Transition between scenes is slow on first time - ios

Question

I tried to move between GameScene to SettingsScene and is works perfect expect first time.
In first time the game is "stuck" for 1-3 seconds and presented the SettingsScene without the transition, after first time the transition and game works perfect.
The back (between SettingsScene to GameScene) works good also in first time.
The transition code between GameScene to SettingsScene
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch: AnyObject in touches {
self.removeAllActions()
// Get the location of the touch in this scene
let location = touch.location(in: self)
// Check if the location of the touch is within the button's bounds
//Play Button
if PlayButton.contains(location) {
bannerView.isHidden = true
let newScene = PlayScene(size: (view?.bounds.size)!)
newScene.scaleMode = .aspectFill
let reveal = SKTransition.crossFade(withDuration: 1.0)
self.view?.presentScene(newScene, transition: reveal)
//Settings Button
}else if SettingsButton.contains(location) {
bannerView.isHidden = true
settingsscene?.scaleMode = .resizeFill
let reveal = SKTransition.push(with: SKTransitionDirection.down, duration: 0.7)
self.view?.presentScene(settingsscene!, transition: reveal)
}
}
}
GameScene:
var settingsscene: SKScene?
override func didMove(to view: SKView) {
/* Setup your scene here */
//
let size = self.size
DispatchQueue.global(qos: DispatchQoS.QoSClass.background).async {
[weak self] () -> Void in
self?.settingsscene = SettingsScene(size: (view.bounds.size))
}
SettingsScene:
override func didMove(to view: SKView) {
//Settings Background
settingsBackground.position = CGPoint(x: self.frame.width / 2, y: self.frame.height / 2)
settingsBackground.zPosition = -1
}
override init(size: CGSize) {
super.init()
//Settings Label
settingsLabel.text = "Settings"
settingsLabel.fontName = "AvenirNext-Bold"
settingsLabel.fontColor = UIColor.white
settingsLabel.horizontalAlignmentMode = .center
settingsLabel.verticalAlignmentMode = .center
adjustLabelFontSizeToFitRect(labelNode: settingsLabel, rect: CGRect(x:self.frame.midX, y:self.frame.midY, width: 180, height: 110), center: true)
settingsLabel.setScale(self.frame.width * 0.001)
settingsLabel.position = CGPoint(x: self.frame.midX, y: self.frame.maxY - settingsLabel.frame.height)
settingsLabel.zPosition = 1
addChild(settingsLabel)
/**** Labels ****/
//Sounds Label
soundsLabel.text = "Sounds"
soundsLabel.fontName = "AvenirNext"
soundsLabel.fontColor = UIColor.white
adjustLabelFontSizeToFitRect(labelNode: soundsLabel, rect: CGRect(x:self.frame.midX, y:settingsLabel.position.y - 20, width:110, height: 70), center: true)
soundsLabel.setScale(self.frame.width * 0.001)
soundsLabel.zPosition = 1
//Rate Label
rateLabel.text = "Rate Game"
rateLabel.fontName = "AvenirNext"
rateLabel.fontColor = UIColor.white
adjustLabelFontSizeToFitRect(labelNode: rateLabel, rect: CGRect(x:self.frame.midX, y:50, width:120, height: 110), center: true)
rateLabel.setScale(frame.width * 0.001)
rateLabel.zPosition = 1
//Twitter Label (Follow me)
twiterLabel.text = "Follow me"
twiterLabel.fontName = "AvenirNext"
twiterLabel.fontColor = UIColor.white
adjustLabelFontSizeToFitRect(labelNode: twiterLabel, rect: CGRect(x:self.frame.midX, y:10, width:17, height: 110), center: true)
twiterLabel.setScale(frame.width * 0.001)
twiterLabel.zPosition = 1
//iAP Label (Remove Ads)
iapLabel.text = "Remove Ads"
iapLabel.fontName = "AvenirNext"
iapLabel.fontColor = UIColor.white
adjustLabelFontSizeToFitRect(labelNode: iapLabel, rect: CGRect(x:self.frame.midX, y:70, width:40, height: 110), center: true)
iapLabel.setScale(frame.width * 0.001)
iapLabel.zPosition = 1
//Restore iAP Label
restoreLabel.text = "Restore Purchase"
restoreLabel.fontName = "AvenirNext"
restoreLabel.fontColor = UIColor.white
adjustLabelFontSizeToFitRect(labelNode: restoreLabel, rect: CGRect(x:self.frame.midX, y:308, width:102, height: 110), center: true)
restoreLabel.setScale(frame.width * 0.001)
restoreLabel.zPosition = 1
//About Label
aboutLabel.text = "Restore Purchase"
aboutLabel.fontName = "AvenirNext"
aboutLabel.fontColor = UIColor.white
adjustLabelFontSizeToFitRect(labelNode: aboutLabel, rect: CGRect(x:self.frame.midX, y:18, width:123, height: 312), center: true)
aboutLabel.setScale(frame.width * 0.001)
aboutLabel.zPosition = 1
//Back Button
backButton.position = CGPoint(x: self.frame.midX, y: self.frame.midY)
backButton.zPosition = 1
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func SettingsSetup() {
addChild(settingsBackground)
addChild(myLabels)
addChild(backButton)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch:AnyObject in touches {
let location = touch.location(in:self)
//BackButton Action
if backButton.contains(location) {
let newScene = GameScene(fileNamed: "GameScene")
newScene?.scaleMode = .aspectFill
let reveal = SKTransition.push(with: SKTransitionDirection.up, duration: 0.7)
self.view?.presentScene(newScene!, transition: reveal)
}
}
}
How can I fix it?