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To fix Garry’s Mod server lag, first check CPU and memory on Statistics while the lag happens. Most GMod lag comes from too many props and physics, prop spam or heavy addons. Apply the Tight limits preset on Game settings, turn on anti-spam in Falco’s Prop Protection, remove addons you don’t use and keep Lua auto-refresh off. Change one thing at a time and test.

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Quick checks

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How to fix GMod server lag

1

Measure first

Open Statistics while the server lags. Note CPU and memory use. Check the console for repeating Lua errors.
2

Lower spawn limits

On Game settings, click Presets > Tight limits (“Low spawn limits to keep a busy server fast”), review and save. Or lower single fields under Limits per player, such as Props. See Game settings explained.
3

Stop prop spam

Install Falco’s Prop Protection (DarkRP includes it) and turn on Antispam options such as “Big prop spam protection”.
4

Reduce physics work

Consider adding sv_turbophysics 1 to server.cfg so players don’t push props by walking into them. See physics and server.cfg.
5

Trim addons

Remove addons you don’t use from your Workshop collection or /garrysmod/addons. Test after each removal to find a heavy one.
6

Check start-up settings

Keep Lua auto-refresh off on a live server. A higher Tick rate is smoother but uses more CPU; lower it if CPU is maxed out.
Restart the server after each change on Game settings.

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Frequently asked questions

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What uses the most CPU on a GMod server?

Usually physics: many props, ragdolls, vehicles and contraptions touching each other. Spawn limits and prop protection keep it under control.

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Does a higher tick rate cause lag?

It uses more CPU. If Statistics shows CPU at its limit, a lower Tick rate can help. Our default is 22.

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Can I clean up props without restarting?

With an admin mod or FPP’s cleanup options. FPP can also clean up a player’s props when they disconnect.

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When should I contact support?

If CPU stays high with few players and no addons, open a ticket with the time it happened and what you tested.

Garry's Mod server guide

Every Garry’s Mod page in one place.

Physics and server.cfg

gmod_physiterations and sv_turbophysics.

Falco's Prop Protection

Anti-spam settings.

Wiremod

Wiremod limits.

Server statistics

CPU and memory use.
Tested by the FREAKHOSTING team on our Game Panel on 31 October 2026 (Garry’s Mod dedicated server, Sandbox). Steps may differ slightly if the game changes.

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Last Updated: October 2026