Limits (16)

Last updated Aug 27, 2026 Cloudflare limits the number of distinct Dynamic Workers with in-flight requests. Multiple in-flight requests to the same Dynamic Worker count as one toward this limit.

In a Worker, each request has its own input/output (I/O) context. Each request can therefore have up to four distinct Dynamic Workers with in-flight requests.

A Durable Object shares one I/O context across all concurrent requests to the same object. Those requests can collectively have up to ten distinct Dynamic Workers with in-flight requests. To set lower CPU time or subrequest limits, refer to Custom resource limits.

Was this helpful?

YesNo

On this page

Docs

{"@context":"https://schema.org","@type":"TechArticle","@id":"https://developers.cloudflare.com/dynamic-workers/platform/limits/#page","headline":"Limits","description":"Limits for concurrent Dynamic Worker requests.","url":"https://developers.cloudflare.com/dynamic-workers/platform/limits/","inLanguage":"en","image":"https://developers.cloudflare.com/dynamic-workers/platform/limits/og.png?v=22cb82f706ad674b","dateModified":"2026-08-27","publisher":{"@type":"Organization","name":"Cloudflare","description":"One platform for your apps, agents, and workforce. Build, secure, and scale without managing infrastructure","url":"https://www.cloudflare.com/","sameAs":["https://github.com/cloudflare","https://www.linkedin.com/company/cloudflare","https://x.com/cloudflare"],"logo":{"@type":"ImageObject","url":"https://developers.cloudflare.com/logo.svg"},"address":{"@type":"PostalAddress","streetAddress":"101 Townsend St","addressLocality":"San Francisco","addressRegion":"CA","postalCode":"94107","addressCountry":"US"},"contactPoint":[{"@type":"ContactPoint","contactType":"Customer Support","url":"https://support.cloudflare.com/","availableLanguage":["English"]},{"@type":"ContactPoint","contactType":"Sales","url":"https://www.cloudflare.com/contact/","availableLanguage":["English"]}]},"isPartOf":{"@type":"WebSite","@id":"https://developers.cloudflare.com/#website","name":"Cloudflare Docs","url":"https://developers.cloudflare.com/"}}

description: Send transactional email and route incoming email with Cloudflare Email Service. Arbitrary-recipient sending requires Workers Paid, while routing supports Workers Free and Paid. title: Cloudflare Email Service image: https://developers.cloudflare.com/email-service/og.png?v=9f1e4a6a5ef85e5b

Skip to content

Documentation Index
Fetch the complete documentation index at: https://developers.cloudflare.com/email-service/llms.txt
Use this file to discover all available pages before exploring further.