David Behroozi

The median latency improvement was skewed in my recent blog because the Lambda benchmark was distributed unevenly across 3 generations of arm processors. I've rerun the benchmark accounting for CPU generation and updated the post. Now I see a 20-29 ms improvement.

This is interesting. I reran a benchmark but included which generation of Graviton Lambda ran under. With 128MB when I reduced my deployment package from 5.8 MB to 4.3 MB, P50 Coldstart E2E time is 50ms faster on Graviton4, 24ms faster on Graviton3 and 3ms faster on Graviton2.

You can have wildly different Lambda cold start times depending on which underlying CPU generation your code runs on. I recently started using /proc/cpuinfo to bucket by Graviton generation to do proper comparisons. Code is something like this to determine it for arm64:

I spent a bunch of time trying to make LLRT start faster. After much yak-shaving I made it *checks notes* 8 ms faster 🫠. Nevertheless, I blogged about it: speedrun.nobackspacecrew.com/blog/2026/10...

Used the toilet bucket to bail out gaga ball for 8th grade camp. Looks like I'd also be good with a flame thrower with that form.

Had to get a little closer.

I've secured the McMenamins landing. Analog Sunday time!

I love it when I'm wrong on this type of stuff: github.com/awslabs/llrt...

There is an uncertain future of llrt with Richard Davison leaving AWS for Vercel. The request for a new release going unresponded from a contributor has a bit of foreboding: github.com/awslabs/llrt...

Found a dock float in the middle of the lake this morning. Redneck paddleboarding ensued.

I've got a real monkey paw situation here. Archie McPhee hands for scale. Do I dare make a wish?

One of the skills I've honed over the years is the ability to select the best fruit. If I serve you a fruit salad, the cantaloupe will have been slapped and it won't taste like cucumber. cooking.nytimes.com/article/how-...

I've seen tighter formations of Canada geese eh.

My doorbell camera kept saying screaming was heard every time I came home, so I oiled the door hinge. 😅

How I block unwanted traffic from reaching my serverless API with CloudFront. speedrun.nobackspacecrew.com/blog/2026/07...

Anyone else notice improvements to log ingestion speed with lambda and CloudWatch dashboards? It used to be up to a minute before my logs were visible in a dashboard, but now it seems almost real-time.

This swag cup may be the worst I've ever used. Holding the rolled handle is awkward enough, but the mouth feel of the rolled lip on the rim is even more immediately no. It will be used to hold my jankiest pens.

Longform YouTube videos should be called YouTube pants.

The serving size is 3/4 of a pickle. A wholly unreasonable unit. Presumably to have the calories round down to 0.

I'm a fan of this surrounding logs feature in the new CloudWatch Logs Analytics console.

If you've ever lost progress in Gmail for Android because you've opened a link then needed some info from the email and had to back out of the form you were filling, change it to always open links in browser: support.google.com/mail/thread/...

Submitted a PR to the lambda-perf repository to enable visualization of performance trends over time. For example, coldstarts for llrt on arm/.zip/512MB have gotten slower. See more here: github.com/maxday/lambd...

Way back I wrote an Alexa skill to tell me if it was recycling week. It effectively did a n%2===0 on the week of the year. After 8 years of node updates I can confirm it's faster and easier to just look out the window and see if my neighbors' bins are out.

They've surrounded our transfer station with roses. It's surprisingly effective at limiting the stank.

The woodcock with artistic liberties and the shrew. Doodle circa 2011.

The baby Steller's Jay is out barnstorming.

Since everyone forgot how to write json by hand after the AI meteor strike of 2021 caused permanent darkmode, Speedrun 1.55 can now generate the necessary json config to wire your GitHub markdown to your AWS accounts with just your Identity Center start url. github.com/No-Backspace...

Journeyed to Wisconsin for some cheese therapy. Shullsburg Creamery's muenster melts different and cures ails.

Finally maxed my ESM score.

I experimented today with enabling NODE_COMPILE_CACHE to see if it would make Lambda coldstarts faster. I was able to create a .zip file with the cache from a previous run. I verified node used the cache successfully with NODE_DEBUG_NATIVE="COMPILE_CACHE". It didn't reduce the coldstart time 🫠.

Anecdotally I've noticed Lambda nodejs coldstart latencies trending down but visualizing the improvement using the daily maxday numbers is hard: maxday.github.io/lambda-perf/ I pulled the data and graphed it. Indeed, it's showing a 20-30ms improvement since November last year. Here's nodejs on arm.

Getting the client ip address when using a Lambda Function Url generally works, but sometimes you get a spoofed one. In this article I cover how to workaround the undocumented mangling Lambda does to the `x-forwarded-for` header. speedrun.nobackspacecrew.com/blog/2026/03...

TIL I was still using http 1.1 to connect to my api which supported http3. Because http3 is still kind of broken in Firefox: bugzilla.mozilla.org/show_bug.cgi... and when you enable http3 in CloudFront using the CDK, it disables http2. github.com/aws/aws-cdk/...

TIL you can get edge location in your CloudFront Functions. docs.aws.amazon.com/AmazonCloudF...

Hello darkness my old friend. I just updated to JQuery 4.0.0. Ready for 10 more years of $.

PSA: There is a performance penalty when using named exports with ESM import vs. require on built-in node modules. This is why the AWS JavaScript V3 SDK has 50 ms slower Lambda coldstarts on Node 22+. Some notes here: github.com/aws/aws-sdk-...

Look, the plating and bread choice leaves room for improvement. But the flavor of my latest Persian-American cuisine; the sumac avocado toast slaps.

After many exasperated console.log's I looked at the docs and discovered CloudFront functions don't run on responses with a status code >= 400. So my edge metrics only work on successful requests. docs.aws.amazon.com/AmazonCloudF...

Seeing some Dr. Suess bird in my latte this morning

Ode to 2025. My pithy year in review. "May your 2026 involve some hand-written code and may it compile without errors." speedrun.nobackspacecrew.com/blog/2026/01...