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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
66
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

1.36 s

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

4.85 s

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

136 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.

2.25 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.

4.93 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
6.3 MB transferred, 54 requests
FIX
6.3 MB transferred, 54 requests
Critical::
Page weighs 8.9 MB (6.3 MB transferred)
Warning::
Images are 5.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.7 MB
Info::
Fonts are 359 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 359 KB
Info::
54 HTTP requests
Info::
Estimated 1.3 g CO2 per page load
6.3 MB / 2.4 MB budget
6.3 MB transferred
54 requests
1.3 g CO2 per page load
Images 5.7 MiB 90%
Fonts 358.8 KiB 6%
JavaScript 177.5 KiB 3%
CSS 69.6 KiB 1%
HTML 6.9 KiB 0%
Other 2.0 KiB 0%
Other 1.0 KiB 0%
Other 231 B 0%
Other 223 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

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 (6.3 MiB of 6.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
54 resources · 6.3 MB · 74 KB savings available
FIX
54 resources · 6.3 MB · 74 KB savings available
Warning::
Page weight 5.3 MB over 1MB target
Got: 6.3 MB Expected: ≤ 1 MB
Info::
~74 KB of savings available
Warning::
53 third-party resources (100% of weight)
Info::
8 resources over 200KB
54 resources · 6.3 MiB · 53 third-party 5.3 MiB over 1MB target
Image 90% · 5.7 MiB
Font 6% · 358.8 KiB
JavaScript 3% · 177.5 KiB
CSS 1% · 69.6 KiB
Document 0% · 6.9 KiB
Other 0% · 2.1 KiB

~74.4 KiB of savings available

Remove unused JavaScript: 74.4 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.

B
Image Optimization
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Info::
All images are well-optimized
26 images 5.7 MB
0 oversized -0 KB
25 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1055ms total JS execution
REVIEW
1055ms total JS execution
Warning::
Unattributable: 354ms CPU time
Warning::
https://babel.hathitrust.org/cgi/ping?callback=HT....: 322ms CPU time
Warning::
https://www.hathitrust.org/: 279ms CPU time
Info::
https://www.hathitrust.org/cdn-cgi/challenge-platf...: 99ms CPU time
Warning::
Third-party scripts: 1055ms (100% of total)

Main Thread Breakdown

Other 31% Script Evaluation 24% Parse HTML & CSS 22% Style & Layout 18% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable354ms6ms0ms3rd
https://babel.hathitrust.org/cgi/ping?callback=HT.postPingCallback&_1776890260921322ms102ms3ms3rd
https://www.hathitrust.org/279ms19ms1ms3rd
https://www.hathitrust.org/cdn-cgi/challenge-platform/scripts/jsd/main.js99ms95ms1ms3rd
B
JS Bundles
9 scripts, 74 KB unused
REVIEW
9 scripts, 74 KB unused
Warning::
https://www.hathitrust.org/common/firebird/dist/as...: 45 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://matomo.www.hathitrust.org/js/container_JBg...: 29 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 74 KB
74 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.hathitrust.org/common/firebird/dist/assets/index-Bh9Bq4WN.js?ver=6.986 KB45 KB (53%)✓3rd
https://matomo.www.hathitrust.org/js/container_JBgjlXyE.js56 KB29 KB (53%)✓3rd
https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/dist/js/scripts.min.js?ver=17720425502 KB—✓3rd
https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/dist/js/cookies.min.js?ver=17720425501 KB—✓3rd
https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/dist/js/highlight.min.js?ver=177204255011 KB—✓3rd
https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/src/js/matomo.js?ver=17101961281 KB—✓3rd
https://babel.hathitrust.org/cgi/ping?callback=HT.postPingCallback&_17768902609219 KB—✓3rd
https://www.hathitrust.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?12 KB—✓3rd
https://matomo.www.hathitrust.org/plugins/HeatmapSessionRecording/configs.php?idsite=1&trackerid=1vLHWp&url=https%3A%2F%2Fwww.hathitrust.org%2F0 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

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
8 fonts (359 KB)
PASS
8 fonts (359 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

359 KB total

Render-blocking

0

of 8

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.4 s LCP 4.8 shttps://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/fonts/mulish-v12-latin-500.woff2mulish-v12-latin-500.woff2 https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/fonts/mulish-v12-latin-500.woff2 — 11.2 KiB — 221 ms — font-display: swaphttps://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-500.woff2mulish-v12-cyrillic_cyr... https://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-500.woff2 — 34.7 KiB — 220 ms — font-display: swaphttps://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-700.woff2mulish-v12-cyrillic_cyr... https://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-700.woff2 — 34.5 KiB — 290 ms — font-display: swaphttps://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-800.woff2mulish-v12-cyrillic_cyr... https://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-800.woff2 — 34.6 KiB — 229 ms — font-display: swaphttps://www.hathitrust.org/common/firebird/dist/fonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.hathitrust.org/common/firebird/dist/fonts/fa-solid-900.woff2 — 146.9 KiB — 549 ms — font-display: swaphttps://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-regular.woff2mulish-v12-cyrillic_cyr... https://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-regular.woff2 — 34.6 KiB — 388 ms — font-display: swaphttps://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-500italic.woff2mulish-v12-cyrillic_cyr... https://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-500italic.woff2 — 37.6 KiB — 275 ms — font-display: swaphttps://www.hathitrust.org/common/firebird/dist/fonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.hathitrust.org/common/firebird/dist/fonts/fa-regular-400.woff2 — 24.6 KiB — 215 ms — font-display: swap
mulish-v12-latin-500.woff2 woff2 swap
Size 11 KB
Load time 221 ms
Start 298 ms
Risk FOUT — text flashes from fallback to web font
mulish-v12-cyrillic_cyr... woff2 swap
Size 35 KB
Load time 220 ms
Start 495 ms
Risk FOUT — text flashes from fallback to web font
mulish-v12-cyrillic_cyr... woff2 swap
Size 35 KB
Load time 290 ms
Start 497 ms
Risk FOUT — text flashes from fallback to web font
mulish-v12-cyrillic_cyr... woff2 swap
Size 35 KB
Load time 229 ms
Start 497 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 147 KB
Load time 549 ms
Start 1.9 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
mulish-v12-cyrillic_cyr... woff2 swap
Size 35 KB
Load time 388 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
mulish-v12-cyrillic_cyr... woff2 swap
Size 38 KB
Load time 275 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 25 KB
Load time 215 ms
Start 1.9 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 ~73 KB and ~146 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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
54 requests over 3658ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.4 s LCP 4.8 shttps://hathitrust.org// https://hathitrust.org/ — 301 — 173 B — 12 ms — h3https://www.hathitrust.org/www.hathitrust.org/ https://www.hathitrust.org/ — 200 — 6.9 KiB — 266 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/fonts/mulish-v12-latin-500.woff2www.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/fonts/mulish-v12-latin-500.woff2 — 200 — 11.2 KiB — 221 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/fonts.min.css?ver=1712686017www.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/fonts.min.css?ver=1712686017 — 200 — 470 B — 14 ms — h3https://www.hathitrust.org/common/firebird/dist/assets/index-1ikxRTaC.css?ver=6.9www.hathitrust.org/common/firebird/... https://www.hathitrust.org/common/firebird/dist/assets/index-1ikxRTaC.css?ver=6.9 — 200 — 62.1 KiB — 26 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/dist/css/style.min.css?ver=1772042550www.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/dist/css/style.min.css?ver=1772042550 — 200 — 5.2 KiB — 20 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/dist/css/home.min.css?ver=1772042008www.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/dist/css/home.min.css?ver=1772042008 — 200 — 1.8 KiB — 17 ms — h3https://www.hathitrust.org/common/firebird/dist/assets/index-Bh9Bq4WN.js?ver=6.9www.hathitrust.org/common/firebird/... https://www.hathitrust.org/common/firebird/dist/assets/index-Bh9Bq4WN.js?ver=6.9 — 200 — 85.7 KiB — 555 ms — h3https://www.hathitrust.org/wp-content/uploads/2026/03/MAR26-HOME-PAGE-LG-.pngwww.hathitrust.org/wp-content/uploa... https://www.hathitrust.org/wp-content/uploads/2026/03/MAR26-HOME-PAGE-LG-.png — 200 — 857.1 KiB — 625 ms — h3https://www.hathitrust.org/wp-content/uploads/2024/03/GROUPS-Blog-SM-300X300-1.pngwww.hathitrust.org/wp-content/uploa... https://www.hathitrust.org/wp-content/uploads/2024/03/GROUPS-Blog-SM-300X300-1.png — 200 — 25.1 KiB — 237 ms — h3https://www.hathitrust.org/wp-content/uploads/2023/10/NEW300X300-HTRC-logo.pngwww.hathitrust.org/wp-content/uploa... https://www.hathitrust.org/wp-content/uploads/2023/10/NEW300X300-HTRC-logo.png — 200 — 31.7 KiB — 232 ms — h3https://www.hathitrust.org/wp-content/uploads/2024/03/PRESS-SV-release-300X300.pngwww.hathitrust.org/wp-content/uploa... https://www.hathitrust.org/wp-content/uploads/2024/03/PRESS-SV-release-300X300.png — 200 — 80.7 KiB — 331 ms — h3https://www.hathitrust.org/wp-content/uploads/2024/08/HOMEPAGE-0824-Help-Center-Image-700X400.pngwww.hathitrust.org/wp-content/uploa... https://www.hathitrust.org/wp-content/uploads/2024/08/HOMEPAGE-0824-Help-Center-Image-700X400.png — 200 — 132.9 KiB — 404 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/dist/js/scripts.min.js?ver=1772042550www.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/dist/js/scripts.min.js?ver=1772042550 — 200 — 2.2 KiB — 135 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/dist/js/cookies.min.js?ver=1772042550www.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/dist/js/cookies.min.js?ver=1772042550 — 200 — 1.1 KiB — 125 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/dist/js/highlight.min.js?ver=1772042550www.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/dist/js/highlight.min.js?ver=1772042550 — 200 — 10.9 KiB — 408 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/src/js/matomo.js?ver=1710196128www.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/src/js/matomo.js?ver=1710196128 — 200 — 549 B — 126 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/images/bg.svgwww.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/images/bg.svg — 200 — 1.1 KiB — 1.6 s — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/images/bghomeabout.svgwww.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/images/bghomeabout.svg — 200 — 1.1 KiB — 172 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/images/link-arrow-white.svgwww.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/images/link-arrow-white.svg — 200 — 477 B — 124 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/images/bghomepresentations.svgwww.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/images/bghomepresentations.svg — 200 — 639.9 KiB — 910 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/images/link-arrow.svgwww.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/images/link-arrow.svg — 200 — 479 B — 117 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/images/bg404mobile.svgwww.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/images/bg404mobile.svg — 200 — 632.7 KiB — 629 ms — h3https://www.hathitrust.org/wp-content/uploads/2026/03/MAR26-Homepage-SM-outdoor-meals.pngwww.hathitrust.org/wp-content/uploa... https://www.hathitrust.org/wp-content/uploads/2026/03/MAR26-Homepage-SM-outdoor-meals.png — 200 — 20.3 KiB — 577 ms — h3https://www.hathitrust.org/wp-content/uploads/2026/03/MAR26-Homepage-SM-Quaker.pngwww.hathitrust.org/wp-content/uploa... https://www.hathitrust.org/wp-content/uploads/2026/03/MAR26-Homepage-SM-Quaker.png — 200 — 20.1 KiB — 224 ms — h3https://www.hathitrust.org/wp-content/uploads/2026/03/MAR26-Homepage-SM-Aldine.pngwww.hathitrust.org/wp-content/uploa... https://www.hathitrust.org/wp-content/uploads/2026/03/MAR26-Homepage-SM-Aldine.png — 200 — 13.1 KiB — 141 ms — h3https://www.hathitrust.org/wp-content/uploads/2026/03/MAR26-Homepage-SM-Edwardians.pngwww.hathitrust.org/wp-content/uploa... https://www.hathitrust.org/wp-content/uploads/2026/03/MAR26-Homepage-SM-Edwardians.png — 200 — 10.3 KiB — 174 ms — h3https://www.hathitrust.org/wp-content/uploads/2025/11/NOV25-BLOG-3-X-2-RS-Nov-Update.pngwww.hathitrust.org/wp-content/uploa... https://www.hathitrust.org/wp-content/uploads/2025/11/NOV25-BLOG-3-X-2-RS-Nov-Update.png — 200 — 1.1 MiB — 2.2 s — h3https://www.hathitrust.org/wp-content/uploads/2026/03/MAR26-HOME-PAGE-LG-2-.pngwww.hathitrust.org/wp-content/uploa... https://www.hathitrust.org/wp-content/uploads/2026/03/MAR26-HOME-PAGE-LG-2-.png — 200 — 556.6 KiB — 794 ms — h3https://www.hathitrust.org/wp-content/uploads/2026/02/FEB26-Luv-Data.pngwww.hathitrust.org/wp-content/uploa... https://www.hathitrust.org/wp-content/uploads/2026/02/FEB26-Luv-Data.png — 200 — 291.4 KiB — 2.9 s — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.4 s LCP 4.8 shttps://hathitrust.org// https://hathitrust.org/ — 301 — 173 B — 12 ms — h3https://www.hathitrust.org/www.hathitrust.org/ https://www.hathitrust.org/ — 200 — 6.9 KiB — 266 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/fonts/mulish-v12-latin-500.woff2www.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/fonts/mulish-v12-latin-500.woff2 — 200 — 11.2 KiB — 221 ms — h3https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/fonts.min.css?ver=1712686017www.hathitrust.org/wp-content/theme... https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/fonts.min.css?ver=1712686017 — 200 — 470 B — 14 ms — h3https://www.hathitrust.org/common/firebird/dist/assets/index-1ikxRTaC.css?ver=6.9www.hathitrust.org/common/firebird/... https://www.hathitrust.org/common/firebird/dist/assets/index-1ikxRTaC.css?ver=6.9 — 200 — 62.1 KiB — 26 ms — 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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
100% of JavaScript execution is third-party
First-party Third-party 1055ms · 17KB · $14/mo
Unattributable
Other
Costly
Execution 354ms
Transfer 0 KB
Monthly Cost $5/mo
babel.hathitrust.org
Other
Costly
Execution 322ms
Transfer 9 KB
Monthly Cost $4/mo
www.hathitrust.org
Other
Costly
Execution 279ms
Transfer 7 KB
Monthly Cost $4/mo
www.hathitrust.org
Other
Optional
Execution 99ms
Transfer 0 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 354ms and costs ~$5/month
  • babel.hathitrust.org adds 322ms and costs ~$4/month
  • www.hathitrust.org adds 279ms and costs ~$4/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.

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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

Unattributable takes 354ms 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

babel.hathitrust.org takes 322ms 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.hathitrust.org 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

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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