AI BriefingFaster Deployments Through Improved Function Caching
Key point
Vercel improved its function caching approach to skip uploads when there are no code changes, reducing deployment times.
Details
Deployment speed has been improved by skipping function upload when there are no code changes. This can reduce build times by an average of 400–600ms, and by up to 5 seconds for large builds.
Previously, deployment-specific environment variables such as VERCEL_DEPLOYMENT_ID were included in the function payload, causing every deployment to be recognized as new even when the code was identical. Now, these variables are injected at runtime, allowing Vercel to identify unchanged functions and prevent redundant uploads.
This optimization applies to the following projects:
- Vercel Functions (when not using a framework)
- Python, Go, Ruby, Rust
The same improvement will soon be applied to Next.js projects as well, and it is automatically applied to all deployments with no additional configuration required.
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