use debounce:

Wait's 5 seconds before you can use it again

local debounce = false

function Touch(Event)
 if debounce == false then
debounce = true
     -- script u want here
wait(5)
debounce = false
   end
end


script.Parent.Touched:Connect(Touch)

Debounce

Debounce is a commonly used feature which makes the script wait a certain amount of timew which can then fire your code;

If we use the most commonly used; "Touched Event Line", and add debounce you will realise it does not lag.

local PartName = "Part"

local db = false

workspace[PartName].Touched:Connect(function()
       if not db then

       db = true

       print("I was touched")
       wait(5)

        db = false
       end
end)

This will wait five seconds before firing the same action;

Long Run-Lag

If you go in the dev-console; F9, then go to memory and press UntrackedMemory. UntrackedMemory, can cause a lot of lag, and many developers suffer from it

What causes UntrackedMemory?

This is a scale from worst to least;

1 - Connections 2 - While Loops 3 - Other repetitive stuff 4 - 5 - 6 -

Bad scripts example;

Connections;

script.Parent.Touched:Connect(function()
       print("Hi")
end)

Loops;

while true do
  wait()
  print("HI")

Every-time a connection occurs, it goes directly into the UntrackedMemory folder.

How to fix and good scripts

Connections;

script.Parent.Touched:Connect(function()
    print("Hi")
script.Parent.Touched:Disconnect()

Loops;

while true do
  wait()
  print("Hello")
break