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)