Workers - Performance and size optimization for Cloudflare adapter for Open Next
The Cloudflare adapter for Open Next v1.2 reduces bundle sizes by removing babel and unnecessary dependencies, and improves cold start times by stopping preloading of all app routes. Users will see bundle size reduction from 14 to 8MiB and approximately 100ms faster startup times by updating to the latest version.
With the release of the Cloudflare adapter for Open Next v1.0.0 in May 2025, we already had followups plans to improve performance and size ↗.
@opennextjs/cloudflare v1.2 released on June 5, 2025 delivers on these enhancements. By removing babel from the app code and dropping a dependency on @ampproject/toolbox-optimizer, we were able to reduce generated bundle sizes. Additionally, by stopping preloading of all app routes, we were able to improve the cold start time.
This means that users will now see a decrease from 14 to 8MiB (2.3 to 1.6MiB gzipped) in generated bundle size for a Next app created via create-next-app, and typically 100ms faster startup times for their medium-sized apps.
Users only need to update to the latest version of @opennextjs/cloudflare to automatically benefit from these improvements.
Note that we published CVE-2005-6087 ↗ for a SSRF vulnerability in the @opennextjs/cloudflare package.
The vulnerability has been fixed from @opennextjs/cloudflare v1.3.0 onwards. Please update to any version after this one.
Source: original entry ↗
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