Handling for ParticleOrchestrator

[pacenadhif778]

It seems there is no server-side handling for particle spawning related to ParticleOrchestrator. Under certain conditions, this can cause lag and make mobile clients crash.

[lost-werewolf]

FYI, particles can also cause severe lag for PC too. Not all particles are created equally, some are laggy at low amounts & some are laggy at high amounts. I've heard the flame wader particles are supposedly very laggy on Mac & Linux when compared to Windows.
I do think particles require a handler, but if there's going to be a spam threshold, it should be per-particle and/or controlled by TShock's config. If particles are too limited by default, it only hurts the users who are responsible with particles, while irresponsible users will just migrate to other methods of freeze/crash.

[lost-werewolf]

I did some digging at things.
The velocity (MovementVector) field should be unable to cause lag on its own for particles that can move. In fact, setting this to obscene values seems to do nothing, thankfully.
The ItemTransfer particle, for example, uses the MovementVector to determine the position to fly to.

The lag mostly comes from excessive particle counts. The game does not cap the amount of particles in any shape or form. While some particles just spawn dust/gores, the others get drawn using the Immediate mode, which... is very slow and mostly why lag occurs.
So just adding a spam threshold & disabling the player if exceeded would be enough.