Breaking: Cloudflare's Browser Run platform has been rebuilt on top of the company's own Containers, delivering up to 4x higher concurrency, a 50% drop in Quick Action response times, and 60 browser launches per minute.
Cloudflare announced today that its Browser Run service – used by developers for automated browser tasks, AI agents, and security investigations – has been migrated to a custom container infrastructure based on the company's Durable Objects platform. The update is live immediately, with no action required from users.
"We've effectively quadrupled the ceiling while halving latency," said a Cloudflare engineer involved in the project. "This is a significant leap in both capacity and responsiveness."
Background: Growing pains on shared infrastructure
Previously, Browser Run shared its compute environment with Browser Isolation (BISO), a separate product with fundamentally different usage patterns. BISO sessions are long and steady, while Browser Run demands short, bursty instances. This mismatch created scaling bottlenecks and availability delays.
"We outgrew our shared 'bunk bed' setup," the engineer noted. "BISO's larger container images also slowed down development and global distribution for Browser Run."
The team migrated to Cloudflare's newly released Durable Object-enabled Containers, which launched in open beta last year. This allowed them to spin up dedicated, lightweight environments optimized for Browser Run's workload.
The upgrade: What changed
Key improvements include the ability to spin up 60 browsers per minute via the Workers binding (up from roughly 15) and run up to 120 concurrent sessions – a 4x increase over the previous cap. Quick Action response times, covering screenshots, PDF rendering, and content extraction, fell more than 50%.
"We used a gradual migration with a Worker in the request path to test Container-powered browsers alongside the old system," the team explained. "This let us compare performance, catch bugs, and build confidence before rolling out to free, pay-as-you-go, and contract customers in that order."
No existing Worker redeployments or code changes are needed. The service is now faster, more scalable, and easier to update with new features and fixes.
What this means for developers and AI agents
For developers, this unlocks faster end-to-end testing, more aggressive security url investigations, and better PDF generation at scale. For the growing ecosystem of AI agents, Browser Run now provides a more responsive backbone for interacting with the web.
"We're building Browser Run to be the go-to platform for responsible, secure automation at massive scale," a Cloudflare product manager said. "This infrastructure change is a foundation for even bigger things to come."
The upgrade is part of Cloudflare's broader commitment to dogfooding its own products. By running internal services on Durable Object Containers, the team can fix pain points before external customers encounter them.
Browser Run continues to support the same range of quick actions: screenshots, PDFs, content extraction, and full browser automation via the Workers API. Data shows significant latency reductions in all regions globally.