# Workers, Durable Objects - Inspect Worker startup performance with Wrangler

Publisher-attributed story with a reviewed brief or permitted publisher paragraph. The original publisher is responsible for the linked reporting.

- Publisher: Cloudflare Developers
- Category: Cloud
- Original publication time: 2026-07-31T00:00:00Z
- First observed by NexusTechWire: 2026-10-01T15:54:33Z
- Original source: https://developers.cloudflare.com/changelog/post/2026-07-31-wrangler-startup-profile-summary/
- NexusTechWire record: https://nexustechwire.com/news/news-59dab1ed1c8968ea3a98

## From the publisher

wrangler check startup now reports your Worker's raw and compressed bundle sizes. It also summarizes local CPU activity during startup directly in your terminal. Large bundles and costly startup work can introduce cold-start latency, so use this command to find code and large dependencies that slow your Worker before it handles requests. The summary includes sampled, active, garbage collection, and idle time. Wrangler continues to save a .cpuprofile file for detailed flamegraph analysis in Chrome DevTools or VS Code. ⛅️ wrangler 4.116.0 ─────────────────────────────────────────────── ├ Building your Worker │ Worker Built!

Source license: [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/). Publisher excerpt shortened and converted to plain text. Original source license applies.

Read the full original: [Cloudflare Developers](https://developers.cloudflare.com/changelog/post/2026-07-31-wrangler-startup-profile-summary/)

This record does not reproduce the complete article or represent independent confirmation of every source claim.