ENEnglish
LTLietuviškai
DEDeutsch
FRFrançais
RUРусский
ESEspañol
PLPolski
ITItaliano
UKУкраїнська
CSČeština
PTPortuguês
JA日本語
LVLatviešu valoda
ETEesti
HUMagyar
IDBahasa Indonesia
TRTürkçe
HIहिन्दी
ELΕλληνικά
ARالعربية
THไทย
VITiếng Việt
RORomână
MSBahasa Melayu
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.
2026/09/30 · 8分で読めますJavaScript 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.
2026/09/30 · 8分で読めますSpeculation 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…
2026/09/30 · 8分で読めますEmbedding 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…
2026/09/29 · 8分で読めますWeb 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…
2026/09/29 · 8分で読めますToo 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…
2026/09/29 · 9分で読めますCookie 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…
2026/09/20 · 7分で読めますBack/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…
2026/09/17 · 7分で読めますTotal 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…
2026/09/14 · 7分で読めますExcessive 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…
2026/09/12 · 7分で読めますHero 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…
2026/09/11 · 7分で読めますAre 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…
2026/09/06 · 7分で読めますMinifying 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…