Angular Performance at Angular Beers in Barcelona

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 ▪ 2 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 • Caching with Service Worker
6. Lazy Loading
7. Module Struktur Page ▪ 8 AppModule … … … SharedModule Root Module Feature Modules Shared Module
8. Lazy Loading Page ▪ 9 AppModule … … … SharedModule Root Module Feature Modules Shared Module
9. Root Module with Lazy Loading Page ▪ 10 const APP_ROUTE_CONFIG: Routes = [ { path: 'home', component: HomeComponent }, { path: 'flights', loadChildren: './[…]flight-booking.module#FlightBookingModule' } ];
10. Routes for "lazy" Module Page ▪ 11 const FLIGHT_ROUTES = [ { path: '', component: FlightBookingComponent, […] }, […] }
11. Routes for "lazy" Module Page ▪ 12 const FLIGHT_ROUTES = [ { path: 'subroute', component: FlightBookingComponent, […] }, […] } flight-booking/subroute Triggers Lazy Loading w/ loadChildren
12. DEMO
13. Lazy Loading • Lazy Loading means: Loading it later • Better startup performance • Delay during execution for loading on demand
14. Preloading
15. Idea • Module that might be needed later are loaded after the application started • When module is needed it is available immediately Page ▪ 16
16. Activate Preloading Page ▪ 17 const AppRoutesModule = RouterModule.forRoot( ROUTE_CONFIG, { preloadingStrategy: PreloadAllModules });
17. Performance- Tuning with OnPush
18. DEMO
19. OnPush flights flight flight {{ flight.id }} {{ flight.id }} FlightSearch Card Card Angular just checks when “notified”
20. Activate OnPush @Component({ […] changeDetection: ChangeDetectionStrategy.OnPush }) export class FlightCard { […] @Input() flight; }
21. "Notify" about change? • Change bound data (@Input) • Angular compares just 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
22. Change Inputs flights flight flight {{ flight.id }} {{ flight.id }} FlightSearch Card Card flightold === flightnew
23. Observables and OnPush <flight-card [item]="flights$ | async" […]> </flight-card>
24. DEMO
25. Not „all or nothing“ • You can use OnPush just for selected components • Using it compleatly: Redux • @ngrx/store
26. Ahead of Time (AOT) Compilation
27. Angular Compiler HTML Template JavaScript Template Compiler
28. Approaches • JIT: Just in Time, at runtime • AOT: Ahead of Time, during build
29. 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
30. Angular CLI • ng build --prod • @ngtools/webpack with AotPlugin • Soon AngularCompilerPlugin • Can be used without CLI too
31. DEMO
32. Tree Shaking
33. Challenges • Most tree shaking tools are conservative • They just remove code when they are 100% sure • Very often, they aren't sure :-) • Solution: Angular Build Optimizer • Rewrites compiled code • Currently: Experimental
34. Sample Application w/ Angular Material
35. Caching with Service Worker
36. What are Service Workers? • Background Tasks • Web App installs them • Are activated and deactivated on demand
37. Service Worker und Caching/ Offline • Intercept requests • Decide how to respond (Cache, Network) • Same Origin Policy • Caching Patterns • Cache only • Network only • Try cache first, then network • Try network first, then cache • etc.
39. Service Worker with Workbox (sw.js) importScripts('./assets/workbox-sw.js'); const workboxSW = new WorkboxSW();
40. Service Worker with Workbox (sw.js) importScripts('./assets/workbox-sw.js'); const workboxSW = new WorkboxSW(); const networkFirst = workboxSW.strategies.networkFirst(); const cacheFirst = workboxSW.strategies.cacheFirst();
41. Service Worker with Workbox (sw.js) importScripts('./assets/workbox-sw.js'); const workboxSW = new WorkboxSW(); const networkFirst = workboxSW.strategies.networkFirst(); const cacheFirst = workboxSW.strategies.cacheFirst(); workboxSW.router.registerRoute( new RegExp('^http:\/\/www.angular.at\/api\/'), networkFirst); workboxSW.router.registerRoute(/./, cacheFirst);
42. More about this in my Medium Account • Configuration Details, Samples etc. • https://medium.com/@ManfredSteyer/angular-performance-tuning- article-series-6e3c33707b25
43. Conclusion Quick Wins Lazy Loading and Preloading AOT and Tree Shaking Caching w/ Service Worker OnPush w/ Immutables and Observables
44. Contact [mail] manfred.steyer@SOFTWAREarchitekt.at [blog] SOFTWAREarchitekt.at [twitter] ManfredSteyer