERROR entries
- ☐ Check the savegame size (sell vehicles)
- ☐ Check the autosave interval (15–20 min is ideal)
- ☐ Which CPU does your server provider use?
- ☐ Install SimpleInspector and watch the TPS live

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## Frequently asked questions

**Q: Why is my FS25 server slow even though only 2 players are online?**
A: Player count is often not the cause. Most common reasons: too many AI vehicles (AutoDrive, Courseplay), faulty mods, a weak server CPU or an oversized savegame.

**Q: Can the server CPU be responsible for FS25 lag?**
A: Yes — and it's an often overlooked reason. FS25 runs single-threaded. What matters is the single-core performance of the server CPU, not the number of cores.

**Q: How do I measure my FS25 server's TPS?**
A: Install the SimpleInspector mod (shows the TPS live in-game) or install AutoDrive (automatically writes the TPS to the log.txt file).

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## About this guide

This guide was written by the Agrar Chaoten community.

*Source: https://agrarchaoten.com/en/guides/ls25-server-langsam*
*Agrar Chaoten — https://agrarchaoten.com*