With each release, the binary for LLRT (the Lambda Low Latency Runtime) has been increasing in size. It gains important new features and functionality, but if you don't use those features, they add bloat. In this post, I'll show you how to build a custom LLRT binary with only the dependencies you use to claw back some of the bloat and reduce your coldstart latency.
With each release of LLRT (Low Latency Runtime for Lambda), I've tried to use it to run my production API and failed. Recently I took a different approach and navigated the last few hurdles to migrate my API from Node 22 to LLRT. In this post, I'll share how I did it, the challenges I faced, and some benchmarks.
I've written a few articles on how to get faster coldstarts with Lambda, the AWS JavaScript V3 SDK and the Node runtime. It's time to put them all together and show you the Cloud Development Kit (CDK) configuration I use to achieve the fastest coldstarts with the AWS JavaScript V3 SDK and Node 22.