⚡ Performance Optimization in Korea

Performance optimization technologies allow websites to load faster and respond more efficiently by improving how content and resources are handled and displayed to users.

Korea is an East Asian country with a population of around 52 million people.

According to our data, performance optimization technologies are used on 32.7% of websites from Korea.

Statistics based on 30K+ analyzed websites. About this data

⭐ Most Popular in 2026

The following chart shows the top performance optimization technologies on websites in Korea in 2026, based on market share.

The most popular is ⏳ Lazy loading with an impressive share of 45.1%, followed by Preconnect with 44.2% and Preload with 24.9%.

⏳ Lazy loading 45.1%
Preconnect 44.2%
Preload 24.9%
DNS Prefetch 24.1%
Speculation Rules 19.3%
jQuery LazyLoad 10%
Prefetch 2.3%
Lazysizes 1.5%
Lozad.js 1.2%
Rocket Loader 0.7%
Autoptimize 0.6%
WP Fastest Cache 0.5%
Perfmatters 0.4%
Instant.Page 0.3%
WP-Optimize 0.3%

🚀 Highlights

Here is a list of the top technologies that are more popular in Korea than worldwide.
Differences between global and country rankings are shown in parentheses.

2. Preconnect ^(-2)
3. Preload ^(-2)
6. jQuery LazyLoad ^(-7)
9. Lozad.js ^(-11)
13. Perfmatters ^(-2)
17. Vanilla LazyLoad ^(-1)
18. Turbolinks ^(-3)
20. Critters ^(-2)
21. Prerender ^(-2)
22. Beasties ^(-3)

✨ Best Performance Optimization Technologies

Below is a more detailed list of the top 25 of the 30 performance optimization technologies used on sites from Korea, ranked by their market share.

Rank	Name	Market share
1	⏳ Lazy loading Cambridge, Massachusetts, United States A technique to load non-critical images and iframes marked with the loading="lazy" attribute only when needed.	45.1%
2	Preconnect Cambridge, Massachusetts, United States The rel="preconnect" attribute on HTML <link> elements instructs browsers to establish early connections to external origins before resources are requested.	44.2%
3	Preload Cambridge, Massachusetts, United States The rel="preload" attribute on HTML <link> elements instructs web browsers to fetch important resources early before they are requested during page rendering.	24.9%
4	DNS Prefetch Cambridge, Massachusetts, United States The rel="dns-prefetch" attribute on HTML <link> elements instructs web browsers to resolve domain names for external resources before those resources are requested.	24.1%
5	Speculation Rules Mountain View, California, United States A browser API that improves navigation performance by prefetching or prerendering pages that users are likely to visit next.	19.3%
6	jQuery LazyLoad Finland A deprecated jQuery lazy loading plugin. FreeOpen sourceLegacy	10%
7	Prefetch Cambridge, Massachusetts, United States The rel="prefetch" attribute on HTML <link> elements tells the browser to download resources that are likely to be needed for future navigation when the current page is idle.	2.3%
8	Lazysizes Berlin, Germany A fast lazy loader library for images, iframes, and scripts/widgets. FreeOpen source	1.5%
9	Lozad.js New Delhi, India Highly performant, light and configurable lazy loader for images and iframes in pure JS with no dependencies. FreeOpen source	1.2%
10	Rocket Loader San Francisco, California, United States CloudFlare Rocket Loader prioritizes website content by delaying loading of all JavaScript until after rendering. Free$25+/month	0.7%
11	Autoptimize Lokeren, Belgium A WordPress plugin that aggregates, minifies and caches scripts and styles, and defers CSS and scripts. FreeOpen source$12.99/month	0.6%
12	WP Fastest Cache Ankara, Turkey A caching plugin that speeds up WordPress sites and improves the PageSpeed Insights score. FreeOpen source$49	0.5%
13	Perfmatters Scottsdale, Arizona, United States A commercial WordPress performance plugin that reduces page load times by stripping unused code and disabling unnecessary site elements. $29.95+/year	0.4%
14	Instant.Page Pau, France Uses just-in-time preloading - it preloads a page right before a user clicks on it. FreeOpen source	0.3%
15	WP-Optimize Newport, Wales, United Kingdom An all-in-one WordPress plugin that cleans your database, compresses your images, and minifies and caches your website. FreeOpen source$49/year	0.3%
16	PageSpeed Mountain View, California, United States An open-source web server module for rewriting web pages to reduce latency and bandwidth, available for Apache and Nginx. FreeOpen source	0.2%
17	Vanilla LazyLoad A lightweight and flexible script that speeds up your web application by delaying the loading of your below-the-fold images, videos and iframes until they enter the viewport. FreeOpen source	0.2%
18	Turbolinks Chicago, Illinois, United States A JavaScript library that allows web apps to behave like a single page application. FreeOpen sourceLegacy	0.2%
19	Turbo Chicago, Illinois, United States A lightweight JavaScript library that provides the speed and feel of a single-page application without requiring developers to write any JavaScript. FreeOpen source	0.2%
20	Critters San Francisco, California, United States A deprecated Webpack plugin that inlines your app's critical CSS and lazily loads the rest. FreeOpen sourceLegacy	0.07%
21	Prerender Cambridge, Massachusetts, United States A deprecated browser hint that instructed web browsers to preload and render a web page in the background before navigation occurred. Legacy	0.05%
22	Beasties Edinburgh, United Kingdom A plugin that inlines your app's critical CSS and lazy-loads the rest. FreeOpen source	0.04%
23	Yottaa Waltham, Massachusetts, United States An e-commerce-focused website optimization platform that improves page speed, strengthens security, and monitors user experience through cloud-based acceleration, analytics, and traffic control. Free$12,000+/year	0.04%
24	Quicklink Mountain View, California, United States An open-source JavaScript library from the Google Chrome team that speeds up subsequent page loads by prefetching links likely to be visited next. FreeOpen source	0.03%
25	NitroPack Sofia, Bulgaria A performance optimization solution for WordPress, WooCommerce, Magento, and OpenCart that offers caching, code, image, and font optimization, and a built-in CDN. $17.50+/month	0.02%

👉 See Also

🌎 Performance Optimization in other countries

🗃️ About This Data

We evaluate the popularity of technologies based on the number of websites where we detect their usage.
Technologies without a detectable web footprint, and those we do not track, are not reflected in the calculated market share.
This report is based on the analysis of 30,207 websites from Korea.
We currently track the presence of 34 performance optimization technologies across the web.
Of these, 30 were detected on websites from Korea.
Statistics were last calculated on September 18, 2026.
For more details, see our methodology and disclaimer.