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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
16
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
98
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

5.12 s

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

14.11 s

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

934 ms

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

1.000

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

5.66 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.

24.57 s

Page Load Progression

570 ms
1.1 s
1.7 s
2.3 s
2.9 s
3.4 s
4.0 s
4.6 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
11.1 MB transferred, 112 requests
FIX
11.1 MB transferred, 112 requests
Critical::
Page weighs 18.0 MB (11.1 MB transferred)
Warning::
Images are 1.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.8 MB
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Info::
Fonts are 488 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 488 KB
Info::
CSS is 262 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 262 KB
Warning::
112 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.3 g CO2 per page load
11.1 MB / 2.4 MB budget
11.1 MB transferred
112 requests
2.3 g CO2 per page load
Other 7.0 MiB 63%
Images 1.8 MiB 16%
JavaScript 1.5 MiB 13%
Fonts 487.8 KiB 4%
CSS 262.1 KiB 2%
HTML 52.3 KiB 0%
Other 9.2 KiB 0%
Other 7.9 KiB 0%
Other 2.7 KiB 0%
Other 595 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

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

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

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (11.1 MiB of 11.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4281ms total JS execution
FIX
4281ms total JS execution
Warning::
https://www.jhu.edu/: 1016ms CPU time
Warning::
https://www.jhu.edu/assets/themes/shared/assets/js...: 850ms CPU time
Warning::
Unattributable: 675ms CPU time
Warning::
https://www.jhu.edu/cdn-cgi/challenge-platform/scr...: 279ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-TSX9...: 236ms CPU time
Warning::
Third-party scripts: 4281ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 24% Style & Layout 15% Script Parsing & Compilation 7% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.jhu.edu/1016ms42ms6ms3rd
https://www.jhu.edu/assets/themes/shared/assets/js/logger.js?ver=10c509275f386f750341850ms749ms11ms3rd
Unattributable675ms26ms0ms3rd
https://www.jhu.edu/cdn-cgi/challenge-platform/scripts/jsd/main.js279ms268ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-TSX9K66082&cx=c&gtm=4e64h1236ms192ms43ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js220ms141ms73ms3rd
https://www.googletagmanager.com/gtag/js?id=G-8031WYVC9V&cx=c&gtm=4e64h1208ms170ms36ms3rd
https://www.jhu.edu/assets/themes/machado/assets/css/base.css?ver=3a245030ae1d43119ce9195ms0ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P2FG28R160ms120ms36ms3rd
https://connect.facebook.net/en_US/fbevents.js136ms101ms34ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
27 scripts, 766 KB unused
FIX
27 scripts, 766 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-8031...: 71 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P2F...: 65 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 766 KB
766 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-8031WYVC9V&cx=c&gtm=4e64h1170 KB71 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P2FG28R130 KB65 KB (50%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-TSX9K66082&cx=c&gtm=4e64h1152 KB65 KB (42%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB35 KB (36%)✓3rd
https://www.jhu.edu/assets/themes/shared/assets/js/callout.js?ver=eed37df7f6dda1dfae451 KB—✓3rd
https://www.jhu.edu/wp/wp-includes/js/jquery/jquery.min.js?ver=3.7.130 KB—✓3rd
https://www.jhu.edu/wp/wp-includes/js/dist/vendor/lodash.min.js?ver=4.17.2124 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

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

F
Page Weight Inventory
Action
112 resources · 11.1 MB · 766 KB savings available
FIX
112 resources · 11.1 MB · 766 KB savings available
Warning::
Page weight 10.1 MB over 1MB target
Got: 11.1 MB Expected: ≤ 1 MB
Info::
~766 KB of savings available
Warning::
111 third-party resources (100% of weight)
Info::
5 resources over 200KB
112 resources · 11.1 MiB · 111 third-party 10.1 MiB over 1MB target
Media 63% · 7.0 MiB
Image 16% · 1.8 MiB
JavaScript 13% · 1.5 MiB
Font 4% · 487.8 KiB
CSS 2% · 262.1 KiB
Document 1% · 61.7 KiB
Other 0% · 8.9 KiB

~766.4 KiB of savings available

Remove unused JavaScript: 766.4 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
50 images, 0 KB saveable
REVIEW
50 images, 0 KB saveable
Warning::
https://www.jhu.edu/assets/themes/machado/src/asse... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.jhu.edu/assets/themes/machado/src/asse... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
50 images 1.8 MB
0 oversized -0 KB
47 legacy format
2 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
10 fonts (488 KB)
PASS
10 fonts (488 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

488 KB total

Render-blocking

0

of 10

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 12.0 s 14.0 s FCP 5.1 s LCP 14.1 shttps://fonts.gstatic.com/s/worksans/v24/QGYsz_wNahGAdqQ43Rh_fKDptfpA4Q.woff2QGYsz_wNahGAdqQ43Rh_fKD... https://fonts.gstatic.com/s/worksans/v24/QGYsz_wNahGAdqQ43Rh_fKDptfpA4Q.woff2 — 49.4 KiB — 41 ms — font-display: swaphttps://fonts.gstatic.com/s/worksans/v24/QGY_z_wNahGAdqQ43RhVcIgYT2Xz5u32K3vXBi8Jpo3fKyE.woff2QGY_z_wNahGAdqQ43RhVcIg... https://fonts.gstatic.com/s/worksans/v24/QGY_z_wNahGAdqQ43RhVcIgYT2Xz5u32K3vXBi8Jpo3fKyE.woff2 — 20.4 KiB — 36 ms — font-display: swaphttps://www.jhu.edu/assets/themes/machado/assets/fonts/fa-solid-900.fb8184ad.woff2fa-solid-900.fb8184ad.w... https://www.jhu.edu/assets/themes/machado/assets/fonts/fa-solid-900.fb8184ad.woff2 — 153.1 KiB — 61 ms — font-display: swaphttps://www.jhu.edu/assets/themes/machado/assets/fonts/fa-regular-400.e931bc0d.woff2fa-regular-400.e931bc0d... https://www.jhu.edu/assets/themes/machado/assets/fonts/fa-regular-400.e931bc0d.woff2 — 25.1 KiB — 56 ms — font-display: swaphttps://www.jhu.edu/assets/themes/machado/assets/fonts/fa-brands-400.8d3cabfc.woff2fa-brands-400.8d3cabfc.... https://www.jhu.edu/assets/themes/machado/assets/fonts/fa-brands-400.8d3cabfc.woff2 — 114.9 KiB — 58 ms — font-display: swaphttps://use.typekit.net/af/d75c30/00000000000000007735a638/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3l https://use.typekit.net/af/d75c30/00000000000000007735a638/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3 — 21.2 KiB — 8 ms — font-display: swaphttps://fonts.gstatic.com/s/oswald/v57/TK3iWkUHHAIjg752GT8Gl-1PKw.woff2TK3iWkUHHAIjg752GT8Gl-1... https://fonts.gstatic.com/s/oswald/v57/TK3iWkUHHAIjg752GT8Gl-1PKw.woff2 — 27.8 KiB — 32 ms — font-display: swaphttps://use.typekit.net/af/a9e592/00000000000000007735a63c/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n9&v=3l https://use.typekit.net/af/a9e592/00000000000000007735a63c/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n9&v=3 — 21.2 KiB — 12 ms — font-display: swaphttps://use.typekit.net/af/981a99/00000000000000007735a62a/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/981a99/00000000000000007735a62a/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 20.9 KiB — 13 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 68 ms — font-display: swap
QGYsz_wNahGAdqQ43Rh_fKD... woff2 swap
Size 49 KB
Load time 41 ms
Start 909 ms
Risk FOUT — text flashes from fallback to web font
QGY_z_wNahGAdqQ43RhVcIg... woff2 swap
Size 20 KB
Load time 36 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
fa-solid-900.fb8184ad.w... woff2 swap
Size 153 KB
Load time 61 ms
Start 1.0 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
fa-regular-400.e931bc0d... woff2 swap
Size 25 KB
Load time 56 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
fa-brands-400.8d3cabfc.... woff2 swap
Size 115 KB
Load time 58 ms
Start 1.0 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
l woff2 swap
Size 21 KB
Load time 8 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
TK3iWkUHHAIjg752GT8Gl-1... woff2 swap
Size 28 KB
Load time 32 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 21 KB
Load time 12 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 21 KB
Load time 13 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 68 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
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 ~134 KB and ~268 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
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
112 requests over 2268ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 5.1 s LCP 14.1 shttps://jhu.edu// https://jhu.edu/ — 301 — 195 B — 428 ms — http/1.1https://www.jhu.edu/www.jhu.edu/ https://www.jhu.edu/ — 200 — 24.8 KiB — 90 ms — h2https://www.jhu.edu/assets/themes/machado/assets/css/base.css?ver=3a245030ae1d43119ce9www.jhu.edu/assets/themes/machado/a... https://www.jhu.edu/assets/themes/machado/assets/css/base.css?ver=3a245030ae1d43119ce9 — 200 — 194.3 KiB — 82 ms — h2https://www.jhu.edu/assets/themes/machado/assets/css/home.css?ver=76ae86743fa2e5ff3c8cwww.jhu.edu/assets/themes/machado/a... https://www.jhu.edu/assets/themes/machado/assets/css/home.css?ver=76ae86743fa2e5ff3c8c — 200 — 20.4 KiB — 58 ms — h2https://www.jhu.edu/wp/wp-includes/js/dist/vendor/wp-polyfill.min.js?ver=3.15.0www.jhu.edu/wp/wp-includes/js/dist/... https://www.jhu.edu/wp/wp-includes/js/dist/vendor/wp-polyfill.min.js?ver=3.15.0 — 200 — 11.7 KiB — 42 ms — h2https://www.jhu.edu/assets/themes/shared/assets/js/logger.js?ver=10c509275f386f750341www.jhu.edu/assets/themes/shared/as... https://www.jhu.edu/assets/themes/shared/assets/js/logger.js?ver=10c509275f386f750341 — 200 — 42.8 KiB — 40 ms — h2https://www.jhu.edu/assets/themes/shared/assets/js/modernizr.js?ver=291b8c292d0735d630d5www.jhu.edu/assets/themes/shared/as... https://www.jhu.edu/assets/themes/shared/assets/js/modernizr.js?ver=291b8c292d0735d630d5 — 200 — 3.0 KiB — 77 ms — h2https://fonts.googleapis.com/css2?family=Work+Sans:wght@500&display=swapfonts.googleapis.com/css2?family=Wo... https://fonts.googleapis.com/css2?family=Work+Sans:wght@500&display=swap — 200 — 958 B — 97 ms — h2https://www.jhu.edu/assets/themes/machado/src/assets/images/logos/university-logo-small-horizontal-white.svgwww.jhu.edu/assets/themes/machado/s... https://www.jhu.edu/assets/themes/machado/src/assets/images/logos/university-logo-small-horizontal-white.svg — 200 — 8.6 KiB — 42 ms — h2https://www.jhu.edu/assets/themes/machado/src/assets/images/logos/university-logo-small-horizontal-white.pngwww.jhu.edu/assets/themes/machado/s... https://www.jhu.edu/assets/themes/machado/src/assets/images/logos/university-logo-small-horizontal-white.png — 200 — 26.3 KiB — 76 ms — h2https://www.jhu.edu/assets/themes/machado/src/assets/images/logos/university-logo-small-vertical-white.svgwww.jhu.edu/assets/themes/machado/s... https://www.jhu.edu/assets/themes/machado/src/assets/images/logos/university-logo-small-vertical-white.svg — 200 — 8.6 KiB — 34 ms — h2https://www.jhu.edu/assets/themes/shared/assets/js/rave.js?ver=eccb97754c1f775ab30awww.jhu.edu/assets/themes/shared/as... https://www.jhu.edu/assets/themes/shared/assets/js/rave.js?ver=eccb97754c1f775ab30a — 200 — 731 B — 32 ms — h2https://www.jhu.edu/assets/themes/shared/assets/js/site-alert.js?ver=fb546e330f1d154c2902www.jhu.edu/assets/themes/shared/as... 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https://analytics.twitter.com/i/adsct?bci=3&dv=UTC%26en-US%2Cen%26Google%20Inc.%26Linux%20x86_64%26255%26412%26823%264%2624%26412%26823%261%26na&eci=2&event_id=893e3ae7-aa34-4910-9810-0cce1a4cb3bf&events=%5B%5B%22pageview%22%2C%7B%7D%5D%5D&integration=advertiser&p_id=Twitter&p_user_id=0&pl_id=27bf76b3-5a0c-476f-967e-a930a09d798a&pt=Johns%20Hopkins%20University&tw_document_href=https%3A%2F%2Fwww.jhu.edu%2F&tw_iframe_status=0&tw_order_quantity=0&tw_pid_src=1&tw_sale_amount=0&twpid=tw.1776798044404.546627902102824216&txn_id=o1w55&type=javascript&version=2.3.53 — 200 — 675 B — 217 ms — h2https://www.google.com/recaptcha/api2/anchor?ar=1&k=6LclNtkZAAAAANENXb4rH5E6uT1RlbUCAFvjxJYj&co=aHR0cHM6Ly93d3cuamh1LmVkdTo0NDM.&hl=en&v=gTpTIWhbKpxADzTzkcabhXN4&size=invisible&anchor-ms=20000&execute-ms=30000&cb=oqwtbbs1wn4gwww.google.com/recaptcha/api2/ancho... 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https://region1.google-analytics.com/g/collect?v=2&tid=G-TSX9K66082&gtm=45je64h1v887955877z879402419za20gzb79402419zd79402419&_p=1776798043436&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1795935395.1776798045&frm=0&pscdl=noapi&rcb=11&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=0~115616986~115938466~115938469~117266400~117512543~118463261&sid=1776798044&sct=1&seg=0&dl=https%3A%2F%2Fwww.jhu.edu%2F&dt=Johns%20Hopkins%20University&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1643 — 204 — 547 B — 94 ms — h2https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/styles__ltr.csswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/styles__ltr.css — 200 — 42.1 KiB — 99 ms — h2https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 361.9 KiB — 161 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-8031WYVC9V&gtm=45je64h1v880689630z879402419za20gzb79402419zd79402419&_p=1776798043436&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1795935395.1776798045&frm=0&pscdl=noapi&rcb=12&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=0~115616985~115938466~115938469~117266400~117512543~118128923&sid=1776798044&sct=1&seg=0&dl=https%3A%2F%2Fwww.jhu.edu%2F&dt=Johns%20Hopkins%20University&en=page_view&_fv=1&_ss=1&ep.viewport_size=412x823&tfd=1697region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-8031WYVC9V&gtm=45je64h1v880689630z879402419za20gzb79402419zd79402419&_p=1776798043436&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1795935395.1776798045&frm=0&pscdl=noapi&rcb=12&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=0~115616985~115938466~115938469~117266400~117512543~118128923&sid=1776798044&sct=1&seg=0&dl=https%3A%2F%2Fwww.jhu.edu%2F&dt=Johns%20Hopkins%20University&en=page_view&_fv=1&_ss=1&ep.viewport_size=412x823&tfd=1697 — 204 — 48 B — 42 ms — h2https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4www.google.com/recaptcha/api2/webwo... https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4 — 200 — 23 B — 162 ms — h3https://www.gstatic.com/recaptcha/api2/logo_48.pngwww.gstatic.com/recaptcha/api2/logo... https://www.gstatic.com/recaptcha/api2/logo_48.png — 200 — 2.3 KiB — 25 ms — h2https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2fonts.gstatic.com/s/roboto/v48/KFO7... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 200 — 33.9 KiB — 68 ms — h3https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 0 B — 19 ms — h2https://www.facebook.com/tr/?id=1580540818936438&ev=PageView&dl=https%3A%2F%2Fwww.jhu.edu%2F&rl=&if=false&ts=1776798044945&sw=412&sh=823&v=2.9.303&r=stable&ec=0&o=30&ler=empty&cdl=API_unavailable&pmd[title]=Johns%20Hopkins%20University&pmd[locale]=en&pmd[description]=Johns%20Hopkins%2C%20founded%20in%201876%2C%20is%20America%27s%20first%20research%20university%20and%20home%20to%20nine%20world-class%20academic%20divisions%20working%20together%20as%20one%20university&plt=1154.8000001907349&it=1776798044332&coo=false&chmd=moto%20g%20power%20(2022)&chpv=11.0&chfv=undefined&expv2[0]=pl0&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=ct1&expv2[6]=hf1&rqm=GETwww.facebook.com/tr/?id=15805408189... 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h3https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=1580540818936438&ev=PageView&dl=https%3A%2F%2Fwww.jhu.edu%2F&rl=&if=false&ts=1776798044945&sw=412&sh=823&v=2.9.303&r=stable&ec=0&o=30&ler=empty&cdl=API_unavailable&pmd[title]=Johns%20Hopkins%20University&pmd[locale]=en&pmd[description]=Johns%20Hopkins%2C%20founded%20in%201876%2C%20is%20America%27s%20first%20research%20university%20and%20home%20to%20nine%20world-class%20academic%20divisions%20working%20together%20as%20one%20university&plt=1154.8000001907349&it=1776798044332&coo=false&chmd=moto%20g%20power%20(2022)&chpv=11.0&chfv=undefined&expv2[0]=pl0&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=ct1&expv2[6]=hf1&rqm=FGETwww.facebook.com/privacy_sandbox/pi... https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=1580540818936438&ev=PageView&dl=https%3A%2F%2Fwww.jhu.edu%2F&rl=&if=false&ts=1776798044945&sw=412&sh=823&v=2.9.303&r=stable&ec=0&o=30&ler=empty&cdl=API_unavailable&pmd[title]=Johns%20Hopkins%20University&pmd[locale]=en&pmd[description]=Johns%20Hopkins%2C%20founded%20in%201876%2C%20is%20America%27s%20first%20research%20university%20and%20home%20to%20nine%20world-class%20academic%20divisions%20working%20together%20as%20one%20university&plt=1154.8000001907349&it=1776798044332&coo=false&chmd=moto%20g%20power%20(2022)&chpv=11.0&chfv=undefined&expv2[0]=pl0&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=ct1&expv2[6]=hf1&rqm=FGET — 200 — 196 B — 175 ms — h3https://www.jhu.edu/assets/themes/shared/src/assets/images/favicons/manifest.jsonwww.jhu.edu/assets/themes/shared/sr... https://www.jhu.edu/assets/themes/shared/src/assets/images/favicons/manifest.json — 403 — 4.1 KiB — 22 ms — h2https://www.jhu.edu/assets/themes/shared/src/assets/images/favicons/favicon-32x32.pngwww.jhu.edu/assets/themes/shared/sr... https://www.jhu.edu/assets/themes/shared/src/assets/images/favicons/favicon-32x32.png — 200 — 2.1 KiB — 36 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 4281ms · 861KB · $57/mo
www.jhu.edu
Other
Costly
Execution 1016ms
Transfer 25 KB
Monthly Cost $13/mo
www.jhu.edu
Other
Costly
Execution 850ms
Transfer 43 KB
Monthly Cost $11/mo
Unattributable
Other
Costly
Execution 675ms
Transfer 0 KB
Monthly Cost $9/mo
www.jhu.edu
Other
Costly
Execution 279ms
Transfer 0 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 236ms
Transfer 152 KB
Unused 42%
Monthly Cost $3/mo
www.gstatic.com
Other
Costly
Execution 220ms
Transfer 0 KB
Unused 49%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 208ms
Transfer 170 KB
Unused 42%
Monthly Cost $3/mo
www.jhu.edu
Other
Optional
Execution 195ms
Transfer 194 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 160ms
Transfer 130 KB
Unused 50%
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 136ms
Transfer 97 KB
Unused 36%
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 130ms
Transfer 39 KB
Monthly Cost $2/mo
www.jhu.edu
Other
Optional
Execution 95ms
Transfer 8 KB
Monthly Cost $1/mo
www.jhu.edu
Other
Optional
Execution 80ms
Transfer 3 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.jhu.edu adds 1016ms and costs ~$13/month
  • www.jhu.edu adds 850ms and costs ~$11/month
  • Unattributable adds 675ms and costs ~$9/month
  • www.jhu.edu adds 279ms and costs ~$4/month
  • Google Tag Manager adds 236ms and costs ~$3/month
  • www.gstatic.com adds 220ms and costs ~$3/month
  • Google Tag Manager adds 208ms and costs ~$3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.jhu.edu takes 1016ms 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

www.jhu.edu takes 850ms 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

Unattributable takes 675ms 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

www.jhu.edu takes 279ms 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 236ms 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

www.gstatic.com takes 220ms 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 208ms 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

50% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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