Where exactly is the image optimization happening when I use the Image component? If I don't used Vercel to deploy, will there be any additional costs and considerations if I have a lot of traffic?
#What are the cost implications of using the Next.js Image component?
wide seal
lime elmBOT
Hi @wide seal. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
The image optimization happens on the server when you use the next/image component. This component extends the HTML img element with features for automatic image optimization, including size optimization, visual stability, faster page loads, and asset flexibility. It serves correctly sized images for each device, using modern image formats like WebP and AVIF, and images are only loaded when they enter the viewport using native browser lazy loading, with optional blur-up placeholders source (https://nextjs.org/docs/app/building-your-application/optimizing/images).
When you deploy your Next.js application on Vercel, images are automatically optimized on demand, keeping your build times fast while improving your page load performance and Core Web Vitals. This optimization happens on the Vercel Edge Network source (https://vercel.com/docs/frameworks/nextjs).
If you're self-hosting, the Image Optimization uses the default Next.js server for optimization. This server manages the rendering of pages and serving of static files source (https://vercel.com/docs/frameworks/nextjs).
Regarding costs, if you're using Vercel, costs are based on the number of source images during the billing period. Every time you change the value of the src prop during a billing period, an additional count will be added for that same Image component. The usage count of the source images will be reset at the beginning of each billing period source (https://vercel.com/docs/concepts/image-optimization/managing-image-optimization-costs).
If you're not using Vercel and have a lot of traffic, you might need to consider the server resources required for on-demand image optimization. If you're using next export which doesn’t include a server to optimize images, you can disable Image Optimization completely using next.config.js for all instances of next/image:
module.exports = {
images: {
unoptimized: true,
},
};
source (https://nextjs.org/blog/next-12-3)
This disables the Image Optimization API which requires a server to optimize images on demand as they’re requested.
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wide seal
@lime elm In your answer you said: "If you're not using Vercel and have a lot of traffic, you might need to consider the server resources required for on-demand image optimization." This is what I was asking in the first place. Can you elaborate?
lime elmBOT
Let me check the knowledge base for you. One moment! :books:
When you're not using Vercel and have a lot of traffic, the on-demand image optimization can put a significant load on your server because each image needs to be processed and served in an optimized format. This process involves resizing the images, converting them to a more efficient format (like WebP or AVIF), and then serving them to the client. All these operations consume CPU and memory resources on your server.
If you're self-hosting your Next.js application, the Image Optimization uses the default Next.js server for optimization. This server manages the rendering of pages and serving of static files source (https://vercel.com/docs/frameworks/nextjs). However, if you're using next export which doesn’t include a server to optimize images, you can disable Image Optimization completely using next.config.js for all instances of next/image:
module.exports = {
images: {
unoptimized: true,
},
};
source (https://nextjs.org/blog/next-12-3)
By disabling the Image Optimization, you're essentially offloading the optimization task to the client's browser or to a third-party service. This can help reduce the load on your server, but it might also affect the loading performance of your images.
If you have a lot of traffic and you're not using Vercel, you might want to consider using a third-party Image Optimization provider like Imgix, Cloudinary, or Akamai. These providers can handle the image optimization task for you, and they usually charge based on the number of images processed or the amount of data transferred source (https://nextjs.org/docs/pages/api-reference/components/image-legacy).
Remember, the choice of where to optimize your images depends on your specific needs and resources. You should consider factors like the amount of traffic you expect, the resources available on your server, and the costs associated with different solutions.
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
wide seal
@lime elm So I'm not sure I understand, it the server optimizing images on every request? I assumed the images were optimized once and then subsequent requests would get the same images?
lime elmBOT
Let me check the knowledge base for you. One moment! :books:
The Next.js Image Optimization feature works by optimizing images on-demand as they are requested by your users. When a user makes a request for an image, the server will optimize that image for the specific request parameters (like size and format), and then serve the optimized image to the user.
However, once an image has been optimized, it is cached for future requests. This means that if another user (or the same user at a later time) requests the same image with the same parameters, the server can serve the cached, optimized image instead of having to optimize the image again. This caching mechanism helps to reduce the load on your server and improve the performance of your application.
When deploying to Vercel, images are automatically optimized on demand and served from the Vercel Edge Network source (https://vercel.com/docs/frameworks/nextjs). This means that the optimized images are cached at the edge of the network, close to your users, which can help to further improve the loading performance of your images.
If you're self-hosting your Next.js application, the Image Optimization uses the default Next.js server for optimization and caching source (https://vercel.com/docs/frameworks/nextjs). The specifics of how the caching works can depend on your server configuration and the resources available on your server.
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
wide seal
@lime elm What exactly is next export?
lime elmBOT
Let me check the knowledge base for you. One moment! :books:
next export is a command provided by the Next.js CLI that allows you to export your Next.js application to static HTML, which can be run standalone without the need for a Node.js server. The exported app supports almost every feature of Next.js including dynamic routes, prefetching, preloading and dynamic imports.
When you run next export, Next.js generates an HTML file per route. By breaking a strict Single-Page Application (SPA) into individual HTML files, Next.js can avoid loading unnecessary JavaScript code on the client-side, reducing the bundle size and enabling faster page loads. The static export can be deployed and hosted on any web server that can serve HTML/CSS/JS static assets source (https://nextjs.org/docs/app/building-your-application/deploying/static-exports).
However, as of Next.js 13.3, next export is deprecated and replaced with "output": "export" in the next.config.js file. This means that you can now use next build to generate a static export of your application. The next build command will output an out directory when output: 'export' is set in next.config.js source (https://nextjs.org/blog/next-13-3).
Here's an example of how to set the output mode to 'export' in next.config.js:
/**
* @type {import('next').NextConfig}
*/
const nextConfig = {
output: 'export',
};
module.exports = nextConfig;