# Ionic - Understanding Lazy Loading **URL:** \ **Category:** ionic-v3\ **Created:** [September 13, 2018, 11:15am UTC](https://forum.ionicframework.com/t/ionic-understanding-lazy-loading/141628 "2018-09-13T11:15:51Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![karvanj](https://avatars.discourse-cdn.com/v4/letter/k/da6949/32.png) [@karvanj](https://forum.ionicframework.com/u/karvanj)\ **Post date:** [September 13, 2018, 11:15am UTC](https://forum.ionicframework.com/t/ionic-understanding-lazy-loading/141628/1 "2018-09-13T11:15:51Z")
Working with ionic 3 I am finally implementing lazy loading into my apps. I have a theoretical question on performance which applies to both Ionic 3/4. Hypothetically say I have 3 pages: **Page1** **Page2** **Page3** all of which are lazy loaded. In addition say I have a modal page called: **ModalPage** This modal page is size 1.5mb. Assume ModalPage is used in Page 1 and Page 2 and included in the respective module.ts for each page (not in app.module). My question is: 1. When I load the app and I open page1 first and then push page 2 onto the stack. As ModalPage is not global and imported separately for page 1 and page 2. Does this mean my app when I open page1 will lazy-load & download the 1.5mb Modal Page and then again another instance of modal page @ 1.5mb when I push page 2 onto the stack? So in total I am downloading 3mb worth of code? 2. If above is true apart from downloading issues is there any other impact on performance? ie having multiple instances of components/pages loaded via page modules instead of globally importing the component/pages once into the app.module ---
**Author:** ![mhartington](https://sea1.discourse-cdn.com/ionicframework/user_avatar/forum.ionicframework.com/mhartington/32/137757_2.png) [@mhartington](https://forum.ionicframework.com/u/mhartington)\ **Post date:** [July 19, 2021, 9:17pm UTC](https://forum.ionicframework.com/t/ionic-understanding-lazy-loading/141628/2 "2021-07-19T21:17:32Z")
Closed on July 19, 2021, 9:17pm UTC