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Expo: not loading assets on AppLoading

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1

1

Update: I build the app shortly after asking the question and found out that there is no slow loading in the app in production.
I will let the question stay, so some hopefully can benefit from my findings - that there is a big difference in performance between an Expo an a standalone app....

When my Expo app starts, the icons load slowly on Android (I have not tried on iOS). I try to use AppLoading to cache the icons, but nothing happens. The icons still show later than the rest of the components on the home screen (1-4 seconds).
Have I misunderstood how AppLoading and Font.loadAsync work? Aren't they supposed to load on the first run and then subsequent reloads will render the icons immediately?

I have asked google and followed Expo' Preloading & Caching Assets and the full working example, but nothing seem to happen.

Following Expo's "Preloading and caching Assets":

async _loadAssetsAsync() 
 const imageAssets = cacheImages([
 require("./assets/logo.png"),
 require("./assets/logoText.png"),
 ]);

 const fontAssets = cacheFonts([
 Ionicons.font,
 FontAwesome.font,
 MaterialCommunityIcons.font,
 ]);

 await Promise.all([...imageAssets, ...fontAssets]);

I have also tried requires: require("@expo/vector-icons/fonts/Ionicons.ttf")and ...Icon.Ionicons.font in the same example.

Am I missing something completely obvious like only works in production or can anyone tell me what I am doing wrong?

expo

share|improve this question

edited Mar 26 at 7:48

Kikkomann

asked Mar 25 at 22:45

KikkomannKikkomann

6699 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can you provide more information on what you mean when you say the "icons load slowly"? Is it in the order of 100ms delay, or 2 seconds, or more? Is this on iOS or Android? Can you provide repository that I can clone and try this in to verify for myself? I cannot reproduce any 'slow loading' by initializing a new project with expo init and choosing the tabs template, all of the icons load instantly.
  
  – brentvatne
  Mar 25 at 23:43
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It seems to work in the built apk so I have updated the question. I still have the issue when using the Expo SDK though. The slow loading is up to four seconds and I have only tried in on Android. I have tried to make a reproducible project, but the icons load a lot faster there so my guess is that I have an old phone and/or my code is not performant enough. Right now I am using three font types. Is it better to stick with one performance-wise or doesn't it make a noticable difference?
  
  – Kikkomann
  Mar 26 at 10:19
  

  
  
  
  

add a comment | 

1

1

Update: I build the app shortly after asking the question and found out that there is no slow loading in the app in production.
I will let the question stay, so some hopefully can benefit from my findings - that there is a big difference in performance between an Expo an a standalone app....

When my Expo app starts, the icons load slowly on Android (I have not tried on iOS). I try to use AppLoading to cache the icons, but nothing happens. The icons still show later than the rest of the components on the home screen (1-4 seconds).
Have I misunderstood how AppLoading and Font.loadAsync work? Aren't they supposed to load on the first run and then subsequent reloads will render the icons immediately?

I have asked google and followed Expo' Preloading & Caching Assets and the full working example, but nothing seem to happen.

Following Expo's "Preloading and caching Assets":

async _loadAssetsAsync() 
 const imageAssets = cacheImages([
 require("./assets/logo.png"),
 require("./assets/logoText.png"),
 ]);

 const fontAssets = cacheFonts([
 Ionicons.font,
 FontAwesome.font,
 MaterialCommunityIcons.font,
 ]);

 await Promise.all([...imageAssets, ...fontAssets]);

I have also tried requires: require("@expo/vector-icons/fonts/Ionicons.ttf")and ...Icon.Ionicons.font in the same example.

Am I missing something completely obvious like only works in production or can anyone tell me what I am doing wrong?

expo

share|improve this question

edited Mar 26 at 7:48

Kikkomann

asked Mar 25 at 22:45

KikkomannKikkomann

6699 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can you provide more information on what you mean when you say the "icons load slowly"? Is it in the order of 100ms delay, or 2 seconds, or more? Is this on iOS or Android? Can you provide repository that I can clone and try this in to verify for myself? I cannot reproduce any 'slow loading' by initializing a new project with expo init and choosing the tabs template, all of the icons load instantly.
  
  – brentvatne
  Mar 25 at 23:43
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It seems to work in the built apk so I have updated the question. I still have the issue when using the Expo SDK though. The slow loading is up to four seconds and I have only tried in on Android. I have tried to make a reproducible project, but the icons load a lot faster there so my guess is that I have an old phone and/or my code is not performant enough. Right now I am using three font types. Is it better to stick with one performance-wise or doesn't it make a noticable difference?
  
  – Kikkomann
  Mar 26 at 10:19
  

  
  
  
  

add a comment | 

Update: I build the app shortly after asking the question and found out that there is no slow loading in the app in production.
I will let the question stay, so some hopefully can benefit from my findings - that there is a big difference in performance between an Expo an a standalone app....

When my Expo app starts, the icons load slowly on Android (I have not tried on iOS). I try to use AppLoading to cache the icons, but nothing happens. The icons still show later than the rest of the components on the home screen (1-4 seconds).
Have I misunderstood how AppLoading and Font.loadAsync work? Aren't they supposed to load on the first run and then subsequent reloads will render the icons immediately?

I have asked google and followed Expo' Preloading & Caching Assets and the full working example, but nothing seem to happen.

Following Expo's "Preloading and caching Assets":

async _loadAssetsAsync() 
 const imageAssets = cacheImages([
 require("./assets/logo.png"),
 require("./assets/logoText.png"),
 ]);

 const fontAssets = cacheFonts([
 Ionicons.font,
 FontAwesome.font,
 MaterialCommunityIcons.font,
 ]);

 await Promise.all([...imageAssets, ...fontAssets]);

I have also tried requires: require("@expo/vector-icons/fonts/Ionicons.ttf")and ...Icon.Ionicons.font in the same example.

Am I missing something completely obvious like only works in production or can anyone tell me what I am doing wrong?

expo

share|improve this question

edited Mar 26 at 7:48

Kikkomann

asked Mar 25 at 22:45

KikkomannKikkomann

6699 bronze badges

async _loadAssetsAsync() 
 const imageAssets = cacheImages([
 require("./assets/logo.png"),
 require("./assets/logoText.png"),
 ]);

 const fontAssets = cacheFonts([
 Ionicons.font,
 FontAwesome.font,
 MaterialCommunityIcons.font,
 ]);

 await Promise.all([...imageAssets, ...fontAssets]);

share|improve this question

edited Mar 26 at 7:48

Kikkomann

asked Mar 25 at 22:45

KikkomannKikkomann

6699 bronze badges

share|improve this question

edited Mar 26 at 7:48

Kikkomann

asked Mar 25 at 22:45

KikkomannKikkomann

6699 bronze badges

asked Mar 25 at 22:45

KikkomannKikkomann

6699 bronze badges

asked Mar 25 at 22:45

KikkomannKikkomann

6699 bronze badges