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BNবাংলা#JavaScript performance
JavaScript performance is about how scripts affect loading, responsiveness and battery use on real devices. Articles tagged here explain render-blocking scripts, unused code, long tasks and third-party tags. They show how to use defer, async and code splitting safely. You will learn how to find which script is responsible for a slow page. Each guide focuses on changes that make pages respond faster to taps and clicks. These fixes matter most on mid-range phones.
30 set 2026 · 8 min di letturaJavaScript SEO Basics: Can Google See Your Content?
Google can render JavaScript, but not always quickly or completely. Learn how JavaScript affects crawling and indexing, and how to check what Google sees.
30 set 2026 · 8 min di letturaSpeculation Rules: Prerender Pages for Near-Instant Clicks
The Speculation Rules API lets browsers prefetch or prerender the next page before a click. Learn how it works, when to use it and…
30 set 2026 · 8 min di letturaEmbedding Google Maps Without Slowing Down Your Pages
A Google Maps embed can add heavy scripts to every page it appears on. Learn how to lazy-load maps, use a static preview and…
29 set 2026 · 8 min di letturaWeb Animations and Speed: Smooth Motion Without Jank
Animations can hurt LCP, CLS and INP or make pages stutter. Learn which properties are cheap to animate and how to add motion without…
29 set 2026 · 8 min di letturaToo Many HTTP Requests? When It Still Matters for Speed
Does the number of HTTP requests still matter with HTTP/2? Learn which requests slow a page, which do not, and how to cut the…
29 set 2026 · 9 min di letturaCookie Consent Banners and Page Speed: How to Keep Both
Cookie consent banners can hurt LCP, CLS and INP. Learn how banners slow pages, how to measure the damage and how to load consent…
20 set 2026 · 7 min di letturaBack/Forward Cache: How to Make Back Navigation Instant
The back/forward cache restores pages instantly when visitors press Back. Learn how bfcache works, what blocks it on many sites and how to test…
17 set 2026 · 7 min di letturaTotal Blocking Time Explained: What It Means and How to Cut It
Total Blocking Time measures how long the main thread is blocked while a page loads. Learn how TBT is calculated, how it relates to…
14 set 2026 · 7 min di letturaExcessive DOM Size: Why It Slows Pages and How to Fix It
A page with thousands of HTML elements takes longer to style, lay out and update. Learn what causes an excessive DOM size, why it…
12 set 2026 · 7 min di letturaHero Sliders and Carousels: The Hidden Cost to Page Speed
Homepage sliders look impressive but often delay the main image, add scripts and shift layouts. Learn what they cost and how to replace or…
11 set 2026 · 7 min di letturaAre Page Builders Slowing Down Your WordPress Website?
Page builders make design easy but add heavy CSS, JavaScript and markup. Learn where the cost comes from, how to measure it and how…
6 set 2026 · 7 min di letturaMinifying CSS and JavaScript: What It Really Saves You
Minification strips whitespace and comments from CSS and JavaScript. Learn what it saves next to compression, how to enable it safely and when it…