Latest Posts (20 found)
fasterthanli.me 4 weeks ago

Engineering a Rust optimization quiz

There are several Rust quizzes online, including one that’s literally called the “Unfair Rust Quiz” at https://this.quiz.is.fckn.gay/ , but when I was given the opportunity to record an episode of the Self-Directed Research podcast live on the main stage of EuroRust 2025 , I thought I’d come up with something special. The unfair rust quiz really deserves its name. It is best passed with a knowledgeable friend by your side.

programming Programming rust Rust
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fasterthanli.me 2 months ago

crates.io phishing attempt

Earlier this week, an npm supply chain attack . It’s turn for crates.io , the main public repository for Rust crates (packages). The phishing e-mail looks like this: Andrew Gallant on BlueSky And it leads to a GitHub login page that looks like this: Barre on GitHub Several maintainers received it — the issue is being discussed on GitHub . The crates.io team has acknowledged the attack and said they’d see if they can do something about it.

rust Rust security Security
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fasterthanli.me 2 months ago

color npm package compromised

On September 8 2025, around 13:00 UTC, someone compromised Josh Junon’s npm account (qix) and started publishing backdoored versions of his package. Someone noticed and let Josh know: Charlie Eriksen on BlueSky Josh confirmed he’d gotten pwned by a fake 2FA (two-factor authentication) reset e-mail: Josh Junon on BlueSky The phishing e-mail came from (registered 3 days prior) and claimed users had to reset their 2FA:

open-source Open Source security Security
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fasterthanli.me 3 months ago

The science of loudness

My watch has a “Noise” app: it shows d B , for decibels. Your browser does not support the video tag. My amp has a volume knob, which also shows decibels, although.. negative ones, this time. Your browser does not support the video tag. And finally, my video editing software has a ton of meters — which are all in decibel or decibel-adjacent units. Your browser does not support the video tag. How do all these decibels fit together?

data-analysis Data Analysis music Music
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fasterthanli.me 3 months ago

Summer fasterthanlime update

There are news! Cool Bear's hot tip TL;DR: If you’re a patron or sponsor, check your Profile page to get detailed explainers of every perk. You’ll need to log in. Duh. Here are all the changes I’m implementing, summarized as a table:

business Business web-development Web Development programming Programming
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fasterthanli.me 5 months ago

All color is best-effort

I do not come to you with answers today, but rather some observations and a lot of questions. Recently I was editing some video and I noticed this: Not what the finger is pointing at — the dots. Here are the separate layers this image is made up of: the background is a stock image I’ve licensed from Envato Elements: Because I use it as a background image, I’ve cranked down the exposition in the Color tab:

design Design
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fasterthanli.me 5 months ago

Introducing facet: Reflection for Rust

I have long been at war against Rust compile times. Part of the solution for me was to buy my way into Apple Silicon dreamland, where builds are, like… faster. I remember every time I SSH into an x86_64 server, even the nice 64-core ones. And another part was, of course, to get dirty with Rust itself. I wrote Why is my Rust build so slow? , which goes in-depth into rust build performance, down to rustc self-profiling even!

performance Performance rust Rust
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fasterthanli.me 6 months ago

The virtue of unsynn

There have been rumors going around, in the Reddit thread for facet , my take on reflection in Rust, which happened a bit too early, but here we are, cat’s out of the bag, let’s talk about it! Rumors that I, podcaster/youtuber fasterthanlime, want to kill serde , serialization / deserialization framework loved by many and which contributed greatly to Rust’s success, and I just wanted to address those rumors and say that…

programming Programming rust Rust open-source Open Source
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fasterthanli.me 7 months ago

Open sourcing the home CMS

I’ve been bragging about my website software for years! For… whew, it’s been 5 years! I didn't want to make a CMS! I did it out of spite! I’ve been teasing folks about the cool things I did from the beginning — here are all the articles and series I’ve written that mention it: 2020: A new website 2021: Don’t shell out! 2022: Updating fasterthanli.me 2024: Face cams: the missing guide 2024: State of the fasterthanlime

open-source Open Source shell Shell web-development Web Development
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fasterthanli.me 7 months ago

The promise of Rust

The part that makes Rust scary is the part that makes it unique. And it’s also what I miss in other programming languages — let me explain! Rust syntax starts simple. This function prints a number: And this program calls that function — it looks like any C-family language so far, we got parentheses, we got curly brackets, we got, uhh… …string interpolation isn’t very C-like I guess?

rust Rust programming Programming
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fasterthanli.me 7 months ago

That health is mental

Disclaimer : Trigger warning: depression, talk of suicide. It’s been a while since I wrote a mental health piece — but I think it’s important to occasionally stop, take a breather, and think about how we feel. deep breath I’m okay, I think? Just a little restless. For those keeping score, I went through major life events in 2023 — a divorce, a move, and the news that I might need a second round of jaw surgery.

writing Writing
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fasterthanli.me 7 months ago

More devops than I bargained for

I recently had a bit of impromptu disaster recovery , and it gave me a hunger for more! More downtime! More kubernetes manifest! More DNS! Ahhhh! The plan was really simple. I love dedicated Hetzner servers with all my heart but they are not very fungible. You have to wait entire minutes for a new dedicated server to be provisioned. Sometimes you pay a setup fee, et cetera. And at some point to server static websites and serve as a K3S server, it’s simply just too big, and approximately twice the price that I should pay.

cloud Cloud kubernetes Kubernetes devops DevOps
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fasterthanli.me 8 months ago

Impromptu disaster recovery

im-promp-tu ( ) made, done, or formed on or as if on the spur of the moment: improvised composed or uttered without previous preparation: extemporaneous Merriam-Webster On March 18th, 2025, I thought I would look into self-hosted project management solutions — something kanban-y, but.. better? This one does not spark joy. After discovering that Teamhood was awesome (and EU-based), but had a 3-seat minimum on their subscriptions, I resigned to reluctantly self-host something. made, done, or formed on or as if on the spur of the moment: improvised composed or uttered without previous preparation: extemporaneous

devops DevOps open-source Open Source
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fasterthanli.me 9 months ago

The case for sans-io

The most popular option to decompress ZIP files from the Rust programming language is a crate simply named zip — At the time of this writing, it has 48 million downloads. It’s fully-featured, supporting various compression methods, encryption, and even supports writing zip files. However, that’s not the crate everyone uses to read ZIP files. Some applications benefit from using asynchronous I/O, especially if they decompress archives that they download from the network.

rust Rust programming Programming performance Performance
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fasterthanli.me 11 months ago

Catching up with async Rust

In December 2023, a minor miracle happened: async fn in traits shipped. As of Rust 1.39, we already had free-standing async functions: …and async functions in impl blocks: But we did not have async functions in traits:

programming Programming rust Rust
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fasterthanli.me 1 years ago

Highlighted code in slides

I have obsessed about this long enough, I think it’s only fair I (and you!) get some content out of it. When I started writing this article, I was working on my P99 CONF slides. Those slides happen to include some bits of code. And because I’m a perfectionist, I would like this code to be syntax highlighted, like this:

web-development Web Development
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fasterthanli.me 1 years ago

ktls now under the rustls org

I started work on ktls and ktls-sys , a pair of crates exposing Kernel TLS offload to Rust, about two years ago . kTLS lets the kernel (and, in turn, any network interface that supports it) take care of encryption, framing, etc., for the entire duration of a TLS connection… as soon as you have a TLS connection. For the handshake itself (hellos, change cipher, encrypted extensions, certificate verification, etc.), you still have to use a userland TLS implementation.

open-source Open Source security Security rust Rust
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fasterthanli.me 1 years ago

State of the fasterthanlime 2024

It’s time for some personal and professional news! TL;DR: I started a podcast with James , I’m stable on antidepressants, I’m giving a P99 CONF about my Rust/io_uring/HTTP work , I’m trying on “they/them” as pronouns, I’m open-sourcing merde_json , rubicon and others, I got a divorce in 2023, I found a new business model. Now that we’re on the same page: let’s unpack this a bit!

rust Rust open-source Open Source
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fasterthanli.me 1 years ago

Face cams: the missing guide

I try to avoid doing “meta” / “behind the scenes” stuff, because I usually feel like it has to be “earned”. How many YouTube channels are channels about making YouTube videos? Too many. Regardless, because I’ve had the opportunity to make my own mistakes now for a few years (I started doing the video thing in earnest in 2019), and because I’ve recently made a few leaps in quality-of-life re: shooting and editing video, I thought I’d publish a few notes, if only for reference for my future self.

media Media ui UI ai AI
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fasterthanli.me 2 years ago

Just paying Figma $15/month because nothing else fucking works

My family wasn’t poor by any stretch of the imagination, but I was raised to avoid spending money whenever possible. I was also taught “it’s a poor craftsman that blames their tools”, which apparently means “take responsibility for your fuckups”, but, to young-me, definitely sounded more like “you don’t deserve nice things”. I was also taught from an early age that I was born a sinner, incapable of doing good by myself, and that all the earthly things were temptations, sent by the devil to corrupt me (further I guess?) but also temporary, and that I shouldn’t attach myself.

career Career design Design
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