Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
/svc/desking/1003/LifenCulture/202604/A10717658_234_20260...	0.0 ms	2.0 MiB
/news/cms/2026/04/15/news-p.v1.20260415.a94609f028f448eea...	0.0 ms	1.5 MiB
/svc/desking/1003/index/202604/X20250829165731_226_202604...	0.0 ms	1.3 MiB
/news/cms/2026/04/14/news-p.v1.20260414.a79f341968d3408cb...	0.0 ms	1.3 MiB
/news/cms/2026/04/15/rcv.YNA.20260415.PYH2026041507940001...	0.0 ms	1.1 MiB
/news/cms/2026/04/15/news-p.v1.20260415.a8bc6d937bf24b03b...	0.0 ms	973.8 KiB
/news/cms/2026/04/15/rcv.YNA.20260415.PYH2026041509070001...	0.0 ms	942.1 KiB
/news/cms/2026/04/14/rcv.YNA.20260414.PYH2026041406080005...	0.0 ms	907.4 KiB
/news/cms/2026/04/15/rcv.YNA.20260322.PYH2026032203500001...	0.0 ms	886.8 KiB
wimg.heraldcorp.com/svc/desking/1003/series/202601/null_248_20260114162616.png	0.0 ms	848.2 KiB
/news/cms/2026/04/15/news-p.v1.20260415.e7309fb70c024e558...	0.0 ms	790.5 KiB
/news/cms/2026/04/15/news-p.v1.20260415.ac740ef38c3f44108...	0.0 ms	750.0 KiB
/news/cms/2026/04/15/news-p.v1.20260415.ba48d7e9060c4f23a...	0.0 ms	648.9 KiB
/news/cms/2026/04/15/news-p.v1.20260415.cd41881b69324a588...	0.0 ms	506.7 KiB
/news/cms/2026/04/15/news-p.v1.20260415.ec8c55107e4f48579...	0.0 ms	495.1 KiB
/news/cms/2026/04/15/rcv.YNA.20260414.PAF2026041415700100...	0.0 ms	486.3 KiB
/news/cms/2026/04/15/news-p.v1.20260415.4dfd435e1f5d4bdf8...	0.0 ms	475.1 KiB
static.heraldcorp.com/wbazic/kh/mobile/image/kh_event_bnn_1600x900_260330.jpg	10800.0 s	611.5 KiB
/news/cms/2026/04/15/news-p.v1.20260415.cdee5da7c837489fb...	0.0 ms	393.5 KiB
/news/cms/2026/04/15/news-p.v1.20260415.ec6b5e90d600402aa...	0.0 ms	319.7 KiB
/news/cms/2026/04/13/news-p.v1.20260413.f89604c15d7e4fd9b...	0.0 ms	310.9 KiB
/news/cms/2026/04/14/news-p.v1.20260414.77451bf6eb434edeb...	0.0 ms	297.9 KiB
/svc/desking/1003/series/202507/X20250708141128_248_20250...	0.0 ms	246.5 KiB
/svc/desking/1003/index/202604/X20250829165707_226_202604...	0.0 ms	193.4 KiB
/svc/desking/1003/index/202604/X20250905100912_226_202604...	0.0 ms	175.4 KiB
/news/cms/2026/04/15/news-a.v1.20260415.fc4d257c631d4d7a8...	0.0 ms	141.4 KiB
static.heraldcorp.com/js/climateclock_v2.js	10800.0 s	147.8 KiB
wimg.heraldcorp.com/svc/banner/202501/86455cbc-51ea-4bea-aa49-192b37ad2061.png	0.0 ms	84.8 KiB
wimg.heraldcorp.com/svc/banner/202509/59408691-e7a2-4df0-84fa-eb82c8ba0323.png	0.0 ms	79.8 KiB
/svc/desking/1003/series/202412/X20241210102601_248_20241...	0.0 ms	59.3 KiB
/svc/desking/1003/series/202412/X20241203141550_248_20241...	0.0 ms	56.3 KiB
wimg.heraldcorp.com/svc/banner/202412/2c01302f-080f-4c53-8e6e-1d9f360c9f08.jpg	0.0 ms	44.3 KiB
wimg.heraldcorp.com/svc/banner/202501/fa744dda-c6e5-45e6-ac08-262656eea23e.png	0.0 ms	30.5 KiB
static.heraldcorp.com/wbazic/kh/mobile/js/swiper-bundle.min.js	10800.0 s	43.6 KiB
t1.kakaocdn.net/kakao_js_sdk/v1/kakao.min.js	2455.0 s	34.5 KiB
www.google-analytics.com/analytics.js	7200.0 s	20.9 KiB
ssl.pstatic.net/melona/libs/gfp-nac-module/synchronizer.js	1967.0 s	18.2 KiB
static.heraldcorp.com/wbazic/kh/mobile/css/common.css?v=202603301436	10800.0 s	19.5 KiB
ssl.google-analytics.com/ga.js	7200.0 s	17.4 KiB
wcs.naver.net/wcslog.js	219.0 s	10.5 KiB
static.heraldcorp.com/js/lib/utils.js?v=202603301436	10800.0 s	11.6 KiB
static.heraldcorp.com/wbazic/kh/mobile/css/swiper-bundle.min.css	10800.0 s	5.3 KiB
static.heraldcorp.com/js/lib/utils.kh.hrd.js?v=202603301436	10800.0 s	4.7 KiB
static.heraldcorp.com/wbazic/kh/mobile/css/reset.css?v=202603301436	10800.0 s	3.5 KiB
static.heraldcorp.com/js/lib/sscad.js	10800.0 s	2.4 KiB
static.heraldcorp.com/js/lib/more.js	10800.0 s	2.3 KiB
static.heraldcorp.com/js/lib/ajax.js	10800.0 s	2.3 KiB
static.heraldcorp.com/js/lib/lazyimg.js	10800.0 s	2.2 KiB
open.spotify.com/embed/iframe-api/v1	0.0 ms	1.3 KiB
static.heraldcorp.com/wbazic/kh/mobile/css/climate.css	10800.0 s	1.5 KiB

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:24.704 source:map[column:4665 line:12 type:source-location url:https://static.heraldcorp.com/wbazic/kh/mobile/js/swiper-bundle.min.js urlProvider:network]] map[reflowTime:59.684 source:map[column:10379 line:12 type:source-location url:https://static.heraldcorp.com/wbazic/kh/mobile/js/swiper-bundle.min.js urlProvider:network]] map[reflowTime:0.513 source:map[column:16069 line:12 type:source-location url:https://static.heraldcorp.com/wbazic/kh/mobile/js/swiper-bundle.min.js urlProvider:network]] map[reflowTime:0.324 source:map[column:10859 line:12 type:source-location url:https://static.heraldcorp.com/wbazic/kh/mobile/js/swiper-bundle.min.js urlProvider:network]] map[reflowTime:0.05 source:map[column:16347 line:12 type:source-location url:https://static.heraldcorp.com/wbazic/kh/mobile/js/swiper-bundle.min.js urlProvider:network]] map[reflowTime:57.208 source:map[type:text value:[unattributed]]]]

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]

items: [map[duration:3510.664 label:Time to first byte subpart:timeToFirstByte] map[duration:549.429 label:Resource load delay subpart:resourceLoadDelay] map[duration:2809.893 label:Resource load duration subpart:resourceLoadDuration] map[duration:94.296 label:Element render delay subpart:elementRenderDelay]]

lhId: page-0-DIV

nodeLabel: body.body_column_4 > section.main > div.main_img_bg

path: 1,HTML,1,BODY,6,SECTION,0,DIV

selector: body.body_column_4 > section.main > div.main_img_bg

snippet: <div class="main_img_bg" style="background: url("https://wimg.heraldcorp.com/news/cms/2026/04/15/news-p.v1.…");">

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-DIV

nodeLabel: body.body_column_4 > section.main > div.main_img_bg

path: 1,HTML,1,BODY,6,SECTION,0,DIV

selector: body.body_column_4 > section.main > div.main_img_bg

snippet: <div class="main_img_bg" style="background: url("https://wimg.heraldcorp.com/news/cms/2026/04/15/news-p.v1.…");">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
static.heraldcorp.com/wbazic/kh/mobile/js/swiper-bundle.min.js	43.6 KiB	428 ms
static.heraldcorp.com/js/lib/utils.kh.hrd.js?v=202603301436	4.7 KiB
static.heraldcorp.com/js/lib/utils.js?v=202603301436	11.6 KiB	428 ms
static.heraldcorp.com/js/lib/ajax.js	2.3 KiB
static.heraldcorp.com/js/lib/more.js	2.3 KiB
static.heraldcorp.com/js/lib/sscad.js	2.4 KiB
static.heraldcorp.com/js/lib/lazyimg.js	2.2 KiB
static.heraldcorp.com/wbazic/kh/mobile/css/reset.css?v=202603301436	3.5 KiB	428 ms
static.heraldcorp.com/wbazic/kh/mobile/css/common.css?v=202603301436	19.5 KiB
static.heraldcorp.com/wbazic/kh/mobile/css/swiper-bundle.min.css	5.3 KiB	1.6 s
t1.kakaocdn.net/kakao_js_sdk/v1/kakao.min.js	34.5 KiB	780 ms
static.heraldcorp.com/wbazic/kh/mobile/css/climate.css	1.5 KiB
/css2?family=Frank+Ruhl+Libre:wght@300..900&family=Nanum+...	38.4 KiB	1.1 s
code.jquery.com/jquery-3.3.1.min.js	29.9 KiB	1.1 s

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/svc/desking/1003/LifenCulture/202604/A10717658_234_20260...	2.0 MiB	2.0 MiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-p.v1.20260415.a94609f028f448eea...	1.5 MiB	1.5 MiB
ul#swiper-wrapper-dd31196104bd210b2 > li.swiper-slide > a > img.watch_li_img `ul#swiper-wrapper-dd31196104bd210b2 > li.swiper-slide > a > img.watch_li_img`	/svc/desking/1003/index/202604/X20250829165731_226_202604...	1.3 MiB	1.3 MiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/rcv.YNA.20260415.PYH2026041507940001...	1.1 MiB	1.1 MiB
ul#swiper-wrapper-ae9078d2591ee507 > li.swiper-slide > a.section_graphic_swiper_img > img `ul#swiper-wrapper-ae9078d2591ee507 > li.swiper-slide > a.section_graphic_swiper_img > img`	/news/cms/2026/04/14/news-p.v1.20260414.a79f341968d3408cb...	1.3 MiB	1.0 MiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-p.v1.20260415.a8bc6d937bf24b03b...	972.4 KiB	967.1 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/rcv.YNA.20260415.PYH2026041509070001...	940.7 KiB	894.8 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/rcv.YNA.20260322.PYH2026032203500001...	885.5 KiB	880.1 KiB
ul#swiper-wrapper-ae04d3c69851e1014 > li.swiper-slide > a.today_photo > img.today_photo_img `ul#swiper-wrapper-ae04d3c69851e1014 > li.swiper-slide > a.today_photo > img.today_photo_img`	/news/cms/2026/04/14/rcv.YNA.20260414.PYH2026041406080005...	906.0 KiB	860.0 KiB
ul#swiper-wrapper-ae04d3c69851e1014 > li.swiper-slide > a.today_photo > img.today_photo_img `ul#swiper-wrapper-ae04d3c69851e1014 > li.swiper-slide > a.today_photo > img.today_photo_img`	/news/cms/2026/04/15/news-p.v1.20260415.e7309fb70c024e558...	789.2 KiB	743.3 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-p.v1.20260415.ac740ef38c3f44108...	748.7 KiB	736.6 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-p.v1.20260415.ba48d7e9060c4f23a...	647.8 KiB	642.5 KiB
ul > li > a > img `ul > li > a > img`	static.heraldcorp.com/wbazic/kh/mobile/image/kh_event_bnn_1600x900_260330.jpg	610.5 KiB	562.9 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-p.v1.20260415.cd41881b69324a588...	505.8 KiB	464.2 KiB
ul#swiper-wrapper-ae04d3c69851e1014 > li.swiper-slide > a.today_photo > img.today_photo_img `ul#swiper-wrapper-ae04d3c69851e1014 > li.swiper-slide > a.today_photo > img.today_photo_img`	/news/cms/2026/04/15/news-p.v1.20260415.ec8c55107e4f48579...	494.1 KiB	451.5 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/rcv.YNA.20260414.PAF2026041415700100...	485.4 KiB	439.5 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-p.v1.20260415.4dfd435e1f5d4bdf8...	474.2 KiB	419.3 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-p.v1.20260415.cdee5da7c837489fb...	392.6 KiB	387.3 KiB
ul#swiper-wrapper-ae9078d2591ee507 > li.swiper-slide > a.section_graphic_swiper_img > img `ul#swiper-wrapper-ae9078d2591ee507 > li.swiper-slide > a.section_graphic_swiper_img > img`	/news/cms/2026/04/15/news-p.v1.20260415.ec6b5e90d600402aa...	319.0 KiB	191.4 KiB
ul#swiper-wrapper-ae9078d2591ee507 > li.swiper-slide > a.section_graphic_swiper_img > img `ul#swiper-wrapper-ae9078d2591ee507 > li.swiper-slide > a.section_graphic_swiper_img > img`	/news/cms/2026/04/13/news-p.v1.20260413.f89604c15d7e4fd9b...	310.1 KiB	183.0 KiB
ul#swiper-wrapper-ae04d3c69851e1014 > li.swiper-slide > a.today_photo > img.today_photo_img `ul#swiper-wrapper-ae04d3c69851e1014 > li.swiper-slide > a.today_photo > img.today_photo_img`	/news/cms/2026/04/14/news-p.v1.20260414.77451bf6eb434edeb...	297.2 KiB	179.8 KiB
ul#swiper-wrapper-dd31196104bd210b2 > li.swiper-slide > a > img.watch_li_img `ul#swiper-wrapper-dd31196104bd210b2 > li.swiper-slide > a > img.watch_li_img`	/svc/desking/1003/index/202604/X20250829165707_226_202604...	192.8 KiB	178.2 KiB
ul#swiper-wrapper-dd31196104bd210b2 > li.swiper-slide > a > img.watch_li_img `ul#swiper-wrapper-dd31196104bd210b2 > li.swiper-slide > a > img.watch_li_img`	/svc/desking/1003/index/202604/X20250905100912_226_202604...	174.9 KiB	157.9 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-a.v1.20260414.67fda352b34148e59...	151.8 KiB	135.6 KiB
Box office hit ‘Salmokji’ turns spooky reservoir into daredevil draw `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-p.v1.20260415.d4e4e30f9554428a8...	127.1 KiB	121.9 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-a.v1.20260415.fc4d257c631d4d7a8...	140.9 KiB	113.3 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/13/news-p.v1.20260413.c8f0eac0c87b48278...	107.8 KiB	102.6 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-a.v1.20260415.e3c38970200d4d5c9...	93.1 KiB	86.2 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/svc/desking/1003/Kpop/202604/A10717586_238_2026041513121...	79.2 KiB	73.0 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-a.v1.20260415.1ec796c0d72444409...	70.9 KiB	65.5 KiB
Chasing luck? Try mountains or a luxury hotel `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/14/news-p.v1.20260414.cbd8a6bbeace47f0a...	48.5 KiB	43.4 KiB
IAEA chief says Iran enrichment freeze a ‘political decision,' stresses verific… `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-p.v1.20260415.0de13e7cdfdc4bf19...	28.2 KiB	22.2 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/14/news-p.v1.20260414.9f625344d23a43c68...	27.1 KiB	21.4 KiB
모바일 메인_구독 `ul > li > a > img#hbanner_74_180`	wimg.heraldcorp.com/svc/banner/202501/fa744dda-c6e5-45e6-ac08-262656eea23e.png	30.1 KiB	19.2 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/14/news-p.v1.20260409.2b8e28ef9edd4d848...	24.2 KiB	18.9 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/14/news-p.v1.20260414.e5e779a1ebb94a639...	18.7 KiB	15.5 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/14/news-p.v1.20260413.05f15fcc2ed74c00b...	16.8 KiB	11.6 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-a.v1.20260414.8c532a7bff224fe5b...	16.8 KiB	11.6 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-p.v1.20260415.eedd7a79057e473e8...	16.9 KiB	11.6 KiB
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`	/news/cms/2026/04/15/news-p.v1.20260415.e272dd5789104f59a...	27.6 KiB	11.4 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 3.1 s

URL	Time Spent
koreaherald.com/	1.6 s
www.koreaherald.com/	1.6 s
m.koreaherald.com/	0.0 ms

Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 785 ms

URL	Time Spent
m.koreaherald.com/	885 ms

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 430 ms 6.1 KiB

URL	Transfer Size	Est Savings
/css2?family=Frank+Ruhl+Libre:wght@300..900&family=Nanum+...	38.4 KiB	3.9 KiB
static.heraldcorp.com/wbazic/kh/mobile/css/common.css?v=202603301436	19.5 KiB	2.2 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 90 ms 3.9 KiB

URL	Transfer Size	Est Savings
static.heraldcorp.com/js/lib/utils.js?v=202603301436	11.2 KiB	3.9 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 430 ms 68.5 KiB

URL	Transfer Size	Est Savings
/css2?family=Frank+Ruhl+Libre:wght@300..900&family=Nanum+...	37.9 KiB	37.9 KiB
static.heraldcorp.com/wbazic/kh/mobile/css/common.css?v=202603301436	19.2 KiB	16.8 KiB
/! CleanSlate * github.com/premasagar/cleanslate * */.cleanslate,.cleanslate a,.cleanslate abbr…	16.0 KiB	13.8 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 810 ms 496.6 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-QCMCW365BY&cx=c&gtm=4e64e1	157.6 KiB	109.3 KiB
www.googletagmanager.com/gtag/js?id=G-NSBNRNT4DP&cx=c&gtm=4e64e1	153.7 KiB	107.1 KiB
www.googletagmanager.com/gtag/js?id=G-NSBNRNT4DP	153.7 KiB	63.1 KiB
www.googletagmanager.com/gtag/js?id=G-QCMCW365BY	157.6 KiB	63.1 KiB
www.googletagmanager.com/gtag/js?id=UA-127230343-2	116.3 KiB	62.9 KiB
static.heraldcorp.com/js/climateclock_v2.js	147.4 KiB	44.6 KiB
static.heraldcorp.com/wbazic/kh/mobile/js/swiper-bundle.min.js	43.3 KiB	23.4 KiB
developers.kakao.com/sdk/js/kakao.min.js	34.1 KiB	23.1 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
static.heraldcorp.com/wbazic/kh/mobile/js/swiper-bundle.min.js	3.4 s	381 ms	13 ms
m.koreaherald.com/	1.4 s	206 ms	21 ms
Unattributable	988 ms	7.1 ms	0.0 ms
static.heraldcorp.com/js/climateclock_v2.js	303 ms	268 ms	29 ms
www.googletagmanager.com/gtag/js?id=G-QCMCW365BY	237 ms	191 ms	44 ms
www.googletagmanager.com/gtag/js?id=G-NSBNRNT4DP	219 ms	185 ms	33 ms
www.googletagmanager.com/gtag/js?id=UA-127230343-2	141 ms	103 ms	37 ms
embed-cdn.spotifycdn.com/_next/static/iframe_api.f8de525e2d635f3dc09d.js	105 ms	87 ms	17 ms
code.jquery.com/jquery-3.3.1.min.js	81 ms	62 ms	6.8 ms
www.googletagmanager.com/gtag/js?id=G-QCMCW365BY&cx=c&gtm=4e64e1	61 ms	24 ms	37 ms
www.googletagmanager.com/gtag/js?id=G-NSBNRNT4DP&cx=c&gtm=4e64e1	60 ms	25 ms	36 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Other	3.0 s
Script Evaluation	1.7 s
Style & Layout	1.1 s
Rendering	912 ms
Script Parsing & Compilation	303 ms
Parse HTML & CSS	72 ms
Garbage Collection	54 ms

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
/svc/desking/1003/LifenCulture/202604/A10717658_234_20260...	2.0 MiB
/news/cms/2026/04/15/news-p.v1.20260415.a94609f028f448eea...	1.5 MiB
/svc/desking/1003/index/202604/X20250829165731_226_202604...	1.3 MiB
/news/cms/2026/04/14/news-p.v1.20260414.a79f341968d3408cb...	1.3 MiB
/news/cms/2026/04/15/rcv.YNA.20260415.PYH2026041507940001...	1.1 MiB
/news/cms/2026/04/15/news-p.v1.20260415.a8bc6d937bf24b03b...	973.8 KiB
/news/cms/2026/04/15/rcv.YNA.20260415.PYH2026041509070001...	942.1 KiB
/news/cms/2026/04/14/rcv.YNA.20260414.PYH2026041406080005...	907.4 KiB
/news/cms/2026/04/15/rcv.YNA.20260322.PYH2026032203500001...	886.8 KiB
wimg.heraldcorp.com/svc/desking/1003/series/202601/null_248_20260114162616.png	848.2 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
ul > li > a > img `ul > li > a > img`	static.heraldcorp.com/wbazic/kh/mobile/image/kh_event_bnn_1600x900_260330.jpg
모바일 메인_구독 `ul > li > a > img#hbanner_74_180`	wimg.heraldcorp.com/svc/banner/202501/fa744dda-c6e5-45e6-ac08-262656eea23e.png
englishcafe_m `ul > li > a > img#hbanner_145_598`	wimg.heraldcorp.com/svc/banner/202509/59408691-e7a2-4df0-84fa-eb82c8ba0323.png
모바일_레시피 `ul > li > a > img#hbanner_121_196`	wimg.heraldcorp.com/svc/banner/202501/86455cbc-51ea-4bea-aa49-192b37ad2061.png
모바일 메인 배너1 `ul > li > a > img#hbanner_72_108`	wimg.heraldcorp.com/svc/banner/202412/2c01302f-080f-4c53-8e6e-1d9f360c9f08.jpg

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits

●Optimize DOM size

●Font display

●Modern HTTP

●Optimize viewport for mobile

●User Timing marks and measures 12 user timings

●Avoid long main-thread tasks 13 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 290 ms

●Server Backend Latencies 1,160 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

○INP breakdown

○Avoid non-composited animations

○Avoid large layout shifts

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body.body_column_4 > header > div#header_gnb_basic > button.header_menu `body.body_column_4 > header > div#header_gnb_basic > button.header_menu`

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
ul > li > a > img `ul > li > a > img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`

Form elements without effective labels can create frustrating experiences for screen reader users. Learn more about the `select` element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Our site The Herald Business Herald Muse Real Foods Herald Eco Herald Design Th… `body.body_column_4 > footer > div.footer_family > select`

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body.body_column_4 > section.podcast > div.factor > iframe `body.body_column_4 > section.podcast > div.factor > iframe`
body.body_column_4 > section.podcast > iframe `body.body_column_4 > section.podcast > iframe`

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body.body_column_4 > header > div#header_gnb_basic > a.header_logo `body.body_column_4 > header > div#header_gnb_basic > a.header_logo`
body.body_column_4 > header > div#header_gnb_basic > a#mypage_icon `body.body_column_4 > header > div#header_gnb_basic > a#mypage_icon`
div > ul > li > a `div > ul > li > a`
div.swiper > ul#swiper-wrapper-ae9078d2591ee507 > li.swiper-slide > a.section_graphic_swiper_img `div.swiper > ul#swiper-wrapper-ae9078d2591ee507 > li.swiper-slide > a.section_graphic_swiper_img`
div.swiper > ul#swiper-wrapper-ae9078d2591ee507 > li.swiper-slide > a.section_graphic_swiper_img `div.swiper > ul#swiper-wrapper-ae9078d2591ee507 > li.swiper-slide > a.section_graphic_swiper_img`
div.swiper > ul#swiper-wrapper-ae9078d2591ee507 > li.swiper-slide > a.section_graphic_swiper_img `div.swiper > ul#swiper-wrapper-ae9078d2591ee507 > li.swiper-slide > a.section_graphic_swiper_img`
div.swiper > ul#swiper-wrapper-dd31196104bd210b2 > li.swiper-slide > a `div.swiper > ul#swiper-wrapper-dd31196104bd210b2 > li.swiper-slide > a`
div.swiper > ul#swiper-wrapper-dd31196104bd210b2 > li.swiper-slide > a `div.swiper > ul#swiper-wrapper-dd31196104bd210b2 > li.swiper-slide > a`
div.swiper > ul#swiper-wrapper-dd31196104bd210b2 > li.swiper-slide > a `div.swiper > ul#swiper-wrapper-dd31196104bd210b2 > li.swiper-slide > a`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
The International Atomic Energy Agency chief said Wednesday that any agreement … `ul.column_li > li > a.column > div.column_txt_sub`
A deserted reservoir in Yesan, South Chungcheong Province, is emerging as an un… `ul.column_li > li > a.column > div.column_txt_sub`
If you spot someone taking a photo on a mountaintop or lingering over coffee at… `ul.column_li > li > a.column > div.column_txt_sub`
more `section > div.column_title > a.column_title_more > p`
Chinese brokers have been selling purported Test of Proficiency in Korean quest… `li > a.column > div.column_t_bg > div.column_txt_sub`
more `section.section_graphic > div.column_title > a.column_title_more > p`
more `section.opinion > div.column_title > a.column_title_more > p`
Korea Herald `li.noimg > a.column > div.column_t_bg > div.column_cate`
Korea Herald `li.noimg > a.column > div.column_t_bg > div.column_cate`
Korea Herald `li.noimg > a.column > div.column_t_bg > div.column_cate`
more `section > div.column_title > a.column_title_more > p`
more `section > div.column_title > a.column_title_more > p`
more `section > div.column_title > a.column_title_more > p`
more `section > div.column_title > a.column_title_more > p`
more `section.podcast > div.column_title > a.column_title_more > p`
more `section.watch > div.column_title > a.column_title_more > p`
more `section > div.column_title > a.column_title_more > p`
Life&Culture `li > a.column > div.column_t_bg > div.column_cate`
National `li > a.column > div.column_t_bg > div.column_cate`
Life&Culture `li > a.column > div.column_t_bg > div.column_cate`
more `section > div.column_title > a.column_title_more > p`
경제·금융 `li > a.column > div.column_t_bg > div.column_cate`
증권 `li > a.column > div.column_t_bg > div.column_cate`
국제 `li > a.column > div.column_t_bg > div.column_cate`
more `section.notice > div.column_title > a.column_title_more > p`
About korea herald `footer > ul.footer_li > li > a`
Contact Us `footer > ul.footer_li > li > a`
Location `footer > ul.footer_li > li > a`
User Agreement `footer > ul.footer_li > li > a`
Privacy Statement `ul.footer_li > li > a > b`
Youth Protection Policy `footer > ul.footer_li > li > a`
The Korea Herald by Herald Corporation Copyright Herald Corporation. All Rights… `body.body_column_4 > footer > p.footer_copy`
The Korea Herald by Herald Corporation `body.body_column_4 > footer > p.footer_copy > b`

These are opportunities to improve the legibility of your content.

Tables and lists

Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Seoul City offers rabies vaccinations for pets for 10,000 won T-shirt weather: … `body.body_column_4 > section > div.swiper > ul#swiper-wrapper-ae04d3c69851e1014`
1 US YouTuber Johnny Somali gets jail time in Korea over deepfake, public stun… `body.body_column_4 > section.section_rank > div.swiper > ul#swiper-wrapper-5f572b3fb0e91c88`
1 / 3 `body.body_column_4 > section.section_graphic > div.swiper > ul#swiper-wrapper-ae9078d2591ee507`
KOSDAQ 1,152 30.55 USD/KRW 1,481.4 EUR/KRW 1,747.46 CNH/KRW 217.55 JPY(100)/… `div.factor > a.stock_data > div.swiper > ul#swiper-wrapper-9ca627b03e463ab1`
1 / 3 `body.body_column_4 > section.watch > div.swiper > ul#swiper-wrapper-dd31196104bd210b2`
Celeb Reads K-pop 101 100 Food Challenge K-parenting 101 `body.body_column_4 > section.magazine > div.swiper > ul#swiper-wrapper-105dd246a10c54e8c`

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Best practices

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
head > meta `head > meta`

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html `html`

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●`button`, `link`, and `menuitem` elements have accessible names

●ARIA attributes are used as specified for the element's role

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●Touch targets have sufficient size and spacing.

●Deprecated ARIA roles were not used

●The page contains a heading, skip link, or landmark region

●Uses ARIA roles only on compatible elements

●Identical links have the same purpose.

○`[accesskey]` values are unique

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○`[aria-hidden="true"]` elements do not contain focusable descendents

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○Heading elements appear in a sequentially-descending order

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○Form elements have associated labels

○Links are distinguishable without relying on color.

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
m.koreaherald.com/Photo	more
m.koreaherald.com/series/338	more
m.koreaherald.com/Opinion	more
m.koreaherald.com/National	more
m.koreaherald.com/Business	more
m.koreaherald.com/LifenCulture	more
m.koreaherald.com/Kpop	more
m.koreaherald.com/Podcast	more
www.youtube.com/@thekoreaherald	more
m.koreaherald.com/series	more
mbiz.heraldcorp.com/	more
m.koreaherald.com/notice	more

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
ul > li > a > img `ul > li > a > img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`
li > a.column > div.column_img_bg > img.column_img `li > a.column > div.column_img_bg > img.column_img`

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links are crawlable

●robots.txt is valid

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`