Quick answer: Arma 3 lag: reduce AI/units, remove heavy mods, increase RAM (12 GB+ modded) and check server FPS in admin panel.
If you landed here: Rubberbanding, delayed shots, server FPS below 20 or desync with many AI units.
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Frequently asked questions (FAQ)
Arma 3 server lagging – most common cause?
Heavy AI mods (ALiVE, ACE+Zeus), too many AI units, low RAM (8 GB+ with mods), bad mod combinations.
Server FPS below 20?
Reduce AI count, remove heavy mods, consider headless client, upgrade RAM/CPU.
How much RAM for modded Arma 3?
Light modded: 8 GB. Heavy modded (30+ mods): 12–16 GB+. More players = more RAM.