Overview:

I'll guide you how to Optimize Flutter Application Performance. Some time many Flutter App Developers face these issues. Some major issues include Large Flutter App Size after build and Slow App Response. When Flutter developers test application's on Mobile devices they feel some lag in Apps so these are major issues we will solve these problems by optimizing Flutter Apps.


How to Optimize Flutter Apps Speed:

If you want to optimize your Flutter Android Application than follow these Steps these all steps will help you Optimize Flutter Application.

1: Reduce Application Code:

Some time in our application we write some extra code and in some cases we use too much comments in our Application so try to remove the extra code and extra comments. Some peoples will think what you mean by extra code in app?. Basically Flutter provides Custom Widget facility in Flutter App Development. So if you are using Button widget multiple times in your Application so instead of writing Button Code Multiple times use the Custom Widget technique. In this way your may be your app 40% extra code will be removed and your app will be responsive. Do same thing with extra comment code. Some time for testing purposes we Comment the code. And on release time we forget to remove the extra comment code so re check your App and try to remove this.


2: Remove Extra Packages:

Use only required Packages in your Application. Let's suppose by mistake you add the dependency of http (Used for API)but in your Application you are not using API's so http dependency is extra package in your Application. So search in your application and remove the irrelevant packages from your Application. This step is very useful for mostly Flutter Developers.

3: Extra Assets in your Application:

Don't Add extra Assets in your Applications. Let's assume If you add one image of your Company Logo in your Application and while testing application you realized no this Logo is not suitable for this App or may be any other issue. So don't keep this in your Assets remove it from Assets and than add new file. If you keep the Extra image Logo which you are not using in your Application. So the extra image will take extra spaces in your App Bundle and this will also increase your App size and while running app will consume more memory from Users.

4: Use Online Images:

Flutter is a very Developer friendly. If you think adding images in Assets folder is increasing my App Size. So don't worry Flutter Allows you to load images directly From Internet. Just write this code in your project and fetch image from any URL and show in your Flutter Application. But Before doing this step make sure you add the internet permission in your Android App Manifest file. After adding Internet Permission use this code and show images from network.



    <uses-permission
    android:name="android.permission.INTERNET"
     />


5: Don't Overload Main.dart file in Flutter:

We know when we run our Application first of all Main method will be called so this method is very important for our Flutter Applications. So don't overload this method. Let me explain this,
Don't write too much code in your main.dart file. Sometime we use Ads in our App, Firebase in our App, API Job. So try to call these all things in Flutter main.dart file so this one is a biggest mistake. When we assign too much jobs to main.dart file so it takes a lot of time to show its first screen UI. In some latest mobile phones it works smoothly because these phones have large amount of Ram but for old Phones it takes too much time to load and this thing is annoying for every user. So don't do this. Create a separate file and call this in main.dart who perform these all activities like API fetching, Ad Network Initialization etc. 


6: Don't Burden the UI of your Flutter Application:

UI is user interface of our Application. So when you design your UI in Flutter than take care of few things.

  • Don't put too much widgets on one screen
  • Use Single Child Scroll view for responsive view
  • Integrate Ads in a proper way don't over lap
  • Use Custom Widget Technique
  • Use Expanded widget (Properly Align the Widgets)
  • Try to use Network Images
Basically when you burden the UI than App takes some time to built thi UI. While doing this App show a black screen. 

7: Try your Flutter App in Release Mode:

Sometime in debug mode app show's some lag. So try your app release version. If problem is still same than use your Real Andriod Device and than test your Application. May be due to low memory of your Laptop/PC your emulator is showing some lag in Application.

8: Build App Bundle in proper way to reduce size:

When you finish your Application than build your App bundle using this process. This process will help you to reduce your Flutter App size. Which is best for your users.
Just follow this simple technique to reduce Flutter App Size. Run this Command in your Terminal before building. The Command is:

flutter clean

Run this command and wait for Some seconds when flutter cleaning process is complete than create App Bundle for your Flutter Application.