10 posts
Everyone says console.time() breaks under concurrency because the second call overwrites the first. I tested it in Node, Bun and Deno, and that is not what happens. The second timer is thrown away, the fast request reports the slow request's duration, and the slow request reports nothing at all.
A 5-per-300ms rate limit let 9 calls through in a 30 millisecond span. Not a bug — the default window type. Here is what I measured, why it happens, and the one option that fixes it.
A component that logs on every render can fire dozens of network requests per second. Here's how per-level throttle, debounce and rate-limit policies fix it — including the one-word config typo that silently brings the flood right back.
Four small resilience features that, combined, are the difference between an app that shrugs off a bad network and one that falls apart on a train.
Three cache strategies, why the cache key includes more than the URL, and how to invalidate cleanly after a mutation.
A practical walk through the vercel.json headers block I ship in production — HSTS, X-Frame-Options, X-Content-Type-Options, Permissions-Policy, and immutable long-cache for hashed assets, fonts, and images.
Why the Google Fonts <link> blocks rendering, and how importing @fontsource-variable/jetbrains-mono in your entry file ships the font with your bundle for a faster first paint.
Add lightweight, cookie-free analytics to Astro with @vercel/analytics in a tiny reusable component — what it does, when it loads, and how to wire it up.
Add fast, fully client-side search to a static Astro blog using Pagefind — no server, no API, and no query ever leaving the visitor's browser.
Mermaid is a big library, and most blog posts have zero diagrams. Here's the one-guard pattern I use so only posts that actually contain a diagram download the mermaid JavaScript.