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Performance Optimization of the NextJs Build/Application.

Updated 29 May 2024

As a, modern web application grows and become more complex, it become extremely diffcult for manage the performance of these web applications. Popular web framework like Nextjs, provide the inbuilt support for the app performance optimization, but their also some enhancements which we can do your end for optimization.

In this blog/article, we will look at several approaches for performance optimization of Next.js application.

These topics we’re going to covered in this blog :

  • NextJs stable version
  • Dynamic Imports
  • Multizone
  • Optimizing Images
  • Caching
  • ISR (Incremental Static Regeneration)
  • Lighthouse Support
  • LCP (Largest Contentful Paint)
  • Virtualization Tools
  • Serverless Functions
  • Static Site Regenerations

Nextjs Stable Version

Using the Nextjs latest stable version , Nextjs provide the inbuild support for the performance optimization tools, such as automatic static optimization, code splitting, image optimization, font optimization, and prefetching, as well as optimizing third-party scripts. these features will have the inbuild support in the nextjs, Using the latest stable version helps to improve performance of the applications. as of right now, latest current stable version of nextjs 14.2.2.

Dynamic Imports

Dynamic Imports also known as code splitting, refers to divided the large chunk of code into the smaller chunks as a javascript module. This method helps to defer the loading client component. and only load the client component and library when they’re needed.
Benefits of using the dynamic Imports are as follows :
1. Improved Site Interaction time.
2. Low bounce rates.
3. Better site conversion rates.
4. Faster the pages load time.

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Multizones method is a technique, in which multiple apps, can be used on the single url app. At a high level, It allow’s you to multi-zones, define different parts of your application as independent “zones”, each with its own set of configuration options. User can define the multiple zones of it’s applications and can merge them into single application by using rewrites  method.

Optimizing Images

In the nextjs we can use next/image Image component , which is the NextJs inbuild component. It automatically optimize the image, with lazy loading, and compression, resizing on the basis of the device size, even you can set the priority of the image which will load first. It’s the essential Component when we use Images in the nextjs application.


Caching helps to optimizing the performance of your application, by using the caching method /hooks like useCallBack() and useMemo() hook, these hooks caching the expensive function call , and can also cache the expensive calculated value, cache is better approach for optimization purpose, but unwanted caching or unaware caching also lead to slow down the application performance. Nextjs also support the caching. nextjs caching the fetched return value at the build time , and doesn’t refetch the data again, reused the same value again.

ISR (Incremental Static Regeneration)

ISR (Incremental Static Regeneration) allows us you to use static-generation on a per-page basis, without needing to rebuild the entire site. It helps in updating and creating content on the site without need to redeploy the site,
Some Major benefits of the ISR are as follows :
1. Better Performance
2. Reduced Backend Load:
3. Faster Builds

Lighthouse Support

Lighthouse is a Google Free tools/ chrome extension. which helps to audit the performance of the web application. it calculate the performance of the application on the multiple aspects like SEO, Performance, Accessibility and much more. It’s great tool when it comes to test the performance of the web application.

LCP (Largest Contentful Paint)

LCP (Largest Contentful Paint)  one of the three Core Web Vitals metrics, It defines the time taken by the browser to load the page and appearing the largest content element on the screen. It’s the important aspects of the performance optimization, your app LCP score define the performance quality of your web app. 0-2.5 is good.

Virtualization Tools

In the web application , it’s usual requirement of the display the large list of data on the webpage , when size of data get larged like 1000+ data it slows the scrolling and in some cases it also freezed the page or screen, which is not a good practice for that reason we use method like window-virtualized for manage the large collection data, library like react-virtualized helps to achieve the virtualized in the web app.

Serverless Functions

Serverless functions has become the popular approach on the modern web development landscape
It define as the Function-as-a-Service (FaaS),  and it only execute the specific piece of code as per the event triggered. unlike traditional server based application it doesn’t require the permanent server instances for the handling incoming request, instead it execute on demand and also scale up as per requirement.

Static Site Regeneration

Static Site Regeneration is the important aspect of the nextjs application. In the static site regeneration pages get rerender at the build time of the build, which means creation of the page is already completed on the server end , before the site get launched or accessed by the user. when user try to access the page it get the pregenerated page which surely load in the faster time. Method like getStaticProps() and getStaticPaths() is important method for achieving SSR in the nextjs web applications.

Thanks for the reading , If you like this blog, also check my others blog.
How to rendered a large list of data in NextJS

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