My game keeps on lagging how can I fix it?

Well my game is kind of laggy the last time and I used this script but it doesnt really work because everytime I use a tool alot of times then it lags and I lose connection. Can you help me? Script:

--Scan Options:
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Print_Scan_Results = true                       
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Quarantine_Instead_of_Delete = true    
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q = Instance.new("Model")
q.Name = "Quarantine"
classes = {"Fire"}
names = {"4D Being", "H75", "Hello...I åm Your New Lord Lolz", "Spread", "Anti-Lag", "Vaccine", "ayub32", "dåååååååååååååång.........you got owned...", "micolord", "", "AmazingOmegaJames"}
hidden = Instance.new("StringValue")
file = {}

function Start()
	workspace = game.Workspace:GetChildren()
	qu = q:GetChildren()
	index = {}
	virus = 0

	function Scan(object)
		for i = 1,#object do
			inside = object[i]:GetChildren()
			if Malicious(object[i]) then
				virus = virus+1
				Name(object[i])
				Quarantine(object[i])
			else
				if #inside > 0 then
					Scan(inside)
				end
			end
		end
	end 

	function Malicious(class)
		for x = 1, #classes do
			if class.className == classes[x] and #(class:GetChildren()) > 0 then return true end
		end
		for x = 1, #names do
			if string.lower(class.Name) == string.lower(names[x]) then return true end
		end
		return false
	end

	function Hidden(class)
		for x = 1, #classes do
			if class.className == classes[x] then return true end
		end
		return false
	end

	function Name(malware)
		cur = malware
		file[1] = "."..cur.Name
		while cur.Parent.Name ~= "Workspace" do
			cur = cur.Parent
			file[#file+1] = "."..cur.Name
		end
		inde = "game.Workspace"
		for j = 1, #file do
			inde = inde..file[#file+1-j]
		end
		file = {}
		inde = inde.."  ("..malware.className.." Class)"
		index[#index+1] = inde
		malware.Parent = q
	end

	function Quarantine(malware)
		if malware ~= nil then
			contain = malware:GetChildren()
			if Hidden(malware) then
				h = hidden:clone()
				h.Name = malware.Name
				h.Value = "Original Class: "..malware.className
				h.Parent = malware.Parent
				for j = 1, #contain do
					contain[j].Parent = h
				end
				malware:remove()
				malware = h
			end
			contain = malware:GetChildren()
			for j = 1, #contain do
				Quarantine(contain[j])
			end
		end
	end

	Scan(workspace)

	if virus > 0 and Quarantine_Instead_of_Delete then
		q.Parent = game.Lighting
	end

	if virus > 0 and Print_Scan_Results then
		print("--------------------")
		print("Scan Results:")
		print("Potentially malicious objects were found in the following locations:")
		for i = 1, #index do
			print(" -- "..index[i])
		end
		if Quarantine_Instead_of_Delete then
			print("These objects have been quarantined to the Lighting Directory.")
		else
			print("These objects have been removed.")
		end
		print("--------------------")
		Start()
		wait()
		Start()
	end
end

Start()
game.Workspace.ChildAdded:connect(Start)