introduce _app.mdx for better performance and smallest .next/static/chunks size
#1448
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🦋 Changeset detectedLatest commit: f15aa61 The changes in this PR will be included in the next version bump. This PR includes changesets to release 7 packages
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📦 Next.js Bundle AnalysisThis analysis was generated by the next.js bundle analysis action 🤖
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| Page | Size (compressed) |
|---|---|
global |
174.16 KB (🔴 +95.97 KB) |
Details
The global bundle is the javascript bundle that loads alongside every page. It is in its own category because its impact is much higher - an increase to its size means that every page on your website loads slower, and a decrease means every page loads faster.
Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis
If you want further insight into what is behind the changes, give @next/bundle-analyzer a try!
One Hundred Five Pages Changed Size
The following pages changed size from the code in this PR compared to its base branch:
| Page | Size (compressed) | First Load | % of Budget (350 KB) |
|---|---|---|---|
/404 |
7.01 KB |
181.17 KB | 51.76% (🟢 -27.08%) |
/500 |
7 KB |
181.16 KB | 51.76% (🟢 -27.08%) |
/about/a-page.en-US |
6.97 KB |
181.13 KB | 51.75% (🟢 -27.09%) |
/about/acknowledgement.en-US |
6.96 KB |
181.12 KB | 51.75% (🟢 -27.09%) |
/about/team.en-US |
7.01 KB |
181.17 KB | 51.76% (🟢 -27.08%) |
/blog.en-US |
7.58 KB |
181.74 KB | 51.93% (🟢 -27.07%) |
/blog/swr-v1.en-US |
12.46 KB |
186.61 KB | 53.32% (🟢 -27.03%) |
/blog/swr-v1.ru |
14.13 KB |
188.29 KB | 53.80% (🟢 -26.97%) |
/docs/404-500.en-US |
7.85 KB |
182 KB | 52.00% (🟢 -27.08%) |
/docs/advanced.en-US |
7.34 KB |
181.49 KB | 51.86% (🟢 -27.08%) |
/docs/advanced/cache.en-US |
19.12 KB |
193.28 KB | 55.22% (🟢 -27.15%) |
/docs/advanced/cache.ru |
20.36 KB |
194.52 KB | 55.58% (🟢 -27.11%) |
/docs/advanced/code-highlighting.en-US |
7.8 KB |
181.96 KB | 51.99% (🟢 -27.08%) |
/docs/advanced/dynamic-markdown-import.en-US |
8.56 KB |
182.72 KB | 52.21% (🟢 -27.08%) |
/docs/advanced/file-name.with.DOTS.en-US |
7.01 KB |
181.17 KB | 51.76% (🟢 -27.08%) |
/docs/advanced/file-name.with.DOTS.es-ES |
7.03 KB |
181.18 KB | 51.77% (🟢 -26.99%) |
/docs/advanced/file-name.with.DOTS.ru |
7.08 KB |
181.23 KB | 51.78% (🟢 -27.06%) |
/docs/advanced/images.en-US |
7.25 KB |
181.41 KB | 51.83% (🟢 -27.08%) |
/docs/advanced/markdown-import.en-US |
11.3 KB |
185.46 KB | 52.99% (🟢 -27.08%) |
/docs/advanced/more/loooooooooooooooooooong-title.en-US |
7.06 KB |
181.22 KB | 51.78% (🟢 -27.08%) |
/docs/advanced/more/tree/one.en-US |
7.02 KB |
181.18 KB | 51.76% (🟢 -27.08%) |
/docs/advanced/more/tree/three.en-US |
6.97 KB |
181.12 KB | 51.75% (🟢 -27.09%) |
/docs/advanced/more/tree/two.en-US |
7.02 KB |
181.18 KB | 51.76% (🟢 -27.08%) |
/docs/advanced/performance.en-US |
9.29 KB |
183.44 KB | 52.41% (🟢 -27.08%) |
/docs/advanced/performance.es-ES |
9.46 KB |
183.62 KB | 52.46% (🟢 -26.98%) |
/docs/advanced/performance.ru |
10.1 KB |
184.25 KB | 52.64% (🟢 -27.02%) |
/docs/advanced/react-native.en-US |
8.87 KB |
183.02 KB | 52.29% (🟢 -27.07%) |
/docs/advanced/react-native.ru |
9.44 KB |
183.6 KB | 52.46% (🟢 -27.03%) |
/docs/advanced/scrollbar-x.en-US |
7.99 KB |
182.14 KB | 52.04% (🟢 -27.09%) |
/docs/arguments.en-US |
8.08 KB |
182.24 KB | 52.07% (🟢 -27.08%) |
/docs/arguments.es-ES |
8.15 KB |
182.31 KB | 52.09% (🟢 -26.99%) |
/docs/arguments.ru |
8.41 KB |
182.56 KB | 52.16% (🟢 -27.04%) |
/docs/callout.en-US |
7.13 KB |
181.29 KB | 51.80% (🟢 -27.08%) |
/docs/change-log.en-US |
7.33 KB |
181.49 KB | 51.85% (🟢 -27.07%) |
/docs/change-log.es-ES |
12.78 KB |
186.94 KB | 53.41% (🟢 -26.97%) |
/docs/change-log.ru |
12.89 KB |
187.05 KB | 53.44% (🟢 -27.04%) |
/docs/code-block-without-language.en-US |
7.16 KB |
181.32 KB | 51.81% (🟢 -27.08%) |
/docs/conditional-fetching.en-US |
7.95 KB |
182.11 KB | 52.03% (🟢 -27.09%) |
/docs/conditional-fetching.es-ES |
8.01 KB |
182.16 KB | 52.05% (🟢 -26.99%) |
/docs/conditional-fetching.ru |
8.24 KB |
182.39 KB | 52.11% (🟢 -27.03%) |
/docs/data-fetching.en-US |
8.35 KB |
182.5 KB | 52.14% (🟢 -27.06%) |
/docs/data-fetching.es-ES |
8.4 KB |
182.55 KB | 52.16% (🟢 -26.97%) |
/docs/data-fetching.ru |
8.7 KB |
182.86 KB | 52.24% (🟢 -27.01%) |
/docs/error-handling.en-US |
9.16 KB |
183.32 KB | 52.38% (🟢 -27.08%) |
/docs/error-handling.es-ES |
9.31 KB |
183.46 KB | 52.42% (🟢 -26.99%) |
/docs/error-handling.ru |
9.88 KB |
184.03 KB | 52.58% (🟢 -27.03%) |
/docs/getting-started.en-US |
14.16 KB |
188.31 KB | 53.80% (🟢 -27.10%) |
/docs/getting-started.es-ES |
14.18 KB |
188.33 KB | 53.81% (🟢 -27.00%) |
/docs/getting-started.ru |
14.81 KB |
188.96 KB | 53.99% (🟢 -27.05%) |
/docs/global-configuration.en-US |
8.24 KB |
182.4 KB | 52.11% (🟢 -27.08%) |
/docs/global-configuration.es-ES |
8.3 KB |
182.45 KB | 52.13% (🟢 -26.99%) |
/docs/global-configuration.ru |
8.6 KB |
182.76 KB | 52.22% (🟢 -27.04%) |
/docs/middleware.en-US |
9.84 KB |
184 KB | 52.57% (🟢 -27.13%) |
/docs/middleware.ru |
10.65 KB |
184.8 KB | 52.80% (🟢 -27.08%) |
/docs/mutation.en-US |
9.73 KB |
183.88 KB | 52.54% (🟢 -27.12%) |
/docs/mutation.es-ES |
9.81 KB |
183.96 KB | 52.56% (🟢 -27.02%) |
/docs/mutation.ru |
10.49 KB |
184.65 KB | 52.76% (🟢 -27.07%) |
/docs/options.en-US |
8.78 KB |
182.93 KB | 52.27% (🟢 -27.07%) |
/docs/options.es-ES |
8.93 KB |
183.09 KB | 52.31% (🟢 -26.96%) |
/docs/options.ru |
9.53 KB |
183.68 KB | 52.48% (🟢 -27.00%) |
/docs/pagination.en-US |
19.16 KB |
193.31 KB | 55.23% (🟢 -27.14%) |
/docs/pagination.es-ES |
19.51 KB |
193.67 KB | 55.33% (🟢 -27.04%) |
/docs/pagination.ru |
20.4 KB |
194.56 KB | 55.59% (🟢 -27.10%) |
/docs/prefetching.en-US |
8.41 KB |
182.56 KB | 52.16% (🟢 -27.06%) |
/docs/prefetching.es-ES |
8.49 KB |
182.65 KB | 52.19% (🟢 -26.97%) |
/docs/prefetching.ru |
8.91 KB |
183.06 KB | 52.30% (🟢 -27.01%) |
/docs/raw-layout.en-US |
7.69 KB |
181.84 KB | 51.95% (🟢 -27.07%) |
/docs/revalidation.en-US |
13.44 KB |
187.6 KB | 53.60% (🟢 -27.06%) |
/docs/revalidation.es-ES |
13.58 KB |
187.74 KB | 53.64% (🟢 -26.96%) |
/docs/revalidation.ru |
14.17 KB |
188.33 KB | 53.81% (🟢 -27.01%) |
/docs/suspense.en-US |
8.45 KB |
182.6 KB | 52.17% (🟢 -27.07%) |
/docs/suspense.es-ES |
8.5 KB |
182.66 KB | 52.19% (🟢 -26.98%) |
/docs/suspense.ru |
8.86 KB |
183.02 KB | 52.29% (🟢 -27.02%) |
/docs/typescript.en-US |
8.73 KB |
182.89 KB | 52.25% (🟢 -27.10%) |
/docs/understanding.en-US |
14.54 KB |
188.69 KB | 53.91% (🟢 -27.07%) |
/docs/understanding.es-ES |
14.53 KB |
188.69 KB | 53.91% (🟢 -26.97%) |
/docs/understanding.ru |
14.53 KB |
188.69 KB | 53.91% (🟢 -27.06%) |
/docs/with-nextjs.en-US |
8.53 KB |
182.68 KB | 52.19% (🟢 -27.07%) |
/docs/with-nextjs.es-ES |
8.66 KB |
182.81 KB | 52.23% (🟢 -26.97%) |
/docs/with-nextjs.ru |
9.04 KB |
183.2 KB | 52.34% (🟢 -27.02%) |
/docs/wrap-toc-items.en-US |
7.79 KB |
181.94 KB | 51.98% (🟢 -27.08%) |
/docs/wrap-toc-items.es-ES |
7.78 KB |
181.94 KB | 51.98% (🟢 -26.99%) |
/docs/wrap-toc-items.ru |
7.78 KB |
181.94 KB | 51.98% (🟢 -27.08%) |
/examples/auth.en-US |
7.24 KB |
181.4 KB | 51.83% (🟢 -27.07%) |
/examples/auth.es-ES |
7.25 KB |
181.4 KB | 51.83% (🟢 -26.97%) |
/examples/auth.ru |
7.28 KB |
181.43 KB | 51.84% (🟢 -27.05%) |
/examples/basic.en-US |
7.24 KB |
181.4 KB | 51.83% (🟢 -27.07%) |
/examples/basic.es-ES |
7.24 KB |
181.4 KB | 51.83% (🟢 -26.97%) |
/examples/basic.ru |
7.29 KB |
181.44 KB | 51.84% (🟢 -27.05%) |
/examples/error-handling.en-US |
7.25 KB |
181.41 KB | 51.83% (🟢 -27.07%) |
/examples/error-handling.es-ES |
7.25 KB |
181.41 KB | 51.83% (🟢 -26.97%) |
/examples/error-handling.ru |
7.28 KB |
181.44 KB | 51.84% (🟢 -27.05%) |
/examples/full.en-US |
7.23 KB |
181.38 KB | 51.82% (🟢 -27.07%) |
/examples/infinite-loading.en-US |
7.26 KB |
181.42 KB | 51.83% (🟢 -27.07%) |
/examples/infinite-loading.es-ES |
7.26 KB |
181.42 KB | 51.83% (🟢 -26.97%) |
/examples/infinite-loading.ru |
7.31 KB |
181.46 KB | 51.85% (🟢 -27.05%) |
/examples/ssr.en-US |
7.25 KB |
181.41 KB | 51.83% (🟢 -27.07%) |
/examples/ssr.ru |
7.25 KB |
181.4 KB | 51.83% (🟢 -27.06%) |
/index.en-US |
10.99 KB |
185.14 KB | 52.90% (🟢 -27.08%) |
/index.es-ES |
10.77 KB |
184.92 KB | 52.84% (🟢 -26.99%) |
/index.ru |
11.16 KB |
185.31 KB | 52.95% (🟢 -27.05%) |
/remote/[slug] |
6.94 KB |
181.1 KB | 51.74% (🟢 -27.09%) |
/remote/graphql-eslint/[[...slug]] |
6.99 KB |
181.15 KB | 51.76% (🟢 -27.09%) |
/remote/graphql-yoga/[[...slug]] |
7.01 KB |
181.17 KB | 51.76% (🟢 -27.08%) |
/test.en-US |
7.21 KB |
181.37 KB | 51.82% (🟢 -27.08%) |
Details
Only the gzipped size is provided here based on an expert tip.
First Load is the size of the global bundle plus the bundle for the individual page. If a user were to show up to your website and land on a given page, the first load size represents the amount of javascript that user would need to download. If next/link is used, subsequent page loads would only need to download that page's bundle (the number in the "Size" column), since the global bundle has already been downloaded.
Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis
The "Budget %" column shows what percentage of your performance budget the First Load total takes up. For example, if your budget was 100kb, and a given page's first load size was 10kb, it would be 10% of your budget. You can also see how much this has increased or decreased compared to the base branch of your PR. If this percentage has increased by 20% or more, there will be a red status indicator applied, indicating that special attention should be given to this. If you see "+/- <0.01%" it means that there was a change in bundle size, but it is a trivial enough amount that it can be ignored.
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I like the idea we only need to inject pageMap once !
I am also doing some exterimental about this optimization.
Concerns
_app.js is a important entry for next.js. Developers used to do a lot of customizations around this file.
- Analytics
import type { AppProps } from 'next/app';
import { Analytics } from '@vercel/analytics/react';
function MyApp({ Component, pageProps }: AppProps) {
return (
<>
<Component {...pageProps} />
<Analytics />
</>
);
}
export default MyApp;- Auth
import { SessionProvider } from "next-auth/react"
export default function App({
Component,
pageProps: { session, ...pageProps },
}) {
return (
<SessionProvider session={session}>
<Component {...pageProps} />
</SessionProvider>
)
}It seems hard to do the same customization in app.mdx ?
Possible Alternatives
Maybe we could build
- a webpack plugin used to create a virtual file which contains the pageMaps and other meta data
- a special loader just for _app.js so it could import the virtual file
totally agree the first concern can be already done nextra/packages/nextra/src/setup-underscore-app.tsx Lines 21 to 24 in 785e67c // _app.mdx
import { Analytics } from '@vercel/analytics/react'
<Analytics />for the second one need to think about how to have possibility to wrap everything with user provider |
packages/nextra/src/loader.ts
Outdated
| dynamicMetaModules: typeof window === 'undefined' ? [${dynamicMetaModules}] : [] | ||
| }) | ||
|
|
||
| export { default } from 'nextra/layout'` |
There was a problem hiding this comment.
I think nextra/layout we can move directly to nextra/setup-page to have less file size, but in another PR
packages/nextra/src/loader.ts
Outdated
| ${themeConfigImport} | ||
| ${katexCssImport} |
There was a problem hiding this comment.
these imports we can inject also in _app.mdx to yet reduce bundle size, but in another PR ;)
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@promer94 for the second concern, we could do it // _app.mdx
import { SessionProvider } from "next-auth/react"
export default function App({
Component,
pageProps: { session, ...pageProps },
}) {
return (
<SessionProvider session={session}>
<Component {...pageProps} />
</SessionProvider>
)
}But we should do not do nextra/packages/nextra/src/setup-underscore-app.tsx Lines 19 to 26 in 785e67c |
This is ok but not ideal. Since user will lost almost all the code intellisense and autocomplete in mdx. I know |
you can also write your code in typescript and import in // _app.mdx
export { default } from '../../myUnderscoreAppWrittenInTs' |
dimaMachina
changed the title
_app.{md,mdx} for better perfomance, smallest bundle size_app.mdx for better performance and smallest .next/static/chunks size
* reduce `.next/static/chunks` for 40% * autocreate _app.mdx * remove unneded spaces * polish * add tests for getDynamicMeta * tests * more tests * fix getDynamicData * Apply suggestions from code review
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In all fairness, this should have been a breaking change. It made my website not build for some time and took me a while to figure out that I had to run a build locally to create |
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@danez Can you please open a separate issue for this? It's hard to properly track this in the comments of an already merged PR. |
I am pretty sure, this will fix #1131
also, it opens the opportunity to use react context in future refactor of v3 instead of
useInternals?Update
✅ Fixed here #1463
before
after
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