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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
15
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.

4.91 s

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

12.59 s

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

1.44 s

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

0.487

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

5.67 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.

12.61 s

Page Load Progression

496 ms
992 ms
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
17
8 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
5.3 MB transferred, 49 requests
FIX
5.3 MB transferred, 49 requests
Critical::
Page weighs 7.0 MB (5.3 MB transferred)
Warning::
Images are 4.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.7 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::
49 HTTP requests
Info::
Estimated 1.1 g CO2 per page load
5.3 MB / 2.4 MB budget
5.3 MB transferred
49 requests
1.1 g CO2 per page load
Images 4.7 MiB 89%
Fonts 358.8 KiB 7%
JavaScript 178.5 KiB 3%
CSS 69.6 KiB 1%
HTML 6.9 KiB 0%
Other 2.0 KiB 0%
Other 866 B 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 (5.3 MiB of 5.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4063ms total JS execution
FIX
4063ms total JS execution
Warning::
https://babel.hathitrust.org/cgi/ping?callback=HT....: 1235ms CPU time
Warning::
https://www.hathitrust.org/: 1052ms CPU time
Warning::
Unattributable: 1050ms CPU time
Warning::
https://www.hathitrust.org/cdn-cgi/challenge-platf...: 488ms CPU time
Info::
https://matomo.www.hathitrust.org/js/container_JBg...: 130ms CPU time
Warning::
Third-party scripts: 4063ms (100% of total)

Main Thread Breakdown

Script Evaluation 27% Other 26% Parse HTML & CSS 23% Style & Layout 17% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://babel.hathitrust.org/cgi/ping?callback=HT.postPingCallback&_17768902368241235ms384ms12ms3rd
https://www.hathitrust.org/1052ms71ms4ms3rd
Unattributable1050ms27ms0ms3rd
https://www.hathitrust.org/cdn-cgi/challenge-platform/scripts/jsd/main.js488ms469ms4ms3rd
https://matomo.www.hathitrust.org/js/container_JBgjlXyE.js130ms91ms37ms3rd
https://www.hathitrust.org/wp-content/themes/wordpress-hathitrust/dist/js/highlight.min.js?ver=177204255058ms45ms7ms3rd
https://www.hathitrust.org/common/firebird/dist/assets/index-1ikxRTaC.css?ver=6.950ms0ms0ms3rd
D
Page Weight Inventory
Action
49 resources · 5.3 MB · 74 KB savings available
FIX
49 resources · 5.3 MB · 74 KB savings available
Warning::
Page weight 4.3 MB over 1MB target
Got: 5.3 MB Expected: ≤ 1 MB
Info::
~74 KB of savings available
Warning::
48 third-party resources (100% of weight)
Info::
6 resources over 200KB
49 resources · 5.3 MiB · 48 third-party 4.3 MiB over 1MB target
Image 89% · 4.7 MiB
Font 7% · 358.8 KiB
JavaScript 3% · 178.5 KiB
CSS 1% · 69.6 KiB
Document 0% · 6.9 KiB
Other 0% · 1.9 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
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Warning::
https://www.hathitrust.org/common/firebird/dist/ha... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 4.7 MB
0 oversized -0 KB
20 legacy format
1 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

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&_17768902368249 KB—✓3rd
https://www.hathitrust.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?13 KB—✓3rd
https://matomo.www.hathitrust.org/plugins/HeatmapSessionRecording/configs.php?idsite=1&trackerid=iM8Fdm&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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.9 s LCP 12.6 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 — 578 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 — 681 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 — 535 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 — 34.7 KiB — 449 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 — 784 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 — 797 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 — 521 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 — 1.3 s — font-display: swap
mulish-v12-latin-500.woff2 woff2 swap
Size 11 KB
Load time 578 ms
Start 291 ms
Risk FOUT — text flashes from fallback to web font
mulish-v12-cyrillic_cyr... woff2 swap
Size 35 KB
Load time 681 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
mulish-v12-cyrillic_cyr... woff2 swap
Size 35 KB
Load time 535 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
mulish-v12-cyrillic_cyr... woff2 swap
Size 35 KB
Load time 449 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 147 KB
Load time 784 ms
Start 2.6 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 797 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
mulish-v12-cyrillic_cyr... woff2 swap
Size 38 KB
Load time 521 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 25 KB
Load time 1.3 s
Start 2.6 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+
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
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
49 requests over 4301ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.9 s LCP 12.6 shttps://hathitrust.org// https://hathitrust.org/ — 301 — 173 B — 15 ms — h3https://www.hathitrust.org/www.hathitrust.org/ https://www.hathitrust.org/ — 200 — 6.9 KiB — 248 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 — 578 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 — 28 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 — 23 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 — 26 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 — 85.8 KiB — 767 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 — 1.4 s — 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 — 454 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 — 453 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 — 1.1 s — 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 — 1.0 s — 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 — 349 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 — 526 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 — 770 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 — 344 ms — h3https://matomo.www.hathitrust.org/js/container_JBgjlXyE.jsmatomo.www.hathitrust.org/js/contai... https://matomo.www.hathitrust.org/js/container_JBgjlXyE.js — 200 — 55.7 KiB — 589 ms — 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 — 426 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 — 742 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 — 1.2 s — 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 — 1.4 s — h3https://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-500.woff2www.hathitrust.org/common/firebird/... https://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-500.woff2 — 200 — 34.7 KiB — 681 ms — h3https://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-700.woff2www.hathitrust.org/common/firebird/... https://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-700.woff2 — 200 — 34.5 KiB — 535 ms — h3https://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-800.woff2www.hathitrust.org/common/firebird/... https://www.hathitrust.org/common/firebird/dist/fonts/mulish-v12-cyrillic_cyrillic-ext_latin_latin-ext_vietnamese-800.woff2 — 200 — 34.7 KiB — 449 ms — h3https://babel.hathitrust.org/cgi/ping?callback=HT.postPingCallback&_1776890236824babel.hathitrust.org/cgi/ping?callb... https://babel.hathitrust.org/cgi/ping?callback=HT.postPingCallback&_1776890236824 — 200 — 9.2 KiB — 994 ms — h3https://www.hathitrust.org/cdn-cgi/challenge-platform/scripts/jsd/main.jswww.hathitrust.org/cdn-cgi/challeng... https://www.hathitrust.org/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 452 B — 5 ms — h3https://www.hathitrust.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?www.hathitrust.org/cdn-cgi/challeng... https://www.hathitrust.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? — 200 — 13.0 KiB — 9 ms — h3https://www.hathitrust.org/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.26267945896456757:1776888748:d8ZJUSqLLzxkOsprZnYwJCPyd_cwcfeIlxdsgOjd-T0/9f076ce4eaf53291www.hathitrust.org/cdn-cgi/challeng... https://www.hathitrust.org/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.26267945896456757:1776888748:d8ZJUSqLLzxkOsprZnYwJCPyd_cwcfeIlxdsgOjd-T0/9f076ce4eaf53291 — 200 — 866 B — 10 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 — 780 ms — h3
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.9 s LCP 12.6 shttps://hathitrust.org// https://hathitrust.org/ — 301 — 173 B — 15 ms — h3https://www.hathitrust.org/www.hathitrust.org/ https://www.hathitrust.org/ — 200 — 6.9 KiB — 248 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 — 578 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 — 28 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 4063ms · 145KB · $54/mo
babel.hathitrust.org
Other
Costly
Execution 1235ms
Transfer 9 KB
Monthly Cost $16/mo
www.hathitrust.org
Other
Costly
Execution 1052ms
Transfer 7 KB
Monthly Cost $14/mo
Unattributable
Other
Costly
Execution 1050ms
Transfer 0 KB
Monthly Cost $14/mo
www.hathitrust.org
Other
Costly
Execution 488ms
Transfer 0 KB
Monthly Cost $6/mo
Matomo
Analytics
Optional
Execution 130ms
Transfer 56 KB
Unused 53%
Monthly Cost $2/mo
www.hathitrust.org
Other
Optional
Execution 58ms
Transfer 11 KB
Monthly Cost $1/mo
www.hathitrust.org
Other
Optional
Execution 50ms
Transfer 62 KB
Monthly Cost $1/mo

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  • babel.hathitrust.org adds 1235ms and costs ~$16/month
  • www.hathitrust.org adds 1052ms and costs ~$14/month
  • Unattributable adds 1050ms and costs ~$14/month
  • www.hathitrust.org adds 488ms and costs ~$6/month

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

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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.

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babel.hathitrust.org takes 1235ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

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

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www.hathitrust.org takes 1052ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

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

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Unattributable takes 1050ms 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.

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www.hathitrust.org takes 488ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

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53% of Matomo'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.

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