Here we have discussed the 10 optimization techniques that can help you improve your React Native app’s speed and performance. Let's Check.

1. 10 Ways to Boost
the Performance of
React Native Apps

2. TABLE OF CONTENTS
Speed up the Launch Render Animations with NativeDriver
Improve Debugging Speed Optimize your Images
Incorporate Suitable Navigation Optimize React Native Code
Avoid Using the Scroll View No Arrow Functions
Cache the Image Files No Arrow Functions

3. Cross-platform app developers vouch for React Native as the most popular framework that
offers agility and flexibility. While providing more native-like functionality, this framework
boasts of using inherent features to make the apps functional and desirable. However, this
application framework comes with its issues, especially regarding its performance. You
would have heard how the support for animation is restricted, and this platform doesn't
offer parallel processing. These heavy lifting interactions can reduce the speed and impact
the overall performance.
INTRODUCTION
The community is continuously working towards enhancing the framework to support
different functions. But, despite all the various inputs, the apps suffer if there are too many
functions added to them. So, is this the end of the road? Not really! Even if the community
hasn't been able to make the app foolproof for complex functionality, they have identified
ways to improve the performance. Before we dive into how to improve React Native
performance, let's look at what hinders the performance.

4. #1. Speed up the Launch
The app’s speed is gauged by how fast it is
launched. For this purpose, you might
need to ensure proper rendering, reduce
the app's memory usage, and reduce the
bundle size. There are functions within
React Native that can help you perform
these functions and enhance the
performance. We will take you through the
two most utilized performance enhancers.

5. #2. Improve Debugging Speed
Productivity and app speed is hampered
excessively by the debugging rate. You will
notice that the number of bugs in an app
can lower agility. If you want to speed up
the process and ensure the removal of all
the bugs, you should use Flipper. It works
well with React Native and native app
systems. The layout comprises of network
inspector and contains a detailed log.
10 Ways to Boost your React Native
Application Performance

6. #3. Incorporate Suitable Navigation
Navigation can be a speed breaker for your
app. It can put your app into questionable
performance mode. The best way to deal
with it is to incorporate the best-fit
animation methods. Here are the four
approaches to improve navigation for your
application.

7. #4. Avoid Using the Scroll View
ScrollView and FlatList are two ways to
render lists on your application. This helps
get the scrollable lists on the app interface.
ScrollView is simpler to implement and can
render the list with ease. The only issue
with this component list view is that you
render all the components. This will impact
performance in case the list comprises
endless views. It will complicate data
handling and slow the app's speed.

8. #5. Cache the Image Files
In React Native, the developers coded the
image file as a core component. When you
code this component, you may face several
issues:
● It may render many images on a
single screen
● You might notice problems related to
image loading speed
● The cache loading may take a while
● You may experience image flickering

9. #6. Render Animations with NativeDriver
We have already discussed how animations
can impact the speed of your code. It can
prevent you from rendering huge
applications. To ensure the smooth
rendering of animated apps, you can use the
nativeDriver function. As the name suggests,
the function ensures that your animations
are passed over the native bridge before
processing them on the interface. Your
animation would be executed independently
and not with the JavaScript threads.

10. #7. Optimize your Images
While caching will help with re-rendering,
you may want to ensure that images don’t
delay your app launch. As a result, it is
essential to optimize your images to
improve app performance. When you are
rendering an app that consists of too many
images, it can use up a lot of memory. You
can improve the resolution and size to suit
the application to avoid that.

11. #8. Optimize React Native Code
The code ensures you don’t spend too
much time and memory while rendering.
Optimizing the code is standard practice
and helps deliver suitable applications. It
would help if you used PureComponent for
text to don’t override the codes and impact
the performance. Define the functions and
the code correctly and introduce the code
that works best in this case.

12. #9. No Arrow Functions
If you have been a React Developer for a
while, you know how arrow functions can
cause re-renders that waste the memory.
These callbacks lead to rendering views,
and every render creates a new instance
for the same process. As a result, it
hampers speed, agility, and performance.

13. #10. Implement Memory Optimization
When you are rendering apps or even
launching them, you will notice a lot of
apps running in the background. You will
need to use XCode for iOS and Android
Device Monitor for Android Studio to watch
these unnecessary apps. You need to make
sure your app code is optimized to identify
memory leaks and improve memory usage.
For this purpose, you should use Flatlist for
scrollview. You can also use sectionlist and
virtual list.

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