⚡ 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 29.6% of websites from Korea.

Statistics based on 26K+ 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 Preconnect with an impressive share of 45.2%, followed by ⏳ Lazy loading with 43.2% and DNS Prefetch with 29.5%.

Preconnect 45.2%
⏳ Lazy loading 43.2%
DNS Prefetch 29.5%
Preload 23.4%
Speculation Rules 11.8%
jQuery LazyLoad 8.9%
Lazysizes 1.9%
Prefetch 1.4%
WP-Optimize 1.3%
Lozad.js 1.1%
Rocket Loader 1%
Autoptimize 0.9%
WP Fastest Cache 0.7%
PageSpeed 0.4%
Perfmatters 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.

1. Preconnect ^(-2)
6. jQuery LazyLoad ^(-7)
9. WP-Optimize ^(-2)
10. Lozad.js ^(-11)
17. Vanilla LazyLoad ^(-1)
18. Turbolinks ^(-2)
20. Critters ^(-3)
21. Yottaa ^(-8)
23. Performance Lab ^(-1)
24. Partytown ^(-3)

✨ Best Performance Optimization Technologies

Below is a more detailed list of the top 25 of the 28 performance optimization technologies used on sites from Korea, ranked by their market share.

Rank	Name	Market share
1	Preconnect Cambridge, Massachusetts, United States The rel="preconnect" attribute on HTML elements.	45.2%
2	⏳ Lazy loading Cambridge, Massachusetts, United States A technique to load non-critical images and iframes marked with the loading="lazy" attribute only when needed.	43.2%
3	DNS Prefetch Cambridge, Massachusetts, United States The rel="dns-prefetch" attribute on HTML elements.	29.5%
4	Preload Cambridge, Massachusetts, United States The rel="preload" attribute on HTML elements.	23.4%
5	Speculation Rules Mountain View, California, United States API is used to improve navigation performance by prefetching or even prerendering future navigations.	11.8%
6	jQuery LazyLoad A deprecated jQuery lazy loading plugin. FreeOpen sourceLegacy	8.9%
7	Lazysizes Berlin, Germany A fast lazy loader library for images, iframes, and scripts/widgets. FreeOpen source	1.9%
8	Prefetch Cambridge, Massachusetts, United States The rel="prefetch" attribute on HTML elements.	1.4%
9	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	1.3%
10	Lozad.js New Delhi, India Highly performant, light and configurable lazy loader for images and iframes in pure JS with no dependencies. FreeOpen source	1.1%
11	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	1%
12	Autoptimize Lokeren, Belgium A WordPress plugin that aggregates, minifies and caches scripts and styles, and defers CSS and scripts. FreeOpen source$12.99/month	0.9%
13	WP Fastest Cache Ankara, Turkey A caching plugin that speeds up WordPress sites and improves the PageSpeed Insights score. FreeOpen source$49	0.7%
14	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.	0.4%
15	Perfmatters Scottsdale, Arizona, United States A WordPress plugin designed for performance optimization. $29.95+/year	0.3%
16	Instant.Page Pau, France Uses just-in-time preloading - it preloads a page right before a user clicks on it. 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	0.1%
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	0.09%
21	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	0.06%
22	Hummingbird Melbourne, Australia A WordPress optimization plugin with built-in caching and CDN integration. FreeOpen source$15+/month	0.06%
23	Performance Lab San Francisco, California, United States A WordPress plugin that allows you to test new performance features introduced by the official WordPress Performance Team. FreeOpen source	0.05%
24	Partytown San Francisco, California, United States A lazy-loaded library to help relocate resource intensive scripts into a web worker, and off of the main thread. FreeOpen source	0.04%
25	Quicklink Mountain View, California, United States Faster subsequent page-loads by prefetching or prerendering in-viewport links during idle time. FreeOpen source	0.03%

👉 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 26,390 websites from Korea.
We currently track the presence of 34 performance optimization technologies across the web.
Of these, 28 were detected on websites from Korea.
Statistics were last calculated on May 5, 2026.
For more details, see our methodology and disclaimer.