Im not sure if they lag up your game or not. Like if you were for example to use a wait() on a GUI.
while wait() do
script.Parent.Text = "Money:$".. game.StarterGui.MoneyGui.Frame.Wallet.Value.Value
end
Will this lag up the game if I used it many times on different scripts?

2 comments
I'm not sure about that, but it sounds like it wouldn't!
while loops will lag your game if you use too many. wait itself does not.