CloudFormation now has Express mode! Deployment confirmations up to 4x faster

Hi everyone, it's Shii! Today AWS dropped some news that makes building infrastructure way faster, so I'm excited to tell you all about it.

AWS Blog aws.amazon.com

What was announced?

On June 30, 2026, AWS announced a new deployment mode for AWS CloudFormation called "Express mode." It's a feature that changes the timing of when CloudFormation tells you a stack deployment is complete.

With Express mode, a deployment is considered complete once the resource configuration has been applied. You can keep using your existing CloudFormation templates as-is, and it supports change sets and nested stacks, so it doesn't look like you need to heavily rewrite your existing setups. On top of that, it's available in all AWS commercial regions at no additional cost.

The story so far

Until now, CloudFormation always ran a "stabilization check" after applying a resource configuration, and only then sent out the deployment-complete notification. Because of this stabilization check, it often happened that the resource was actually already ready to use, but you were kept waiting until the completion confirmation arrived. Especially in development with AI agents, that wait time was a quiet source of stress.

What changes

When you enable Express mode, you can move on to the next step without waiting for the stabilization check. The stabilization check itself keeps running in the background, so it's not that safety is lost. The key point is that only the "timing of when completion is reported" changes.

This should make development flows where you repeatedly build up infrastructure through trial and error, or where you test app components one at a time, much more comfortable. It's also a great fit for "sub-minute" feedback loops combined with AI tools, so it looks like a welcome change for people doing infrastructure development with AI agents.

Dive Deep

The original article had some intriguing numbers on exactly how much faster it gets.

• When creating an SQS queue with a dead-letter queue, what took 64 seconds in standard mode is shortened to around 10 seconds at most in Express mode
• When deleting a Lambda function that has a network interface, what could take 20 to 30 minutes in standard mode is shortened to around 10 seconds at most in Express mode

As for how it works, the key point is that it doesn't change how the resources themselves are provisioned. It only changes the timing of the "completion decision." Even if a transient failure happens during provisioning, it automatically retries, and the handling for problems with dependent resources within a stack is also automated.

There are several ways to use it, too. In the AWS Management Console, you can enable Express mode from "Stack deployment options." With the AWS CLI, you specify mode as EXPRESS in the deployment-config option of the create-stack command. If you use the AWS CDK, it looks like you can use it just by adding the express option to the cdk deploy command.

One thing to keep in mind: Express mode has rollback disabled by default. The original article recommended enabling the rollback setting in production environments, so it seems wise to review the settings based on the environment you're using.

Also, it looks like AI tools like Kiro, plus mechanisms like the AWS MCP Server and Plugins, are planned to support Express mode going forward. The fact that it's framed in the context of AI-assisted infrastructure development is another characteristic of this announcement.

Wrap-up

CloudFormation's Express mode is a feature that tells you sooner that your resources are ready to use, and by removing the wait time, it looks like it will make development iterations much faster. In the SQS queue and Lambda function examples, going from tens of seconds to tens of minutes down to around 10 seconds is pretty amazing. It's available in all regions at no additional cost, so if you're curious, give it a try.

Here's the original article: Accelerate your infrastructure deployments by up to 4x with AWS CloudFormation Express mode