Too many parts lags the game

Help and Feedback Scripting Support
1

Here’s an example I’ve done on a separated experience so I removed the Humanoid in this project and I found a way to make the NPCs run quite smoothly which doesn’t affect much the FPS feel free to let me know how you would adapt this to my project

NPCs_sample.rblx.rbxl (62.0 KB)

2

Doubled the FPS…

removed deprecated 
local PhysicsService = game:GetService("PhysicsService")
local Workspace = game:GetService("Workspace")
local RunService = game:GetService("RunService")

-- Collision
local COLLISION_GROUP_NAME = "NPC"
if not pcall(function() PhysicsService:RegisterCollisionGroup(COLLISION_GROUP_NAME) end) then end
PhysicsService:CollisionGroupSetCollidable(COLLISION_GROUP_NAME, COLLISION_GROUP_NAME, false)

-- Dossier pour NPCs
local npcsFolder = Instance.new("Folder", Workspace)
npcsFolder.Name = "NPCs"

-- Constantes
local npcCount = 2000
local SPAWN_RADIUS = 500
local SPEED = 20 -- unités par seconde

local npcs = {}

-- Création d'un NPC minimaliste
local function createNPC(id)
	local part = Instance.new("Part")
	part.Name = "NPC_" .. id
	part.Size = Vector3.new(2, 2, 2)
	part.Position = Vector3.new(math.random(-SPAWN_RADIUS, SPAWN_RADIUS), 5, math.random(-SPAWN_RADIUS, SPAWN_RADIUS))
	part.Anchored = false
	part.CanCollide = true
	part.TopSurface = Enum.SurfaceType.Smooth
	part.BottomSurface = Enum.SurfaceType.Smooth
	part.Parent = npcsFolder

	part.CollisionGroup = COLLISION_GROUP_NAME

	local attachment = Instance.new("Attachment", part)

	local linearVelocity = Instance.new("LinearVelocity")
	linearVelocity.Attachment0 = attachment
	linearVelocity.MaxForce = math.huge
	linearVelocity.RelativeTo = Enum.ActuatorRelativeTo.World
	linearVelocity.VectorVelocity = Vector3.zero
	linearVelocity.Parent = part

	local data = {
		part = part,
		linearVelocity = linearVelocity,
		target = nil,
	}

	table.insert(npcs, data)
	return data
end

-- Mouvement aléatoire
local function pickNewTarget(data)
	local x = math.random(-SPAWN_RADIUS, SPAWN_RADIUS)
	local z = math.random(-SPAWN_RADIUS, SPAWN_RADIUS)
	local y = data.part.Position.Y
	data.target = Vector3.new(x, y, z)
end

local function updateMovement(data)
	if not data.target then
		pickNewTarget(data)
	end

	local direction = (data.target - data.part.Position)
	local distance = direction.Magnitude

	if distance < 5 then
		pickNewTarget(data)
		data.linearVelocity.VectorVelocity = Vector3.zero
	else
		local unit = direction.Unit
		data.linearVelocity.VectorVelocity = unit * SPEED
	end
end

-- Création des NPCs
for i = 1, npcCount do
	createNPC(i)
end

-- Boucle de mise à jour
RunService.Heartbeat:Connect(function()
	for _, npc in ipairs(npcs) do
		updateMovement(npc)
	end
end)

print("✅ 1000 NPCs avec LinearVelocity (sans Humanoid) en déplacement fluide.")
3

Oh let’s try your solution out what did you change ?

4

Two lines … :rofl:
Huge return. Noticed it was twice as fast.

5

Is it your device or somethin because I’m testing right now and I don’t see much difference to be honest

6

Just took out the deprecated commands and replaced them as needed, nothing wild.
1st few runs your fps said 39-ish… after the switch runs were 59-ish… who knows.

7

let’s try with 10k NPC the server will probably start lagging lol

8

Yeah the game is lagging at 10k NPCs ahahahahah the FPS is below 10 sometimes wonder what is the limit toward the Roblox Game Engine