High-Performance Applications with Angular, GDG Dev Fest in Munich

Talk vom GDG Dev Fest in Munich, November 2017

Transcript

1. Through the Sound Barrier High-Performance Applications with Angular Manfred Steyer SOFTWAREarchitekt.at
2. About me… • Manfred Steyer • SOFTWAREarchitekt.at • Trainer & Consultant • Focus: Angular • Google Developer Expert (GDE) Page ▪ 3 Manfred Steyer
3. Turbo Button
4. Quick Wins Bundling Minification enableProdMode()
5. Contents • Lazy Loading and Preloading • Performance for Data Binding with OnPush • AOT and Tree Shaking
6. Lazy Loading
7. Module Structure Page ▪ 9 AppModule … … … SharedModule Root Module Feature Modules Shared Module
8. Lazy Loading Page ▪ 10 AppModule … … … SharedModule Root Module Feature Modules Shared Module
9. Root Module with Lazy Loading Page ▪ 11 const APP_ROUTE_CONFIG: Routes = [ { path: 'home', component: HomeComponent }, { path: 'flights', loadChildren: './[…]flight-booking.module#FlightBookingModule' } ];
10. Routes for "lazy" Module Page ▪ 12 const FLIGHT_ROUTES = [ { path: '', component: FlightBookingComponent, […] }, […] }
11. DEMO
12. Lazy Loading • Lazy Loading means: Loading it later • Better startup performance • Delay during execution for loading on demand
13. Preloading
14. Idea • Module that might be needed later are loaded after the application started • When module is needed it is available immediately Page ▪ 17
15. Activate Preloading Page ▪ 18 … imports: [ […] RouterModule.forRoot( ROUTE_CONFIG, { preloadingStrategy: PreloadAllModules }); ] …
16. Performance- Tuning with OnPush
17. DEMO
18. OnPush flights flight flight {{ flight.id }} {{ flight.id }} FlightSearch Card Card Angular just checks when “notified”
19. "Notify" about change? • Change bound data (@Input) • OnPush: Angular just compares the object reference! • e. g. oldFlight === newFlight • Raise Event within the component • Notify a bound observable • Trigger it manually • Don't do this at home ;-) • At least: Try to avoid this
20. Activate OnPush @Component({ […] changeDetection: ChangeDetectionStrategy.OnPush }) export class FlightCard { […] @Input() flight; }
21. Change Inputs flights flight flight {{ flight.id }} {{ flight.id }} FlightSearch Card Card flightold === flightnew
22. Observables and OnPush <div *ngFor="let f of fligths$ | async"> … </div>
23. DEMO
24. Ahead of Time (AOT) Compilation
25. Angular Compiler HTML Template JavaScript Template Compiler
26. Approaches • JIT: Just in Time, at runtime • AOT: Ahead of Time, during build
27. Advantages of AOT • Better Startup-Performance • Smaller Bundles: You don't need to include the compiler! • Tools can easier analyse the code • Remove not needed parts of frameworks • Tree Shaking • Huge improvements w/ Angular 5 and CLI 1.5 b/c of Build Optimizer
28. Angular CLI • ng build --prod • AngularCompilerPlugin • WebPack-Plugin • Can be used without CLI too
29. DEMO
30. Sample Application w/ Angular Material
31. DEMO
32. More about this in my Medium Account • Configuration Details, Samples etc. • https://medium.com/@ManfredSteyer/angular-performance-tuning- article-series-6e3c33707b25
33. Conclusion Quick Wins Lazy Loading OnPush w/ Immutables and Observables AOT and Tree Shaking
34. Contact and Downloads [mail] manfred.steyer@SOFTWAREarchitekt.at [blog] SOFTWAREarchitekt.at [twitter] ManfredSteyer