I read it from wiki, I really like FindFirstChild() and use it a lot. But i scared my performance will be bad. What should i do?Any good built-in functions/events i can use to replace FindFirstChild()?(except WaitForChild()) The source of my information: https://developer.roblox.com/en-us/api-reference/function/Instance/FindFirstChild "Performance Note
FindFirstChild takes about 20% longer than using dot operator, and almost 8 times longer than simply storing a reference to an object. Therefore, you should avoid calling FindFirstChild in performance dependent code, such as in tight loops or functions connected to RunService.Heartbeat/RunService.RenderStepped. Store the result in a variable, or consider using ChildAdded or WaitForChild to detect when a child of a given name becomes available."
3 comments
FindFirstChild is mainly used when there is a risk that the specified reference object may be nil. In this case, the FindFirstChild will simply return nil and will not terminate the program upon error.
The WaitForChild method will yield the program until the referenced object becomes available; it will wait until the instance exists if it appears to have not found it.
This is why it is advised to be using WaitForChild as a program that is strictly dependent on requiring the referenced objects or declared allocations as if it accidentally tries to perform an action on a nil instance it will stop running and possibly cause issues down the road through collateral.