DamageIndicatorClamp

Global cap for outbound ClientboundLevelParticlesPacket particles of type DAMAGE_INDICATOR.

Vanilla Player.attack(Entity) spawns one damage-indicator particle per two points of damage dealt. Plugins that boost player melee damage into the five- to seven-figure range therefore broadcast a single particle packet whose count field asks the client to instantiate hundreds of thousands of particles locally, which freezes the client.

When getMaxParticles returns a positive value, the per-version netty handler installed by PacketInteractionListener mutates any outbound damage-indicator particle packet whose count exceeds the cap so it carries the cap value instead. Other particle types and packets with a count within the cap pass through untouched.