Using Ionic 3 lazy loading can cause delays when loading large HTML files

Question

Using Ionic 3 lazy loading can cause delays when loading large HTML files

My current project involves using Ionic 3, and I'm facing some challenges with lazy loading.

The ResultPage, which has a template named resultpage.html, contains over 1000 lines of HTML code. In the HomePage, my intention is to navigate to the ResultPage by using navCtrl.setRoot. However, upon calling this function, the screen freezes for approximately 3-4 seconds before redirecting me to the ResultPage. This delay results in a poor user experience. The issue only occurs with large templates, specifically the first time I access that page. To address this problem, I removed lazy loading from the ResultPage, and the lag disappeared. I am uncertain if this is the correct approach. Could someone provide guidance on what steps I should take in this situation?

Thank you very much!

angular typescript ionic-framework ionic2 ionic3

Answer 1

Answer №1

To conceal this information from the user, consider employing lazy loading in your application while also implementing preloading eagerly for specific pages. For more details, refer to the documentation.

By default, preloading is disabled, so adjusting this property will have no effect. Eagerly preloading all deep links upon app launch rather than on demand enhances performance. To enable preloading, set preloadModules to true in the main application module configuration:

@NgModule({
  declarations: [
    MyApp
  ],
  imports: [
    BrowserModule,
    IonicModule.forRoot(MyApp, {
      preloadModules: true // <- Enable here!
    })
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp
  ]
})
export class AppModule { }

If preloading is enabled, modules are loaded based on their priority setting. Priorities can be "high", "low", or "off". Modules without a specified priority default to "low".

Modules with "high" priority load first, followed by those with "low" or no priority.

You can set priority simply by including it in the @IonicPage decorator:

@IonicPage({
  name: 'my-page',
  priority: 'high'
})

In your scenario, consider setting high priority for:

The initial screens users interact with when launching the app (e.g., HomePage)
The ResultPage to ensure faster loading when users navigate to it.

Note: Preloading pages eagerly could impact app startup time, so preload only essential pages to minimize any delay.

Answer 2

To conceal this information from the user, consider employing lazy loading in your application while also implementing preloading eagerly for specific pages. For more details, refer to the documentation.

By default, preloading is disabled, so adjusting this property will have no effect. Eagerly preloading all deep links upon app launch rather than on demand enhances performance. To enable preloading, set preloadModules to true in the main application module configuration:

@NgModule({
  declarations: [
    MyApp
  ],
  imports: [
    BrowserModule,
    IonicModule.forRoot(MyApp, {
      preloadModules: true // <- Enable here!
    })
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp
  ]
})
export class AppModule { }

If preloading is enabled, modules are loaded based on their priority setting. Priorities can be "high", "low", or "off". Modules without a specified priority default to "low".

Modules with "high" priority load first, followed by those with "low" or no priority.

You can set priority simply by including it in the @IonicPage decorator:

@IonicPage({
  name: 'my-page',
  priority: 'high'
})

In your scenario, consider setting high priority for:

The initial screens users interact with when launching the app (e.g., HomePage)
The ResultPage to ensure faster loading when users navigate to it.

Note: Preloading pages eagerly could impact app startup time, so preload only essential pages to minimize any delay.

Using Ionic 3 lazy loading can cause delays when loading large HTML files

Answer №1

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