High-Frequency Real-Time Data in React: From Ring Buffers to OffscreenCanvas

I Built a Visual System Design Reference — Switch Any Architecture Between AWS, Azure, GCP & Open Source

I Built a Visual System Design Reference — Switch Any Architecture Between AWS, Azure, GCP... Tagged with systemdesign, webdev, opensource, showdev.

Inside PGO

In the previous article , we made Go code faster by changing how it computes. SIMD lets one CPU instruction work on several values at once, and the simd/archsimd and simd packages give Go access to it. Our dot product ran about 9 times faster, but the code got a lot harder to read. At the end, I promised another route to speed, one where you don’t rewrite anything. That route is Profile-Guided Optimization (PGO). You record a CPU profile of where your program spends its time and give it back to the compiler, so it can work harder on the code that is actually hot. Your source stays exactly as it was. We briefly saw it in the IR post , and today we’re going deep into it.

Isn't It Time for AVIF Everywhere?

Hosting providers, platforms, and phone makers should adopt AVIF and AV2 more widely, the author argues. Hetzner raised prices multiple times in 2026 citing rising hardware costs, partly driven by AI demand. AVIF generally compresses better than WebP at comparable quality, and the author has switched to AVIF everywhere it's supported, falling back to WebP otherwise. YouTube is preparing to move from AV1 to AV2 as early as 2027. The author also wants better native support for Apple's HEIC format alongside AVIF, and suggests users encode AVIF locally before uploading to ease server load.

Vercel Sandbox snapshot creation is now up to 10x faster

Vercel Sandbox snapshots now use an optimized indexing format, cutting median creation time from 4.4s to under 0.4s.

Locating the source of a mysterious beep with Claude

Simon Willison used Claude Code to build Beep Locator, a system that triangulates the source of an intermittent beeping sound using multiple devices as listeners. The Python web server coordinates phones, iPads and laptops over WebSockets, using Fast Fourier Transform beep detection and a chirp to align recorded clips, and Willison names the 2007 BeepBeep acoustic ranging paper as the research Claude found. The tool located the beep to within about 40cm, which turned out to be an ancient carbon monoxide detector that wanted its batteries replaced. He started with Claude Code Cloud running Opus 5.5 on his iPhone, then continued on his laptop after Fable 5.2 was released, iterating live by pushing new JavaScript to listening devices so they did not need to be manually restarted.

Learn How to Design Software Systems Like a Senior Engineer in Our New Course

Bối cảnh: Thiết kế hệ thống là kỹ năng quan trọng đối với các kỹ sư phần mềm hiện nay, đặc biệt khi ứng tuyển vào vị trí senior hoặc staff-level. Nguyên nhân kỹ thuật: Khóa học mới này tập trung vào các nguyên tắc thiết kế architecture và giải quyết bài toán scale cho hệ thống thực tế. Hệ quả: Học viên sẽ nắm vững cách thiết kế hệ thống như một senior engineer, tăng khả năng ứng tuyển vào các vị trí cao cấp. Điều đáng học: Khóa học bao gồm các case study thực tế với công nghệ như microservices, load balancing và database sharding.

Khóa học này giúp bạn nâng cao kỹ năng thiết kế hệ thống phần mềm như một kỹ sư senior.

CSS-Tricks, Version 20

Things look a little different around here? I hope so because we just pushed a site redesign! Here's everything new with the 20th(!!) version of CSS-Tricks.

Wasmtime 48 Denies Sockets by Default: What Breaks and Fixes

Wasmtime 48 denies TCP/UDP sockets by default. See what breaks, how to restore it on the CLI, and how to opt in when embedding Wasmtime.