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https://snu.ac.kr

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
55
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
79
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

5.35 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

10.27 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

10.90 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

10.63 s

Page Load Progression

2.1 s
4.2 s
6.4 s
8.5 s
10.6 s
12.7 s
14.8 s
17.0 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
24.7 MB transferred, 94 requests
FIX
24.7 MB transferred, 94 requests
Critical::
Page weighs 25.0 MB (24.7 MB transferred)
Warning::
Images are 7.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 7.8 MB
Info::
Fonts are 1.1 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.1 MB
Warning::
JavaScript is 773 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 773 KB
Info::
CSS is 487 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 487 KB
Info::
94 HTTP requests
Info::
Estimated 5.2 g CO2 per page load
24.7 MB / 2.4 MB budget
24.7 MB transferred
94 requests
5.2 g CO2 per page load
Other 14.5 MiB 58%
Images 7.8 MiB 31%
Fonts 1.1 MiB 5%
JavaScript 772.8 KiB 3%
CSS 487.2 KiB 2%
HTML 140.8 KiB 1%
Other 6.4 KiB 0%
Other 767 B 0%
Other 317 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

F
JS Bundles
Action
11 scripts, 468 KB unused
FIX
11 scripts, 468 KB unused
Warning::
https://snu.ac.kr/js/jquery-ui-1.10.js: 370 KB unused (87%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://snu.ac.kr/js/jquery-ui-1.10.js: unminified — 142 KB could be saved
Warning::
https://www.googletagmanager.com/gtag/js?id=G-GX37...: 64 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://snu.ac.kr/js/jquery.js: 35 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 468 KB
468 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://snu.ac.kr/js/jquery-ui-1.10.js425 KB370 KB (87%)✗1st
https://www.googletagmanager.com/gtag/js?id=G-GX37CPT7T3153 KB64 KB (42%)✓3rd
https://snu.ac.kr/js/jquery.js88 KB35 KB (41%)✓1st
https://snu.ac.kr/_skin/kor/layout/js/webfont.js16 KB—✓1st
https://snu.ac.kr/js/jquery-migrate-3.0.0.min.js3 KB—✓1st
https://snu.ac.kr/js/slick.min.js?ver=2026-02-2444 KB—✓1st
https://snu.ac.kr/js/zenda-site.js?ver=2026-02-246 KB—✓1st
https://snu.ac.kr/_skin/kor/layout/js/gnb.js?ver=2026-02-244 KB—✓1st
https://snu.ac.kr/_skin/kor/layout/js/responsive.js?ver=2026-02-245 KB—✓1st
https://wcs.naver.net/wcslog.js11 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

D
Page Weight Inventory
Action
94 resources · 24.7 MB · 468 KB savings available
FIX
94 resources · 24.7 MB · 468 KB savings available
Warning::
Page weight 23.7 MB over 1MB target
Got: 24.7 MB Expected: ≤ 1 MB
Info::
~468 KB of savings available
Info::
5 third-party resources (1% of weight)
Info::
28 resources over 200KB
94 resources · 24.7 MiB · 5 third-party 23.7 MiB over 1MB target
Media 58% · 14.5 MiB
Image 31% · 7.8 MiB
Font 5% · 1.1 MiB
JavaScript 3% · 772.8 KiB
CSS 2% · 487.2 KiB
Document 1% · 140.8 KiB
Other 0% · 1.1 KiB

~467.8 KiB of savings available

Remove unused JavaScript: 467.8 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store, no-cache, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, no-cache, must-revalidate

DirectiveValueMeaning
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
C
Image Optimization
Action
65 images, 0 KB saveable
REVIEW
65 images, 0 KB saveable
Warning::
https://snu.ac.kr/webdata/boardimages/konews/4fcz6... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/boardimages/kohighlight/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/boardimages/konews/c94z5... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/kor/instanews/c5bze68z98... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/kor/instanews/ff3zec8zf3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/kor/instanews/6faz210zd0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/_skin/kor/layout/image/footer-wa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/kor/instanews/000z6e6ze1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/kor/instanews/fccz595zc5... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/_skin/kor/layout/image/footer-fa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/boardimages/kohighlight/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/uploads/kor/image/2025/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/kor/instanews/89bzb4fzea... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/_skin/kor/layout/image/footer-yo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/kor/instanews/1d0z29dz08... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/uploads/kor/image/2019/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/_skin/kor/layout/image/footer-sn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/boardimages/konews/adfza... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/boardimages/kohighlight/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/boardimages/konews/6a7z4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/boardimages/konews/1b6zb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/kor/instanews/2c0z832zf5... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/boardimages/konews/4fbzb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/boardimages/konews/89bze... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/_skin/kor/layout/image/footer-in... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/kor/instanews/f5bz07dzec... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/_skin/kor/layout/image/footer-sn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/uploads/kor/image/2021/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/uploads/kor/image/2019/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/uploads/kor/media/2026/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/boardimages/konews/9d2z6... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/boardimages/kohighlight/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://snu.ac.kr/webdata/kor/instanews/2ddzd68z76... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
65 images 7.8 MB
0 oversized -0 KB
65 legacy format
33 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

B
JS Execution Cost
785ms total JS execution
REVIEW
785ms total JS execution
Warning::
Unattributable: 400ms CPU time
Warning::
https://snu.ac.kr/: 256ms CPU time
Info::
https://snu.ac.kr/js/jquery.js: 69ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-GX37...: 60ms CPU time
Warning::
Third-party scripts: 460ms (59% of total)

Main Thread Breakdown

Other 56% Style & Layout 17% Script Evaluation 15% Rendering 6% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
Unattributable400ms5ms0ms3rd
https://snu.ac.kr/256ms8ms1ms1st
https://snu.ac.kr/js/jquery.js69ms41ms2ms1st
https://www.googletagmanager.com/gtag/js?id=G-GX37CPT7T360ms50ms9ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
1% third-party, 0 ms blocking
PASS
1% third-party, 0 ms blocking
Info::
Third-party code accounts for 1% of page weight (183.1 KiB of 24.7 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
7 fonts (1172 KB)
PASS
7 fonts (1172 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

1172 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 5.4 s LCP 10.3 shttps://snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-regular.woff2roboto-v18-latin-regula... https://snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-regular.woff2 — 17.5 KiB — 339 ms — font-display: swaphttps://snu.ac.kr/_skin/kor/layout/font/noto-serif-kr-v6-latin_korean-regular.woff2noto-serif-kr-v6-latin_... https://snu.ac.kr/_skin/kor/layout/font/noto-serif-kr-v6-latin_korean-regular.woff2 — 478.9 KiB — 2.6 s — font-display: swaphttps://snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-regular.woff2noto-sans-kr-v8-korean-... https://snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-regular.woff2 — 209.7 KiB — 2.5 s — font-display: swaphttps://snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-700.woff2roboto-v18-latin-700.woff2 https://snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-700.woff2 — 17.6 KiB — 454 ms — font-display: swaphttps://snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-500.woff2roboto-v18-latin-500.woff2 https://snu.ac.kr/_skin/kor/layout/font/roboto-v18-latin-500.woff2 — 17.7 KiB — 515 ms — font-display: swaphttps://snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-700.woff2noto-sans-kr-v8-korean-... https://snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-700.woff2 — 217.9 KiB — 1.3 s — font-display: swaphttps://snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-500.woff2noto-sans-kr-v8-korean-... https://snu.ac.kr/_skin/kor/layout/font/noto-sans-kr-v8-korean-500.woff2 — 212.1 KiB — 996 ms — font-display: swap
roboto-v18-latin-regula... woff2 swap
Size 18 KB
Load time 339 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
noto-serif-kr-v6-latin_... woff2 swap
Size 479 KB
Load time 2.6 s
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
noto-sans-kr-v8-korean-... woff2 swap
Size 210 KB
Load time 2.5 s
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
roboto-v18-latin-700.woff2 woff2 swap
Size 18 KB
Load time 454 ms
Start 5.4 s
Risk FOUT — text flashes from fallback to web font
roboto-v18-latin-500.woff2 woff2 swap
Size 18 KB
Load time 515 ms
Start 5.4 s
Risk FOUT — text flashes from fallback to web font
noto-sans-kr-v8-korean-... woff2 swap
Size 218 KB
Load time 1.3 s
Start 5.9 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
noto-sans-kr-v8-korean-... woff2 swap
Size 212 KB
Load time 996 ms
Start 5.9 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~559 KB and ~1118 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
94 requests over 14679ms
INFO
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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
59% of JavaScript execution is third-party
First-party Third-party 460ms · 153KB · ₩10735/mo
Unattributable
Other
Costly
Execution 400ms
Transfer 0 KB
Monthly Cost ₩9344/mo
Google Tag Manager
Tag Manager
Costly
Execution 60ms
Transfer 153 KB
Unused 42%
Monthly Cost ₩1391/mo

These scripts may cost more than they're worth

  • Unattributable adds 400ms and costs ~₩9344/month
  • Google Tag Manager adds 60ms and costs ~₩1391/month

59% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 400ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 60ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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