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Lighthouse Mobile

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

Audit breakdown by category with detailed findings.

54

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.

RequestCache TTLTransfer Size
/webdata/boardimages/konews/89bzee0z6faz094za88ze30z7e6z6...604800.0 s623.3 KiB
snu.ac.kr/webdata/kor/instanews/fccz595zc59zc4az988ze6bz1fdzf8fz64ez485zcf.png604800.0 s490.4 KiB
/webdata/boardimages/konews/9d2z6a7zaf9z00bzfd6z945z410z9...604800.0 s481.4 KiB
snu.ac.kr/_skin/kor/layout/font/noto-serif-kr-v6-latin_korean-regular.woff2604800.0 s478.9 KiB
/webdata/boardimages/konews/4fcz6a6zdddz683zb40z8aeza34z7...604800.0 s476.4 KiB
/webdata/boardimages/konews/c94z5d8z835zddez31bz6e4z055zd...604800.0 s469.4 KiB
snu.ac.kr/webdata/kor/instanews/f5bz07dzec1z95az0dfzae1zc47z43az372z180zec.png604800.0 s468.2 KiB
snu.ac.kr/webdata/kor/instanews/2ddzd68z767z535zce8z320z5a4z1a6z46fzde5z6b.png604800.0 s466.1 KiB
snu.ac.kr/_skin/kor/layout/css/base.css?ver=2026-02-24604800.0 s457.9 KiB
snu.ac.kr/js/jquery-ui-1.10.js604800.0 s425.1 KiB
/webdata/boardimages/konews/6a7z4d6zc6ez103zaf0zbd9zb38z9...604800.0 s423.7 KiB
snu.ac.kr/webdata/kor/instanews/c5bze68z98ez3fez481zc8ez6f9z296zc1ez8f0zcf.png604800.0 s422.5 KiB
/webdata/boardimages/konews/1b6zb2bzab0ze8bz909zedbz21fze...604800.0 s367.8 KiB
snu.ac.kr/webdata/kor/instanews/2c0z832zf5fz184ze68z9c6zc28zdffz4c1z485z17.png604800.0 s350.6 KiB
snu.ac.kr/webdata/kor/instanews/6faz210zd02z51fza6bzccbz968zb42z3ffz440z99.png604800.0 s315.2 KiB
/webdata/boardimages/kohighlight/825zaf1ze52z6d4zb1azd79z...604800.0 s258.9 KiB
snu.ac.kr/webdata/kor/instanews/ff3zec8zf37zeecz847zdbbz01ez048z2d4za5bzdf.png604800.0 s255.1 KiB
snu.ac.kr/webdata/kor/instanews/1d0z29dz08az482z07fzfa5zb01zce0z63cz138z5d.png604800.0 s252.2 KiB
snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-700.woff2604800.0 s217.9 KiB
/webdata/boardimages/kohighlight/270ze0eza07zb6az3a4z0abz...604800.0 s217.6 KiB
snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-500.woff2604800.0 s212.1 KiB
/webdata/boardimages/konews/adfza67zaaez74cz61ezd06zc45zd...604800.0 s211.9 KiB
snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-regular.woff2604800.0 s209.7 KiB
/webdata/boardimages/kohighlight/fc9zd8dze5czcb6ze4fz312z...604800.0 s200.4 KiB
snu.ac.kr/webdata/kor/instanews/89bzb4fzeacz13azfc7z4f9z9d9z8ebz1f6z313zd0.png604800.0 s200.1 KiB
/webdata/boardimages/kohighlight/3c2z3dfzfbaz357zd64z17dz...604800.0 s189.5 KiB
snu.ac.kr/webdata/uploads/kor/image/2025/04/main_banner_20250429_web.jpg604800.0 s165.6 KiB
ssl.pstatic.net/melona/libs/gfp-nac-module/synchronizer.js1361.0 s18.2 KiB
snu.ac.kr/webdata/kor/instanews/000z6e6ze1dzd19z3abz09bz00ezd19zcafz104z0e.png604800.0 s108.9 KiB
wcs.naver.net/wcslog.js130.0 s10.5 KiB
snu.ac.kr/js/jquery.js604800.0 s88.0 KiB
/webdata/boardimages/konews/4fbzb94z420zedfz0a7zefcz282z9...604800.0 s61.2 KiB
/webdata/boardimages/koevent/44ez3eaz175z6bfzafcz79dz596z...604800.0 s46.4 KiB
snu.ac.kr/js/slick.min.js?ver=2026-02-24604800.0 s44.4 KiB
snu.ac.kr/webdata/uploads/kor/image/2025/04/main_banner_20250429_mobile.jpg604800.0 s39.6 KiB
/webdata/boardimages/koevent/9b9z9b0z59fz60dz687z8b6z38cz...604800.0 s38.9 KiB
/webdata/boardimages/koevent/066z86az2c0z82dz480z5eczaf2z...604800.0 s37.0 KiB
snu.ac.kr/webdata/uploads/kor/image/2020/03/index-topbanner-text_sm.png604800.0 s33.6 KiB
/webdata/boardimages/koevent/8e4ze5cz3e0zca0za34zc91z050z...604800.0 s30.0 KiB
snu.ac.kr/webdata/uploads/kor/image/2021/04/if_designaward2021_red_l_rgb.png604800.0 s24.9 KiB
snu.ac.kr/webdata/uploads/kor/image/2019/12/index-topbanner-symbol_sm.png604800.0 s23.7 KiB
snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-500.woff2604800.0 s17.7 KiB
snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-700.woff2604800.0 s17.6 KiB
snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-regular.woff2604800.0 s17.5 KiB
snu.ac.kr/_skin/kor/layout/js/webfont.js604800.0 s15.6 KiB
snu.ac.kr/_skin/kor/layout/css/oldboard.css?ver=2026-02-24604800.0 s15.5 KiB
snu.ac.kr/webdata/uploads/kor/image/2020/03/index-topbanner-text_lg.png604800.0 s14.7 KiB
snu.ac.kr/_skin/kor/layout/css/font.css604800.0 s13.8 KiB
snu.ac.kr/_skin/kor/layout/image/footer-wa_sm.png604800.0 s12.3 KiB
snu.ac.kr/webdata/uploads/kor/image/2019/12/index-topbanner-symbol_lg.png604800.0 s11.5 KiB
snu.ac.kr/_skin/kor/layout/image/footer-snunow_lg.png604800.0 s9.8 KiB
snu.ac.kr/_skin/kor/layout/image/footer-snunow_sm.png604800.0 s8.3 KiB
snu.ac.kr/_skin/kor/layout/image/snu-logo_sm.png604800.0 s7.1 KiB
snu.ac.kr/_skin/kor/layout/image/footer-wa_lg.png604800.0 s6.9 KiB
snu.ac.kr/webdata/uploads/kor/image/2019/12/index-board01-title_sm.png604800.0 s6.6 KiB
snu.ac.kr/webdata/uploads/kor/image/2019/12/index-board02-title_sm.png604800.0 s6.4 KiB
snu.ac.kr/js/zenda-site.js?ver=2026-02-24604800.0 s6.4 KiB
snu.ac.kr/_skin/kor/layout/image/footer-facebook_lg.png604800.0 s6.2 KiB
snu.ac.kr/_skin/kor/layout/image/footer-snubird_sm.png604800.0 s6.1 KiB
snu.ac.kr/_skin/kor/layout/image/icon-sns-insta-32.png604800.0 s5.9 KiB
snu.ac.kr/_skin/kor/layout/image/footer-instagram_sm.png604800.0 s5.6 KiB
snu.ac.kr/webdata/uploads/kor/image/2019/12/index-board01-title_lg.png604800.0 s5.4 KiB
snu.ac.kr/webdata/uploads/kor/image/2019/12/index-board02-title_lg.png604800.0 s5.3 KiB
snu.ac.kr/_skin/kor/layout/image/footer-facebook_sm.png604800.0 s5.2 KiB
snu.ac.kr/_skin/kor/layout/image/footer-snubird_lg.png604800.0 s5.0 KiB
snu.ac.kr/_skin/kor/layout/image/footer-youtube_sm.png604800.0 s4.9 KiB
snu.ac.kr/webdata/uploads/kor/image/2020/02/index-visual-controller.png604800.0 s4.8 KiB
snu.ac.kr/_skin/kor/layout/js/responsive.js?ver=2026-02-24604800.0 s4.7 KiB
snu.ac.kr/_skin/kor/layout/image/footer-instagram_lg.png604800.0 s4.5 KiB
snu.ac.kr/_skin/kor/layout/image/footer-youtube_lg.png604800.0 s4.2 KiB
snu.ac.kr/_skin/kor/layout/js/gnb.js?ver=2026-02-24604800.0 s4.1 KiB
snu.ac.kr/_skin/kor/layout/image/header-visitgnb-btn_sm.png604800.0 s4.0 KiB
snu.ac.kr/_skin/kor/layout/image/icon-videos-arrow_lg.png604800.0 s4.0 KiB
snu.ac.kr/_skin/kor/layout/image/header-subgnb-search_sm.png604800.0 s3.9 KiB
snu.ac.kr/webdata/uploads/kor/image/2020/02/index-slider-play_sm.png604800.0 s3.8 KiB
snu.ac.kr/_skin/kor/layout/image/header-subgnb-search_lg.png604800.0 s3.8 KiB
snu.ac.kr/_skin/kor/layout/image/header-gnb-d2-close_sm.png604800.0 s3.7 KiB
snu.ac.kr/_skin/kor/layout/image/icon-more-arrow-right_sm.png604800.0 s3.6 KiB
snu.ac.kr/_skin/kor/layout/image/guide-select-icon_sm.png604800.0 s3.6 KiB
snu.ac.kr/_skin/kor/layout/image/icon-newwindow_lg.png604800.0 s3.6 KiB
snu.ac.kr/webdata/uploads/kor/image/2020/02/index-slider-stop_sm.png604800.0 s3.5 KiB
snu.ac.kr/js/jquery-migrate-3.0.0.min.js604800.0 s2.5 KiB

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLEst Savings
snu.ac.kr/_skin/kor/layout/font/noto-serif-kr-v6-latin_korean-regular.woff22.6 s
snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-regular.woff22.5 s
snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-500.woff21.9 s
snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-700.woff21.0 s
snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-500.woff2310 ms
snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-700.woff2305 ms
snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-regular.woff2300 ms

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.

URLResource SizeEst Savings
[샤로잡다 시즌2] 나노기술로 질병도 정복할 수 있을까? div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/89bzee0z6faz094za88ze30z7e6z6...621.0 KiB562.4 KiB
yellow yellow yellow li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/fccz595zc59zc4az988ze6bz1fdzf8fz64ez485zcf.png488.1 KiB447.4 KiB
눈부신 봄날의 캠퍼스 li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/f5bz07dzec1z95az0dfzae1zc47z43az372z180zec.png465.9 KiB425.2 KiB
제66주년 4·19혁명 희생자 추모 li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/2ddzd68z767z535zce8z320z5a4z1a6z46fzde5z6b.png463.7 KiB423.0 KiB
[샤로잡다 시즌2] 극락도 락이다, 힙불교 제대로 알아보기 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/9d2z6a7zaf9z00bzfd6z945z410z9...479.0 KiB420.5 KiB
‘도서관 속 작은 펼침, 세상을 여는 큰 열림’, 2026 도서관의 날 도서관 주간 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/4fcz6a6zdddz683zb40z8aeza34z7...474.1 KiB415.5 KiB
경계 없는 지식의 확산, 서울대학교 공식 유튜브 20만 구독자 돌파 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/c94z5d8z835zddez31bz6e4z055zd...467.1 KiB408.5 KiB
서울대생을 위한 벚꽃 맛 스티커 li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/c5bze68z98ez3fez481zc8ez6f9z296zc1ez8f0zcf.png420.2 KiB379.5 KiB
여자핸드볼부, 제81회 전국종별핸드볼선수권대회 전승 우승 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/6a7z4d6zc6ez103zaf0zbd9zb38z9...421.4 KiB362.8 KiB
중간고사 A+ 맞는 주파수 li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/2c0z832zf5fz184ze68z9c6zc28zdffz4c1z485z17.png348.3 KiB307.6 KiB
AI 네이티브 캠퍼스로의 도약, 서울대학교 AI Summit 2026 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/1b6zb2bzab0ze8bz909zedbz21fze...365.4 KiB306.8 KiB
Full Blossom at SNU li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/6faz210zd02z51fza6bzccbz968zb42z3ffz440z99.png312.8 KiB272.2 KiB
고유전체로 밝힌 삼국시대 지역 사회에서의 친족 네트워크와 족내혼 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/kohighlight/825zaf1ze52z6d4zb1azd79z...256.6 KiB234.7 KiB
26학번 새내기 앙케이트 li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/ff3zec8zf37zeecz847zdbbz01ez048z2d4za5bzdf.png252.8 KiB212.1 KiB
Flower Walk at SNU li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/1d0z29dz08az482z07fzfa5zb01zce0z63cz138z5d.png249.9 KiB209.2 KiB
고형암 치료의 난제 ‘항원탈락’을 극복하는 차세대 CAR-NK 플랫폼 개발 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/kohighlight/270ze0eza07zb6az3a4z0abz...215.2 KiB193.3 KiB
새로 제2형 당뇨병을 진단받은 남성 흡연자, 금연 후 ‘체중 유지’가 골절 위험 낮춘다 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/kohighlight/fc9zd8dze5czcb6ze4fz312z...198.1 KiB176.1 KiB
“몸 안 좋을 때 술 마시면 왜 더 위험할까?”  염증 상황에서의 알코올성 간 손상 기전 규명 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/kohighlight/3c2z3dfzfbaz357zd64z17dz...187.1 KiB165.2 KiB
교수님! 출연해주세요! li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/89bzb4fzeacz13azfc7z4f9z9d9z8ebz1f6z313zd0.png197.8 KiB157.1 KiB
장애인과 함께 살아가는 세상을 위해, 공익법률센터 세미나 ‘공공정책의 수단으로서의 장애인권리협약’ div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/adfza67zaaez74cz61ezd06zc45zd...209.5 KiB150.9 KiB
샤대타로 li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/000z6e6ze1dzd19z3abz09bz00ezd19zcafz104z0e.png106.6 KiB65.9 KiB
[Asia and the World]Youth, Creativity, and Cultural Power(4/23) ([아시아와 세계] 청년, … div.ly-inner > div.board-index-img2 > a.item > span.thumb
/webdata/boardimages/koevent/066z86az2c0z82dz480z5eczaf2z...34.7 KiB24.9 KiB
샤인기부, 당신이 만드는 빛나는 변화, 샤인 굿즈 받기 div#skip-content > div.ly-container > a.inner > img.only-mobile
snu.ac.kr/webdata/uploads/kor/image/2025/04/main_banner_20250429_mobile.jpg37.3 KiB24.6 KiB

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:986.904 label:Time to first byte subpart:timeToFirstByte] map[duration:4443.605 label:Resource load delay subpart:resourceLoadDelay] map[duration:0 label:Resource load duration subpart:resourceLoadDuration] map[duration:9756.695 label:Element render delay subpart:elementRenderDelay]]
lhId: page-23-VIDEO
nodeLabel: div.slide > div.slide-bg > div.bg > video#banner-video00
path: 1,HTML,1,BODY,8,MAIN,1,DIV,4,SECTION,5,DIV,1,DIV,3,DIV,1,DIV,1,VIDEO
selector: div.slide > div.slide-bg > div.bg > video#banner-video00
snippet: <video id="banner-video00" playsinline="" muted="" autoplay="" loop="">

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-23-VIDEO
nodeLabel: div.slide > div.slide-bg > div.bg > video#banner-video00
path: 1,HTML,1,BODY,8,MAIN,1,DIV,4,SECTION,5,DIV,1,DIV,3,DIV,1,DIV,1,VIDEO
selector: div.slide > div.slide-bg > div.bg > video#banner-video00
snippet: <video id="banner-video00" playsinline="" muted="" autoplay="" loop="">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
snu.ac.kr/http/1.1
snu.ac.kr/_skin/kor/layout/js/webfont.jshttp/1.1
snu.ac.kr/js/jquery.jshttp/1.1
snu.ac.kr/js/jquery-migrate-3.0.0.min.jshttp/1.1
snu.ac.kr/js/jquery-ui-1.10.jshttp/1.1
snu.ac.kr/js/slick.min.js?ver=2026-02-24http/1.1
snu.ac.kr/js/zenda-site.js?ver=2026-02-24http/1.1
snu.ac.kr/_skin/kor/layout/css/base.css?ver=2026-02-24http/1.1
snu.ac.kr/_skin/kor/layout/css/oldboard.css?ver=2026-02-24http/1.1
snu.ac.kr/_skin/kor/layout/js/gnb.js?ver=2026-02-24http/1.1
snu.ac.kr/_skin/kor/layout/js/responsive.js?ver=2026-02-24http/1.1
snu.ac.kr/_skin/kor/layout/image/header-subgnb-search_lg.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/css/font.csshttp/1.1
snu.ac.kr/_skin/kor/layout/image/header-subgnb-search_sm.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/header-gnb-d2-close_sm.pnghttp/1.1
snu.ac.kr/webdata/uploads/kor/image/2019/12/index-topbanner-symbol_sm.pnghttp/1.1
snu.ac.kr/webdata/uploads/kor/image/2019/12/index-topbanner-symbol_lg.pnghttp/1.1
snu.ac.kr/webdata/uploads/kor/image/2020/03/index-topbanner-text_lg.pnghttp/1.1
snu.ac.kr/webdata/uploads/kor/image/2020/03/index-topbanner-text_sm.pnghttp/1.1
snu.ac.kr/webdata/uploads/kor/image/2020/02/index-slider-stop_sm.pnghttp/1.1
snu.ac.kr/webdata/uploads/kor/image/2020/02/index-slider-play_sm.pnghttp/1.1
snu.ac.kr/webdata/uploads/kor/media/2026/02/80emblem_main.svghttp/1.1
snu.ac.kr/webdata/uploads/kor/image/2019/12/index-board01-title_sm.pnghttp/1.1
snu.ac.kr/webdata/uploads/kor/image/2019/12/index-board01-title_lg.pnghttp/1.1
/webdata/boardimages/konews/4fcz6a6zdddz683zb40z8aeza34z7...http/1.1
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/webdata/boardimages/kohighlight/270ze0eza07zb6az3a4z0abz...http/1.1
/webdata/boardimages/konews/1b6zb2bzab0ze8bz909zedbz21fze...http/1.1
/webdata/boardimages/konews/89bzee0z6faz094za88ze30z7e6z6...http/1.1
snu.ac.kr/webdata/kor/instanews/c5bze68z98ez3fez481zc8ez6f9z296zc1ez8f0zcf.pnghttp/1.1
snu.ac.kr/webdata/kor/instanews/fccz595zc59zc4az988ze6bz1fdzf8fz64ez485zcf.pnghttp/1.1
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snu.ac.kr/webdata/kor/instanews/89bzb4fzeacz13azfc7z4f9z9d9z8ebz1f6z313zd0.pnghttp/1.1
snu.ac.kr/webdata/kor/instanews/000z6e6ze1dzd19z3abz09bz00ezd19zcafz104z0e.pnghttp/1.1
snu.ac.kr/webdata/uploads/kor/image/2025/04/main_banner_20250429_mobile.jpghttp/1.1
snu.ac.kr/webdata/uploads/kor/image/2025/04/main_banner_20250429_web.jpghttp/1.1
snu.ac.kr/webdata/uploads/kor/image/2019/12/index-board02-title_sm.pnghttp/1.1
snu.ac.kr/webdata/uploads/kor/image/2019/12/index-board02-title_lg.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-regular.woff2http/1.1
snu.ac.kr/_skin/kor/layout/font/noto-serif-kr-v6-latin_korean-regular.woff2http/1.1
snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-regular.woff2http/1.1
snu.ac.kr/_skin/kor/layout/image/footer-snunow_lg.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/footer-snunow_sm.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/footer-snubird_lg.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/footer-snubird_sm.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/footer-facebook_lg.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/footer-facebook_sm.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/footer-youtube_lg.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/footer-youtube_sm.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/footer-instagram_lg.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/footer-instagram_sm.pnghttp/1.1
snu.ac.kr/webdata/uploads/kor/image/2021/04/if_designaward2021_red_l_rgb.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/footer-wa_lg.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/footer-wa_sm.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/snu-logo_sm.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/header-visitgnb-btn_sm.pnghttp/1.1
snu.ac.kr/webdata/uploads/kor/image/2020/02/index-visual-controller.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/icon-newwindow_lg.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/icon-sns-insta-32.pnghttp/1.1
/webdata/boardimages/koevent/066z86az2c0z82dz480z5eczaf2z...http/1.1
/webdata/boardimages/koevent/9b9z9b0z59fz60dz687z8b6z38cz...http/1.1
/webdata/boardimages/koevent/8e4ze5cz3e0zca0za34zc91z050z...http/1.1
/webdata/boardimages/koevent/44ez3eaz175z6bfzafcz79dz596z...http/1.1
snu.ac.kr/_skin/kor/layout/image/icon-more-arrow-right_sm.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/image/guide-select-icon_sm.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-700.woff2http/1.1
snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-500.woff2http/1.1
snu.ac.kr/webdata/uploads/kor/media/2020/02/01_gate.mp4http/1.1
snu.ac.kr/webdata/uploads/kor/media/2020/02/03_library.mp4http/1.1
snu.ac.kr/webdata/uploads/kor/media/2026/04/202604-2020x800_spring.mp4http/1.1
snu.ac.kr/_skin/kor/layout/image/icon-videos-arrow_lg.pnghttp/1.1
snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-700.woff2http/1.1
snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-500.woff2http/1.1
snu.ac.kr/_skin/kor/layout/ico/favicon.icohttp/1.1

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.

URLTransfer SizeDuration
snu.ac.kr/js/jquery-ui-1.10.js425.1 KiB10.5 s
snu.ac.kr/_skin/kor/layout/css/base.css?ver=2026-02-24457.9 KiB10.5 s
snu.ac.kr/_skin/kor/layout/js/responsive.js?ver=2026-02-244.7 KiB1.3 s
snu.ac.kr/js/slick.min.js?ver=2026-02-2444.4 KiB2.6 s
snu.ac.kr/_skin/kor/layout/js/gnb.js?ver=2026-02-244.1 KiB1.3 s
snu.ac.kr/js/zenda-site.js?ver=2026-02-246.4 KiB1.3 s
snu.ac.kr/js/jquery.js88.0 KiB4.0 s
snu.ac.kr/_skin/kor/layout/css/oldboard.css?ver=2026-02-2415.5 KiB1.8 s
snu.ac.kr/js/jquery-migrate-3.0.0.min.js2.5 KiB1.3 s
snu.ac.kr/_skin/kor/layout/js/webfont.js15.6 KiB1.8 s

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.

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

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: 440 ms 59.7 KiB
URLTransfer SizeEst Savings
snu.ac.kr/_skin/kor/layout/css/base.css?ver=2026-02-24457.9 KiB57.5 KiB
snu.ac.kr/_skin/kor/layout/css/oldboard.css?ver=2026-02-2415.5 KiB2.2 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: 440 ms 145.4 KiB
URLTransfer SizeEst Savings
snu.ac.kr/js/jquery-ui-1.10.js422.5 KiB141.8 KiB
inline: $(function() { /…10.0 KiB3.6 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: 2.2 s 456.0 KiB
URLTransfer SizeEst Savings
snu.ac.kr/_skin/kor/layout/css/base.css?ver=2026-02-24455.3 KiB431.9 KiB
snu.ac.kr/_skin/kor/layout/css/oldboard.css?ver=2026-02-2412.9 KiB12.9 KiB
snu.ac.kr/_skin/kor/layout/css/font.css11.2 KiB11.2 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: 2.2 s 468.2 KiB
URLTransfer SizeEst Savings
snu.ac.kr/js/jquery-ui-1.10.js422.5 KiB369.6 KiB
www.googletagmanager.com/gtag/js?id=G-GX37CPT7T3153.0 KiB64.0 KiB
snu.ac.kr/js/jquery.js85.5 KiB34.6 KiB

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.

CategoryTime Spent
Other1.7 s
Script Evaluation506 ms
Style & Layout488 ms
Rendering224 ms
Script Parsing & Compilation109 ms
Parse HTML & CSS65 ms

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reasonFailure type
Pages with cache-control:no-store header cannot enter back/forward cache.Actionable

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.

URLTransfer Size
snu.ac.kr/webdata/uploads/kor/media/2026/04/202604-2020x800_spring.mp44.2 MiB
snu.ac.kr/webdata/uploads/kor/media/2020/02/01_gate.mp43.7 MiB
snu.ac.kr/webdata/uploads/kor/media/2020/02/03_library.mp41.2 MiB
/webdata/boardimages/konews/89bzee0z6faz094za88ze30z7e6z6...623.3 KiB
snu.ac.kr/webdata/kor/instanews/fccz595zc59zc4az988ze6bz1fdzf8fz64ez485zcf.png490.4 KiB
/webdata/boardimages/konews/9d2z6a7zaf9z00bzfd6z945z410z9...481.4 KiB
snu.ac.kr/_skin/kor/layout/font/noto-serif-kr-v6-latin_korean-regular.woff2478.9 KiB
/webdata/boardimages/konews/4fcz6a6zdddz683zb40z8aeza34z7...476.4 KiB
/webdata/boardimages/konews/c94z5d8z835zddez31bz6e4z055zd...469.4 KiB
snu.ac.kr/webdata/kor/instanews/f5bz07dzec1z95az0dfzae1zc47z43az372z180zec.png468.2 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
iF Design Award ul.information-info-acc > li > a > img.web-accessibility-mark
snu.ac.kr/webdata/uploads/kor/image/2021/04/if_designaward2021_red_l_rgb.png
‘도서관 속 작은 펼침, 세상을 여는 큰 열림’, 2026 도서관의 날 도서관 주간 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/4fcz6a6zdddz683zb40z8aeza34z7...
장애인과 함께 살아가는 세상을 위해, 공익법률센터 세미나 ‘공공정책의 수단으로서의 장애인권리협약’ div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/adfza67zaaez74cz61ezd06zc45zd...
무한한 상상, 담대한 도전, 새로운 미래… 개교 80주년 기념 표어·엠블럼 공개 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/4fbzb94z420zedfz0a7zefcz282z9...
여자핸드볼부, 제81회 전국종별핸드볼선수권대회 전승 우승 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/6a7z4d6zc6ez103zaf0zbd9zb38z9...
[샤로잡다 시즌2] 극락도 락이다, 힙불교 제대로 알아보기 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/9d2z6a7zaf9z00bzfd6z945z410z9...
경계 없는 지식의 확산, 서울대학교 공식 유튜브 20만 구독자 돌파 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/c94z5d8z835zddez31bz6e4z055zd...
AI 네이티브 캠퍼스로의 도약, 서울대학교 AI Summit 2026 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/1b6zb2bzab0ze8bz909zedbz21fze...
[샤로잡다 시즌2] 나노기술로 질병도 정복할 수 있을까? div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/konews/89bzee0z6faz094za88ze30z7e6z6...
서울대생을 위한 벚꽃 맛 스티커 li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/c5bze68z98ez3fez481zc8ez6f9z296zc1ez8f0zcf.png
yellow yellow yellow li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/fccz595zc59zc4az988ze6bz1fdzf8fz64ez485zcf.png
Flower Walk at SNU li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/1d0z29dz08az482z07fzfa5zb01zce0z63cz138z5d.png
제66주년 4·19혁명 희생자 추모 li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/2ddzd68z767z535zce8z320z5a4z1a6z46fzde5z6b.png
중간고사 A+ 맞는 주파수 li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/2c0z832zf5fz184ze68z9c6zc28zdffz4c1z485z17.png
Full Blossom at SNU li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/6faz210zd02z51fza6bzccbz968zb42z3ffz440z99.png
눈부신 봄날의 캠퍼스 li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/f5bz07dzec1z95az0dfzae1zc47z43az372z180zec.png
26학번 새내기 앙케이트 li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/ff3zec8zf37zeecz847zdbbz01ez048z2d4za5bzdf.png
교수님! 출연해주세요! li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/89bzb4fzeacz13azfc7z4f9z9d9z8ebz1f6z313zd0.png
샤대타로 li.slick-slide > a > div.caption-item > img
snu.ac.kr/webdata/kor/instanews/000z6e6ze1dzd19z3abz09bz00ezd19zcafz104z0e.png
샤인기부, 당신이 만드는 빛나는 변화, 샤인 굿즈 받기 div#skip-content > div.ly-container > a.inner > img.only-mobile
snu.ac.kr/webdata/uploads/kor/image/2025/04/main_banner_20250429_mobile.jpg
새로 제2형 당뇨병을 진단받은 남성 흡연자, 금연 후 ‘체중 유지’가 골절 위험 낮춘다 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/kohighlight/fc9zd8dze5czcb6ze4fz312z...
“몸 안 좋을 때 술 마시면 왜 더 위험할까?”  염증 상황에서의 알코올성 간 손상 기전 규명 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/kohighlight/3c2z3dfzfbaz357zd64z17dz...
고유전체로 밝힌 삼국시대 지역 사회에서의 친족 네트워크와 족내혼 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/kohighlight/825zaf1ze52z6d4zb1azd79z...
고형암 치료의 난제 ‘항원탈락’을 극복하는 차세대 CAR-NK 플랫폼 개발 div.board-index-img1 > a.item > span.thumb > img
/webdata/boardimages/kohighlight/270ze0eza07zb6az3a4z0abz...
80주년 엠블럼 div.nonslider > div.slide > div.slider-copy > img.symbol
snu.ac.kr/webdata/uploads/kor/media/2026/02/80emblem_main.svg
지금 서울대학교에서는 div.common-boardtitle > div.bg-wrap > h2.title > img.only-mobile
snu.ac.kr/webdata/uploads/kor/image/2019/12/index-board01-title_sm.png
서울대학교 캘린더 div.common-boardtitle > div.bg-wrap > p.title > img.only-mobile
snu.ac.kr/webdata/uploads/kor/image/2019/12/index-board02-title_sm.png
과학기술정보통신부 WEB ACCESSIBILITY 마크(웹 접근성 품질인증 마크) div.information-footer-inner > ul.information-info-acc > li > img.only-mobile
snu.ac.kr/_skin/kor/layout/image/footer-wa_sm.png
SNUNOW ul.social-ul > li > a > img.only-mobile
snu.ac.kr/_skin/kor/layout/image/footer-snunow_sm.png
인스타그램 ul.social-ul > li > a > img.only-mobile
snu.ac.kr/_skin/kor/layout/image/footer-instagram_sm.png
스누새편지 ul.social-ul > li > a > img.only-mobile
snu.ac.kr/_skin/kor/layout/image/footer-snubird_sm.png
유튜브 ul.social-ul > li > a > img.only-mobile
snu.ac.kr/_skin/kor/layout/image/footer-youtube_sm.png
페이스북 ul.social-ul > li > a > img.only-mobile
snu.ac.kr/_skin/kor/layout/image/footer-facebook_sm.png

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

●Layout shift culprits
●Optimize DOM size
●Forced reflow
●Optimize viewport for mobile
●User Timing marks and measures 5 user timings
●JavaScript execution time 0.5 s
●Avoid long main-thread tasks 5 long tasks found
●Avoid non-composited animations 10 animated elements found
●Network Requests
●Network Round Trip Times 290 ms
●Server Backend Latencies 20 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Avoid multiple page redirects
●Initial server response time was short Root document took 390 ms
●Avoid large layout shifts 1 layout shift found
○INP breakdown
80

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.

ARIA

Focusable descendents within an `[aria-hidden="true"]` element prevent those interactive elements from being available to users of assistive technologies like screen readers. Learn how `aria-hidden` affects focusable elements.

Why this matters

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

Source: MDN Permissions-Policy

Failing Elements
인스타그램 yellow yellow yellow 캠퍼스는 지금 노랑노랑노랑! ul.instaslide > div.slick-list > div.slick-track > li.slick-slide
인스타그램 Flower Walk at SNU 꽃으로 만개한 봄날의 캠퍼스, 함께 걸을까요? ul.instaslide > div.slick-list > div.slick-track > li.slick-slide
인스타그램 제66주년 4·19혁명 희생자 추모 제66주년 4·19 혁명 희생자 추모행사가 금일 오전, 서울대학교 4·19 혁명 희생자 추모공… ul.instaslide > div.slick-list > div.slick-track > li.slick-slide
인스타그램 중간고사 A+ 맞는 주파수 여러분의 중간고사 대박을 응원합니다! ul.instaslide > div.slick-list > div.slick-track > li.slick-slide
인스타그램 Full Blossom at SNU 완연히 만개한 서울대학교 봄 풍경 ul.instaslide > div.slick-list > div.slick-track > li.slick-slide
인스타그램 눈부신 봄날의 캠퍼스 눈부시게 빛나는 봄날의 캠퍼스 풍경 ul.instaslide > div.slick-list > div.slick-track > li.slick-slide
인스타그램 26학번 새내기 앙케이트 26학번 새내기에게 묻는다! 서울대학교 입학 후 가장 하고싶었던 일은?! ul.instaslide > div.slick-list > div.slick-track > li.slick-slide
인스타그램 교수님! 출연해주세요! 교수님! 〈샤로잡다〉에 추천해주세요! 학생들이 직접 추천한 교수님들?! 누가 있을까요~? ul.instaslide > div.slick-list > div.slick-track > li.slick-slide
인스타그램 샤대타로 여러분의 1학기 운세, 지금 샤대타로에서 확인해보세요! ul.instaslide > div.slick-list > div.slick-track > li.slick-slide

These are opportunities to improve the usage of ARIA in your application which 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
08826 서울시 관악구 관악로 1 서울대학교 div.information-info > div.information-info-area > div.area-address > span
TEL. (02) 880-5114 div.information-info > div.information-info-area > div.area-address > span
(02) 880-5114 div.information-info-area > div.area-address > span > a.tel
FAX. (02) 885-5272 div.information-info > div.information-info-area > div.area-address > span
Copyright 2026 Seoul National University All Rights Reserved. div.information-info > div.information-info-area > div.area-copy > p

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
이전 인스타그램 서울대생을 위한 벚꽃 맛 스티커 서울대생을 위한 벚꽃 맛 스티커 등장! 인스타그램 yellow yellow yellow … main.ly-main > div#skip-content > section.ly-section > ul.instaslide
정보공시 교내기관 안내 서울대포털 클린행정센터 개인정보처리방침 이메일무단수집거부 복지보조금 부정 신고 사이트맵 div.information-footer > div.information-footer-inner > div.information-terms > ul.terms-ul

Screen readers require list items (`<li>`) to be contained within a parent `<ul>`, `<ol>` or `<menu>` to be announced properly. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
인스타그램 서울대생을 위한 벚꽃 맛 스티커 서울대생을 위한 벚꽃 맛 스티커 등장! ul.instaslide > div.slick-list > div.slick-track > li.slick-slide

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

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
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●Select elements have associated label elements.
●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
●Links are distinguishable without relying on color.
●Links have a discernible name
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●Skip links are focusable.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●`<video>` elements contain a `<track>` element with `[kind="captions"]`
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○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
○The page contains a heading, skip link, or landmark region
○`<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
○`<frame>` or `<iframe>` elements have a title
○`<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
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○No element has a `[tabindex]` value greater than 0
○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
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Identical links have the same purpose.
○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.
92

Best Practices

General

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
www.googletagmanager.com/gtag/js?id=G-GX37CPT7T3 line 222, col 390
Connecting to 'https://region1.google-analytics.com/g/collect?v=2&tid=G-GX37CPT7T3&gtm=45je64k0v884708608za200zd884708608&_p=1776893156964&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1056506807.1776893157&frm=0&pscdl=noapi&rcb=5&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266400~117512542&sid=1776893157&sct=1&seg=0&dl=https%3A%2F%2Fsnu.ac.kr%2F&dt=%EC%84%9C%EC%9A%B8%EB%8C%80%ED%95%99%EA%B5%90&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=5612' violates the following Content Security Policy directive: "default-src 'self' https://www.snu.ac.kr https://en.snu.ac.kr https://admission.snu.ac.kr https://identity.snu.ac.kr https://adminservice.snu.ac.kr https://www.google-analytics.com https://nam.veta.naver.com https://wcs.naver.com https://www.google-analytics.com". Note that 'connect-src' was not explicitly set, so 'default-src' is used as a fallback. The action has been blocked.
www.googletagmanager.com/gtag/js?id=G-GX37CPT7T3 line 222, col 390
Fetch API cannot load https://region1.google-analytics.com/g/collect?v=2&tid=G-GX37CPT7T3&gtm=45je64k0v884708608za200zd884708608&_p=1776893156964&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1056506807.1776893157&frm=0&pscdl=noapi&rcb=5&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266400~117512542&sid=1776893157&sct=1&seg=0&dl=https%3A%2F%2Fsnu.ac.kr%2F&dt=%EC%84%9C%EC%9A%B8%EB%8C%80%ED%95%99%EA%B5%90&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=5612. Refused to connect because it violates the document's Content Security Policy.

Issues logged to the `Issues` panel in Chrome Devtools indicate unresolved problems. They can come from network request failures, insufficient security controls, and other browser concerns. Open up the Issues panel in Chrome DevTools for more details on each issue.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Issue type
Content security policy
●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
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
92

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

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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