Why do this script freeze my game / increase my ping by a lot ?

So, I was making a damage script for my game. When you attack, it creates an StringValue called "Attacking", then the touched event connects, while you have this stringvalue, you will attack the opponent. But for some reason, I was creating a barrage move. When I test it on a Dummy, the attack froze the game (in roblox studio), increase ping by ALOT (in Roblox player, can increase ping to over 25k ms. This is a server script, whenever a tool wants to damage, It will fire this script. It also gives no errors or anything.

local event = game.ReplicatedStorage.Damage
local stunhit = false
local hitt = 0
event.OnServerEvent:Connect(function(player,  partdmg, dmg, attacktime, cd, soundid, soundvolume)
	if cd == 0 then return end
	local chr = player.Character
		
	if cmd == "normalattack" then
	local candamage = Instance.new("StringValue")
	candamage.Name = "Attacking"
	candamage.Parent = chr
	candamage.Value = "NotHit"
	game.Debris:AddItem(candamage, attacktime)
	partdmg.Touched:Connect(function(hit)
	if hit.Parent:FindFirstChild("Humanoid") and chr:FindFirstChild("Attacking").Value == "NotHit" then
			if hitt == 1 then return end
			hitt = 1
			hit.Parent.Humanoid:TakeDamage(dmg)
			candamage.Value = "IsHit"
			local sound = Instance.new("Sound")
			sound.Volume = soundvolume
			sound.Name = "hitsound"
			sound.MinDistance = 1
			sound.MaxDistance = 20
			sound.SoundId = soundid
			sound.Parent = hit.Parent.Torso
			sound:Play()
			game.Debris:AddItem(sound, 5)
			wait(cd)
			hitt = 0
		end
		return
		end)
	end
end)

I managed to reduce the lag and freeze. So the problem was is that the script has to loop create the value and delete the value for 3-5 seconds. This work is too much for the server / script to handle, so I managed to reduce the work (by a lot). So now, the script will only create 1 value. And delete it when the move is over.