Angular 2 - PERFORMANCE

auth.guard.ts

import { Injectable } from '@angular/core';
import { Router, CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
import { ApiService } from '../services/api.service';

@Injectable()
export class AuthGuard implements CanActivate {
  constructor(private router:Router, private _apiService:ApiService) {}

  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot){
    console.log('AuthGuard#canActivate called');
    return this._apiService.loginByToken().then((logged) => {
      if (logged === false){
        localStorage.removeItem('authToken');
        this.router.navigate(['users', 'login']);
        return false;
      }
      return true;
    }).catch((error)=>{
      localStorage.removeItem('authToken');
      this.router.navigate(['users', 'login']);
    });
  }
}