[SOLVED] Player killer script: What can i do to avoid lag?

I've made an explosion using a sphere and TweenService. I've also made a script which has to kill the player using a character explosion, but the game starts to lag during the explosion until it crashes. I've added some delays and a debounce value, but the script continues to cause heavy lag.

Here's the "PlayerKiller" script:

local done = false

function ontouch(hit)
    if not done then
        done = true
    if hit.Parent and game.Players:GetPlayerFromCharacter(hit.Parent) then
        local exp = Instance.new('Explosion')
        exp.Position = hit.Position
        exp.Parent = workspace
    end
    else
        wait(2)
        done = false
    end
    wait(1)
end

wait(1)
script.Parent.Touched:Connect(ontouch)