When the tool Is unequipped, It causes massive amount of lag, why Is that?

The title says It all, when the tool Is unequip, It causes massive lag, however It stops when the beams despawn

Edit: Lag happens ONLY In testing

Script:

local Tool = script.Parent

Tool.RemoteEvent.OnServerEvent:Connect(function()
	local Anim = Tool.Parent.Humanoid:FindFirstChild("Animator"):LoadAnimation(Tool.Animation)
	Anim:Play()
	wait(2.43)
	Tool.RandomSound:Play()
	local Lazer = Instance.new("Part",game.Workspace)
	local Lazer2 = Instance.new("Part",game.Workspace)
	Lazer.Position = Tool.Parent.Torso.Position
	Lazer.Orientation = Tool.Parent.Torso.Orientation
	Lazer.Size = Vector3.new(1.716, 1.741, 0.412)
	Lazer.CanCollide = false
	Lazer.Anchored = true
	Lazer.CastShadow = false
	Lazer.Material = Enum.Material.Neon
	Lazer2.Position = Tool.Parent.Torso.Position
	Lazer2.Orientation = Tool.Parent.Torso.Orientation
	Lazer2.Size = Vector3.new(0.578, 1.741, 1.267)
	Lazer2.CanCollide = false
	Lazer2.Anchored = true
	Lazer2.CastShadow = false
	Lazer2.Material = Enum.Material.Neon
	for i=0, 50 do
		Lazer.Size = Lazer.Size + Vector3.new(0,0,2)
		Lazer.BrickColor = BrickColor.random()
		Lazer2.Size = Lazer2.Size + Vector3.new(2,0,0)
		Lazer2.BrickColor = BrickColor.random()
		Lazer.Touched:Connect(function(hit)
			local Humanoid = hit.Parent:WaitForChild("Humanoid")
			if Humanoid ~= Tool.Parent.Humanoid then
				Humanoid:TakeDamage(50)
				Humanoid.Sit = true
			end
		end)
		Lazer2.Touched:Connect(function(hit)
			local Humanoid = hit.Parent:WaitForChild("Humanoid")
			if Humanoid ~= Tool.Parent.Humanoid then
				Humanoid:TakeDamage(50)
				Humanoid.Sit = true
			end
		end)
		wait(.01)
	end
	game:GetService("Debris"):AddItem(Lazer,0)
	game:GetService("Debris"):AddItem(Lazer2,0)
end)