Godot 4 Frames Per Second Explained

main.gd

extends Node2D

const FPS_DICTIONARY = {
	0: 0,
	1: 60,
	2: 30,
}

func _ready() -> void:
	set_max_fps_text()
	
func set_max_fps_text():
	$MaxFPS.text = "Max FPS: " + str(Engine.max_fps)

func _process(delta: float) -> void:
	$CurrentFPS.text = "Current FPS: " + str(Engine.get_frames_per_second())

func _on_fps_dropdown_item_selected(index: int) -> void:
	Engine.max_fps = FPS_DICTIONARY[index]
	set_max_fps_text()