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Game Server Lag Issues: Causes and Solutions

Causes and solutions for game server lag issues: network latency, server-side lag, TPS drops, MTR testing and FiveM/Minecraft/CS2 optimization guide.

Read time: 12 min Game Server Setup
lag issuegame serverpingtpsfivemminecraftcs2optimization
Author
REXE Teknoloji Network & Security Team
Editor
REXE Teknoloji Technical Editorial
First published
Last updated

Game Server Lag Issues: Causes and Solutions

Lag on a game server is one of the most common complaints from players. However, "lag" is not a single problem — it has different types and causes. This guide helps you correctly diagnose lag issues and implement effective solutions.

Types of Lag

1. Network Latency (Network Lag / Ping)

This is the communication delay between the player's computer and the server. Measured by ping value.

Ping Assessment:
< 20 ms:    Excellent (player won't notice)
20-50 ms:   Good (acceptable)
50-100 ms:  Medium (slight delay may be felt)
100-150 ms: Poor (noticeable delay)
> 150 ms:   Very Poor (unplayable)

2. Server-Side Lag (TPS)

This is when the server's processing capacity is insufficient. Measured by TPS (Ticks Per Second).

TPS Assessment (Minecraft example):
20 TPS:    Excellent (normal)
18-20 TPS: Good
15-18 TPS: Medium (slight lag)
10-15 TPS: Poor (noticeable lag)
< 10 TPS:  Very Poor (unplayable)

3. Packet Loss

When some of the sent packets don't reach their destination. Even 1% can cause serious problems.

Packet Loss Assessment:
0%:      Excellent
0-1%:    Acceptable
1-5%:    Problematic
> 5%:    Critical (immediate action required)

Diagnostic Tools

MTR (My Traceroute) Network Analysis

MTR is a powerful network diagnostic tool that combines traceroute and ping.

hljs bash
# Linux/Mac
mtr --report --report-cycles 100 SERVER_IP

# Example MTR output:
# Host                Loss%   Snt   Last   Avg  Best  Wrst StDev
# 1. 192.168.1.1      0.0%   100    1.2   1.1   0.9   2.1   0.2
# 2. 10.0.0.1         0.0%   100    5.3   5.1   4.8   6.2   0.3
# 3. SERVER_IP        0.0%   100   12.3  12.1  11.8  13.2   0.5

Server Resource Usage

hljs bash
# CPU usage
top
htop

# RAM usage
free -h

# Disk I/O
iostat -x 1

# Network traffic
netstat -s

Network Lag Causes and Solutions

Cause 1: High Ping (Remote Server Location)

Symptoms:
- All players experiencing high ping
- Ping is stable but high
- High latency at last hop in MTR

Solution:
- Move server to a location closer to your player base
- Choose Istanbul location for Turkish players
- Get 5-15 ms ping with REXE's Istanbul VDS

Cause 2: Packet Loss

hljs bash
# Detect packet loss
mtr --report SERVER_IP

# Which hop has packet loss?
# If loss at last hop: server issue
# If loss at intermediate hop: ISP/routing issue

Cause 3: DDoS Attack

hljs bash
# Detect abnormal traffic
netstat -an | grep ESTABLISHED | wc -l
tcpdump -i eth0 -n | head -50

# Symptoms:
# - Sudden ping spike
# - All players disconnecting simultaneously
# - Server CPU/RAM normal but inaccessible

# Solution:
# - Immediately notify REXE support team
# - Activate Path.net DDoS protection

Server-Side Lag Causes and Solutions

Cause 1: CPU Overload

hljs bash
# Check CPU usage
top -bn1 | grep "Cpu(s)"

# Which process is consuming CPU?
top -bn1 | head -20

FiveM CPU Optimization:

hljs lua
-- server.cfg
set sv_maxClients 32  -- Limit player count
set onesync_enabled true  -- Better performance with OneSync

Minecraft CPU Optimization:

hljs yaml
# spigot.yml
world-settings:
  default:
    mob-spawn-range: 4
    entity-activation-range:
      animals: 16
      monsters: 24
      misc: 8
    tick-inactive-villagers: false
    nerf-spawner-mobs: true

Cause 2: Insufficient RAM

hljs bash
# Check RAM usage
free -h

# If swap usage is high, RAM is insufficient

Minecraft JVM Optimization:

hljs bash
java -Xms4G -Xmx4G \
  -XX:+UseG1GC \
  -XX:+ParallelRefProcEnabled \
  -XX:MaxGCPauseMillis=200 \
  -XX:+UnlockExperimentalVMOptions \
  -XX:+DisableExplicitGC \
  -XX:G1NewSizePercent=30 \
  -XX:G1MaxNewSizePercent=40 \
  -jar server.jar nogui

Cause 3: Disk I/O Issues

hljs bash
# Check disk I/O
iostat -x 1 5

# If %util is high, there's a disk bottleneck
# If await is high, disk is slow

# Solution:
# - Use NVMe SSD (instead of HDD or SATA SSD)

Cause 4: Plugin/Mod Issues

hljs bash
# Minecraft: Timings report
/timings on
# Wait 5 minutes
/timings paste
# Open URL in browser and identify heavy plugins

# FiveM: Resource profiler
resmon start
# Identify heavy resources

Game-Specific Optimization

FiveM Optimization

hljs lua
-- server.cfg
set sv_maxClients 64
set onesync_enabled true
set onesync_population true
set net_maxPacketSize 1300

Minecraft Optimization

hljs yaml
# paper.yml
world-settings:
  default:
    optimize-explosions: true
    mob-spawner-tick-rate: 2
    max-entity-collisions: 2
    despawn-ranges:
      soft: 28
      hard: 96

CS2 Optimization

# server.cfg
sv_maxrate 786432
sv_maxupdaterate 128
sv_mincmdrate 64
sv_maxcmdrate 128

When to Upgrade Your Server

Upgrade Indicators:

CPU:
- Consistently 80%+ usage
- TPS consistently below 18
- Cannot increase player count

RAM:
- Swap usage present
- OOM (Out of Memory) errors
- Memory leak suspected

Disk:
- %util consistently 80%+
- await > 20ms
- Slow chunk loading

Network:
- Bandwidth limit exceeded
- Packet loss present
- DDoS attacks effective

Diagnose before solving lag issues. Detect network issues with MTR, CPU/RAM issues with top/htop, disk issues with iostat. Optimizations made without knowing the source of the problem are generally ineffective.

REXE's NVMe SSD-based VDS servers and Path.net network infrastructure eliminate the vast majority of game server lag issues. Istanbul location provides 5-15 ms ping values for players in Turkey.

Frequently Asked Questions

TPS is dropping on my FiveM server, what should I do?

First identify which resource is consuming CPU (resmon command). Disable or optimize heavy resources. Enable OneSync. Keep player count proportional to server capacity. If the problem persists, upgrade to a VDS with a more powerful CPU.

My Minecraft server has lag but CPU and RAM look normal, why?

This is usually a disk I/O issue. Check disk usage with the iostat -x 1 command. If you're using HDD or SATA SSD, switching to NVMe SSD makes a big difference. Also check the timings report of plugins — some plugins can cause invisible CPU spikes.

My players are experiencing high ping but server resources are normal, what's the problem?

This is a network issue. Run an MTR test and identify which hop has the delay. If the server is outside Turkey, moving to Istanbul location can reduce ping to 5-15 ms for Turkish players. If there's packet loss, notify the REXE support team.

Is 128 tick rate working on my CS2 server?

For 128 tick rate on CS2 server, set sv_maxupdaterate 128 and sv_mincmdrate 128. However, 128 tick rate uses approximately 2x more CPU and bandwidth than 64 tick. Make sure your server can handle this load. REXE's VDS servers provide sufficient performance for 128 tick CS2 servers.

How do I know if it's a lag issue or a DDoS attack?

Signs of a DDoS attack: sudden and severe ping spike, all players disconnecting simultaneously, server resources (CPU/RAM) appearing normal but inaccessible, abnormal traffic in tcpdump. Normal lag usually increases gradually and is related to CPU/RAM usage. When in doubt, notify the REXE support team.

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