最简单的动画导致高cpu使用率和非常高的能量影响SpriteKit

这是最简单的动画:一个黑洞在屏幕中间旋转。这两行代码将cpu使用率从3%提高到31%,能量影响从低到高(有时甚至非常高):

    let actionLoop   = SKAction.repeatForever(SKAction.rotate(byAngle: CGFloat(360), duration: 1000))
    hole.run(actionLoop)

这正常吗?我读过多少类似的讨论,但没有找到明确的答案。下面是整个代码和屏幕:

import SpriteKit
import GameplayKit

class GameScene: SKScene {

// Basic for dynamic sizes step01
var width = CGFloat()
var height = CGFloat()

override func didMove(to view: SKView) {

    // Basic for dynamic sizes step02
    width = self.frame.size.width
    height = self.frame.size.height

    // test background color
    self.backgroundColor = .yellow

    // set blackhole
    let hole = SKSpriteNode(imageNamed: "blackhole")
    let startPosition = CGPoint(x: 0, y: 0)
    hole.size = CGSize(width: width/8, height: width/8)
    hole.position = CGPoint(x: startPosition.x, y: startPosition.y)


    let actionLoop   = SKAction.repeatForever(SKAction.rotate(byAngle: CGFloat(360), duration: 1000))
    hole.run(actionLoop)

    self.addChild(hole)



}

}