Quick answer: GMod lag: remove heavy addons, limit props/NPCs, increase RAM (8 GB+) and use smaller map.
If you landed here: FPS drops, rubberbanding, delayed toolgun actions or server freeze with many entities.
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Frequently asked questions (FAQ)
GMod server lagging – most common cause?
Heavy workshop addons (Wiremod, PAC3, large maps), too many props, low RAM (8 GB+ recommended), bad Lua addons.
Which addon causes lag?
Remove addons one by one. gmod_tool duplicator with thousands of props is a common cause. Use cleanup addons or change map.
How much RAM for GMod server?
Small (10 players): 4–6 GB. Many addons: 8–12 GB. DarkRP/Starfall-heavy: 12–16 GB.