aws-lambda-edge-vs-cloudfront-functions.html

AWS Lambda@Edge vs AWS CloudFront Functions — which edge runtime wins for your brief, in 2026

Two edge runtimes, side by side. AWS Lambda@Edge is aws lambda functions running on cloudfront. full node, slow cold starts, aws-locked. AWS CloudFront Functions is sub-millisecond js at cloudfront edge. lighter than lambda@edge, narrower scope. The verdict, the criteria, and the honest take below.

ALL EDGE COMPARISONS →

Verdict in one paragraph

Two AWS edge compute products. Lambda@Edge wins on runtime breadth (full Node, complex logic). CloudFront Functions wins on speed (sub-millisecond), cost, and simplicity. For AWS-locked teams, use CloudFront Functions for header / URL manipulation; use Lambda@Edge when you need real compute.

Score: AWS Lambda@Edge 2 · AWS CloudFront Functions 4

Side by side

AWS Lambda@Edge
AWS CloudFront Functions
Category
Serverless function
CDN-attached function
Language
Node.js / Python
JS (subset)
Pricing
Paid
Paid
License
Proprietary
Proprietary
Created
2017
2021
Cold start
slow
instant
PoPs
~600
~600
Node-compat
Yes
No

Decision criteria

  • Which is faster?

    AWS CloudFront Functions

    Sub-millisecond execution vs Lambda@Edge's 50–200ms cold start.

  • Which has full Node runtime?

    AWS Lambda@Edge

    Full Node + npm + libraries. CloudFront Functions is a restricted JS subset.

  • Which is cheaper?

    AWS CloudFront Functions

    Meaningfully cheaper per-request than Lambda@Edge.

  • Which is the right pick for header / URL manipulation?

    AWS CloudFront Functions

    Designed for exactly this. Sub-millisecond is the right tool.

  • Which is the right pick for complex API logic?

    AWS Lambda@Edge

    Full Node lets you call APIs, parse / generate complex bodies, etc.

  • Which is simpler to deploy?

    AWS CloudFront Functions

    Simpler deployment model. Lambda@Edge requires more CloudFront / Lambda config.

What AWS Lambda@Edge is best for

  • AWS-locked organisations with existing CloudFront deployments
  • Header rewriting, redirects, A/B routing tied to CloudFront events
  • Apps requiring full Node compatibility at the edge

Read the full AWS Lambda@Edge entry: /edge-compute/aws-lambda-edge/

What AWS CloudFront Functions is best for

  • AWS-locked teams needing fast header / URL manipulation at edge
  • Cost-sensitive AWS edge workloads (cheaper than Lambda@Edge)
  • Simple viewer-request transformations

Read the full AWS CloudFront Functions entry: /edge-compute/cloudfront-functions/

The runtime choice is the easy half — your platform integration is the hard one

The hard half is integrating with your data layer, your auth, your build pipeline. The 30-min call is where you describe your stack and your latency budget.