Skip to content

perf: navigation blocked on a chunk fetch because prefetch was off #122

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
fas89 merged 1 commit into from
Sep 14, 2026
Merged

perf: navigation blocked on a chunk fetch because prefetch was off #122

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
25 changes: 23 additions & 2 deletions docs/.vuepress/config.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -41,8 +41,29 @@ export default defineUserConfig({

bundler: viteBundler(),

shouldPrefetch: false,
shouldPreload: false,
// Both of these default to TRUE in VuePress. They were set to false in the
// initial commit with no rationale, and the cost is paid on every single
// navigation: with prefetch off the built HTML carries zero
// `<link rel="prefetch">`, so clicking through to a page blocks on fetching
// that page's chunk. Measured on the built site: 0 prefetch links across 213
// pages, against 310 chunks.
//
// Turning prefetch fully back on is not right either. Of 19 MB of chunks,
// 12.4 MB is Monaco - the `ts` / `css` / `html` / `json` workers plus
// `editor.api` and `vs` - and that is reachable only from /playground/.
// Prefetching it for every visitor would trade one problem for a worse one.
//
// So: prefetch the route chunks (299 of the 310 are under 100 KB), and skip
// the editor. The remaining page chunks are what make navigation feel
// instant.
shouldPrefetch: (file, type) => {
if (type !== 'script') return false
return !/(?:ts|css|html|json)\.worker-|editor\.api-|(?:^|\/)vs-/.test(file)
},

// Preload only covers files the CURRENT page needs, so the default is simply
// correct - including on /playground/, where Monaco genuinely is needed.
shouldPreload: true,

head: [
// Favicon. This was `logo.png`, which is 69,734 bytes at 256x139 — a
Expand Down
Loading