Getting huge lagspikes when adding a preloaded scene?

Question

So I've got this "score popup" which is basically a label with an animation displaying what score the player got when killing a certain enemy. E.g: "+100" or "+300". Problem is that, whenever I add this scene as a child, a lag spike occurs. Why is that??

Code:

extends Node

func _ready():
    $AnimationPlayer.play("up")

func set_label(text):
    $Label.text = str(text)

Nodes:

Comments

You can use the profiler to find out which function is causing the lag spike, I doubt the functions you've posted are causing it.