Performance

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JavaScript Advanced

WeakMap: Attach Data to DOM Elements Without Leaking Memory

Store state against DOM nodes, cache per-object computations, keep private data - WeakMap does all three and lets the garbage collector clean up behind you.

Jan 28, 2025 2 min 1,063 Read →

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PHP Advanced

Answer First, Work Later: Post-Response Processing in PHP

Sending the confirmation email should not make the customer stare at a spinner. PHP can close the HTTP response and keep working - if you know which runtime you are on.

Oct 9, 2024 2 min 2,556 Read →

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PHP Advanced

The PHP Session Lock That's Serializing Your AJAX Calls

Fire five parallel AJAX requests at a PHP backend and watch them execute one... at... a... time. The culprit is the session file lock, and the fix is a single function call.

Sep 5, 2024 2 min 682 Read →

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PHP Intermediate

Processing a 2 GB CSV in PHP Without Running Out of Memory

file() and fetchAll() load everything into RAM and die on big datasets. Generators stream one row at a time with constant memory - and the code barely changes.

Aug 31, 2024 2 min 3,390 Read →

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CSS Advanced

content-visibility: The Rendering Shortcut Nobody Uses

One CSS property tells the browser to skip layout and paint for off-screen sections entirely. On long pages it can cut initial rendering work dramatically - no virtualization library needed.

Jul 20, 2024 2 min 3,649 Read →

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JavaScript Intermediate

Responsive JavaScript Without Resize Listeners

Checking window.innerWidth on every resize event is wasteful and drifts out of sync with your CSS. matchMedia gives JavaScript the same breakpoints CSS uses, with change events.

May 3, 2024 2 min 4,799 Read →

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JavaScript Advanced

Do the Boring Work When the Browser Is Bored: requestIdleCallback

Analytics batching, prefetching, cache warming - none of it should compete with user interaction. requestIdleCallback runs your low-priority work in the gaps.

Apr 6, 2024 2 min 4,135 Read →

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JavaScript Intermediate

Infinite Scroll Without a Single Scroll Listener

Scroll listeners fire hundreds of times per second and need throttling, math and luck. IntersectionObserver watches a sentinel element and calls you exactly when it matters.

Mar 19, 2024 2 min 1,720 Read →

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JavaScript Beginner

The Third Argument of addEventListener You've Been Ignoring

once, passive and capture change how listeners behave in ways that delete cleanup code and fix scroll jank. Most developers never touch them.

Feb 15, 2024 2 min 1,796 Read →

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JavaScript Intermediate

Why Your Analytics Miss Closing Tabs (and How sendBeacon Fixes It)

fetch() calls fired when a user closes the tab often never leave the browser. navigator.sendBeacon() exists precisely for this moment, and it is a one-line change.

Feb 5, 2024 2 min 4,434 Read →