FiveM Resmon Calculator

Resmon (Resource Monitor) is FiveM's built-in performance profiler that measures how much CPU time each script consumes per server tick. You can open it in-game by typing resmon 1 in the F8 console. Each resource shows a millisecond value representing its average CPU cost per tick.

Why it matters: FiveM servers run at 64 ticks per second by default. If your total resmon exceeds 1ms, the server starts falling behind on ticks, causing rubber-banding, delayed events, and poor player experience. Heavy scripts compound quickly — a server with 50 resources averaging 0.05ms each already sits at 2.5ms total.

The calculator above helps you plan your server's resource budget before installing scripts, identify which categories are consuming the most CPU, and compare different configurations side by side.

Server lag in FiveM is almost always caused by one of three things: high resmon, database bottlenecks, or network issues. Here's how to address each:

• High resmon scripts — Use resmon 1 to identify the heaviest scripts. Look for any resource above 0.5ms and audit its Citizen.CreateThread loops. Adding Citizen.Wait(500) or higher in non-critical loops dramatically reduces CPU usage.
• Database queries — Slow MySQL queries block the server thread. Use async queries with oxmysql or ghmattimysql. Add indexes to frequently queried columns like player identifiers.
• Too many resources — Every resource has overhead even at 0.00ms. Servers with 200+ resources will feel sluggish. Audit and remove unused scripts regularly.
• Sync events — Avoid TriggerEvent for high-frequency updates. Use state bags or KVP for persistent data instead of repeated network events.
• Entity creation — Spawning many vehicles or peds server-side is expensive. Use client-side spawning where possible and limit entity counts.

Follow this optimization checklist to keep your FiveM server running smoothly:

• ✓ Keep total resmon under 1ms for a healthy server with headroom
• ✓ Use sv_maxclients appropriate for your hardware — more players = more sync overhead
• ✓ Enable onesync infinity only if your scripts support it
• ✓ Use oxmysql instead of mysql-async for better async database performance
• ✓ Disable resources you don't use — even idle scripts consume memory
• ✓ Profile with resmon after every major script addition
• ✓ Use state bags instead of polling for player data
• ✓ Avoid Citizen.Wait(0) in loops unless absolutely necessary
• ✓ Cache frequently accessed data in memory rather than querying the database repeatedly
• ✓ Use streaming assets efficiently — large texture files increase client load times