gistfile1.txt

class Timer {
  readonly start = performance.now();

  constructor(private readonly name: string) {}

  stop() {
    const time = performance.now() - this.start;
    console.log('Timer:', this.name, 'finished in', Math.round(time), 'ms');
  }
}


  private t: Timer;

  // When change detection begins
  ngDoCheck() {
    this.t = new Timer('Cardbock block render');
  }

  // When change detection has finished:
  // child components created, all *ngIfs evaluated
  ngAfterViewChecked() {
    this.t.stop(); // Prints the time elapsed to the JS console.
  }