Particle effects destroy frame timing.
Optimizing Client Performance through Asset Reduction & Configuration Hardening fivem fps boost pack
Version: 1.0 Target Engine: RAGE Engine (Grand Theft Auto V / FiveM) Particle effects destroy frame timing
Add these to your server.cfg to improve all clients' FPS. Particle effects destroy frame timing.
# Disable streaming of unneeded map extras
set sv_enableMapExtras 0