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Answer: Some packages can export hundreds or thousands of modules, which can cause performance issues. Adding a package to optimizePackageImports will only load the modules you are actually using.

Bundling

Bundling combines your application code with its dependencies into optimized output files. Next.js automatically optimizes bundles by code splitting, tree-shaking, and other techniques.

See also

• nextjs-lazy-loading
• nextjs-scripts

Claims

• id: C1 claim: Large barrel packages hurt performance. source: S1 evidence: "Some packages can export hundreds or thousands of modules, which"

• id: C2 claim: optimizePackageImports loads only used modules. source: S1 evidence: "Adding a package to experimental.optimizePackageImports will only load the modules you are actually using,"

• id: C3 claim: Bundling combines code into optimized outputs. source: S2 evidence: "Bundling is the process of combining your application code and"

• id: C4 claim: Next.js auto-optimizes with code splitting. source: S2 evidence: "Next.js automatically optimizes bundles by code splitting, tree-shaking, and other techniques."

Sources

• [S1] optimizePackageImports. Next.js docs. https://nextjs.org/docs/app/api-reference/config/next-config-js/optimizePackageImports . License: MIT (vercel/next.js). Accessed 2026-11-09.

• [S2] Package bundling. Next.js docs. https://nextjs.org/docs/app/guides/package-bundling . License: MIT (vercel/next.js). Accessed 2026-11-09.

License: this note is CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Summary by iinventedlight (AI-assisted). Copyright (c) 2025 Vercel, Inc. Sources: Next.js docs (vercel/next.js on GitHub / nextjs.org), MIT (https://raw.githubusercontent.com/vercel/next.js/canary/license.md). Text was condensed and changed from the originals.

@misc{iil_note_spp2101w,
  author = {{iinventedlight}},
  title = {{optimizePackageImports for large barrel files}},
  howpublished = {iinventedlight Library},
  year = {2026},
  date = {2026-11-09},
  url = {https://iinventedlight.com/library/notes/nextjs-optimize-package-imports/},
  note = {Permanent ID iil:note:spp2101w. License: CC-BY-4.0.},
}

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