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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
1
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
73
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

709 ms

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

4.16 s

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

9 ms

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

0.004

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

2.38 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.

4.37 s

Page Load Progression

534 ms
1.1 s
1.6 s
2.1 s
2.7 s
3.2 s
3.7 s
4.3 s
Checks
15
7 PASS 5 REVIEW 1 FIX
F
Page Weight Budget
Action
6.6 MB transferred, 113 requests
FIX
6.6 MB transferred, 113 requests
Critical::
Page weighs 7.5 MB (6.6 MB transferred)
Warning::
Images are 6.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 6.2 MB
Warning::
113 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.4 g CO2 per page load
6.6 MB / 2.4 MB budget
6.6 MB transferred
113 requests
1.4 g CO2 per page load
Images 6.2 MiB 94%
JavaScript 200.3 KiB 3%
CSS 108.7 KiB 2%
Fonts 85.2 KiB 1%
HTML 17.6 KiB 0%
Other 967 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

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

C
Image Optimization
Action
17 images, 0 KB saveable
REVIEW
17 images, 0 KB saveable
Warning::
https://libretexts.org/sites/default/files/2025-01... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://libretexts.org/sites/default/files/2025-01... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://libretexts.org/sites/default/files/2025-01... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://libretexts.org/sites/default/files/2024-10... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://libretexts.org/sites/default/files/default... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://libretexts.org/sites/default/files/2025-01... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://libretexts.org/sites/default/files/LibreTe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://libretexts.org/sites/default/files/2025-06... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://libretexts.org/sites/default/files/2025-08... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://libretexts.org/sites/default/files/2025-02... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
17 images 6.2 MB
0 oversized -0 KB
17 legacy format
10 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

C
JS Execution Cost
Action
1248ms total JS execution
REVIEW
1248ms total JS execution
Warning::
https://libretexts.org/: 517ms CPU time
Info::
https://libretexts.org/themes/custom/edu_care/asse...: 247ms CPU time
Info::
https://libretexts.org/core/assets/vendor/jquery/j...: 219ms CPU time
Info::
Unattributable: 153ms CPU time
Info::
https://libretexts.org/core/misc/drupal.init.js?v=...: 112ms CPU time
Info::
Third-party scripts: 153ms (12% of total)

Main Thread Breakdown

Other 42% Script Evaluation 22% Style & Layout 22% Rendering 6% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
https://libretexts.org/517ms3ms0ms1st
https://libretexts.org/themes/custom/edu_care/assets/vendor/js/purecounter/dist/purecounter_vanilla.js?v=10.4.6247ms186ms0ms1st
https://libretexts.org/core/assets/vendor/jquery/jquery.min.js?v=3.7.1219ms25ms5ms1st
Unattributable153ms4ms0ms3rd
https://libretexts.org/core/misc/drupal.init.js?v=10.4.6112ms56ms0ms1st
B
JS Bundles
22 scripts, 79 KB unused
REVIEW
22 scripts, 79 KB unused
Warning::
https://libretexts.org/themes/custom/edu_care/asse...: 33 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://libretexts.org/themes/custom/edu_care/asse...: 25 KB unused (85%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.addtoany.com/menu/modules/core.ydpp...: 21 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 79 KB
79 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://libretexts.org/themes/custom/edu_care/assets/vendor/js/swiper/swiper-bundle.min.js?v=10.4.639 KB33 KB (84%)✓1st
https://libretexts.org/themes/custom/edu_care/assets/vendor/js/fancy-box/fancybox.js?v=10.4.630 KB25 KB (85%)✓1st
https://static.addtoany.com/menu/modules/core.ydpp7jcu.js26 KB21 KB (82%)✓3rd
https://libretexts.org/themes/contrib/bootstrap_barrio/js/barrio.js?v=10.4.61 KB—✓1st
https://libretexts.org/libraries/bootstrap/dist/js/bootstrap.min.js?sz83xb17 KB—✓1st
https://libretexts.org/core/misc/drupalSettingsLoader.js?v=10.4.60 KB—✓1st
https://libretexts.org/core/misc/drupal.js?v=10.4.66 KB—✗1st
https://libretexts.org/core/misc/drupal.init.js?v=10.4.61 KB—✓1st
https://static.addtoany.com/menu/page.js2 KB—✓3rd
https://libretexts.org/modules/contrib/addtoany/js/addtoany.js?v=10.4.60 KB—✓1st

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

C
Page Weight Inventory
Action
113 resources · 6.6 MB · 79 KB savings available
REVIEW
113 resources · 6.6 MB · 79 KB savings available
Warning::
Page weight 5.6 MB over 1MB target
Got: 6.6 MB Expected: ≤ 1 MB
Info::
~79 KB of savings available
Info::
15 third-party resources (3% of weight)
Info::
7 resources over 200KB
113 resources · 6.6 MiB · 15 third-party 5.6 MiB over 1MB target
Image 94% · 6.2 MiB
JavaScript 3% · 200.3 KiB
CSS 2% · 108.7 KiB
Font 1% · 85.2 KiB
Document 0% · 17.6 KiB

~79.2 KiB of savings available

Remove unused JavaScript: 79.2 KiB
B
HTTP Caching
must-revalidate, no-cache, private
REVIEW
must-revalidate, no-cache, private
Info::
Cache-Control header is set
Got: must-revalidate, no-cache, private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

must-revalidate, no-cache, private

DirectiveValueMeaning
must-revalidate—Must recheck with server after expiry
no-cache—Cache but always revalidate first
private—Only browser cache, not CDN/proxy
A+
Third-Party Impact
3% third-party, 0 ms blocking
PASS
3% third-party, 0 ms blocking
Info::
Third-party code accounts for 3% of page weight (228.4 KiB of 6.6 MiB)
Info::
Third-party blocking time is low (0 ms)
97%
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
5 fonts (85 KB)
PASS
5 fonts (85 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

85 KB total

Render-blocking

0

of 5

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 FCP 709 ms LCP 4.2 shttps://fonts.gstatic.com/s/cabin/v26/u-4i0qWljRw-PfU81xCKCpdpbgZJl6Xvqdns.woff2u-4i0qWljRw-PfU81xCKCpd... https://fonts.gstatic.com/s/cabin/v26/u-4i0qWljRw-PfU81xCKCpdpbgZJl6Xvqdns.woff2 — 25.5 KiB — 9 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v30/KFOlCnqEu92Fr1MmEU9fBBc4.woff2KFOlCnqEu92Fr1MmEU9fBBc... https://fonts.gstatic.com/s/roboto/v30/KFOlCnqEu92Fr1MmEU9fBBc4.woff2 — 15.6 KiB — 9 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu4mxK.woff2KFOmCnqEu92Fr1Mu4mxK.woff2 https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu4mxK.woff2 — 15.4 KiB — 11 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVIUwaEQbjA.woff2memSYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVIUwaEQbjA.woff2 — 13.2 KiB — 25 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v30/KFOlCnqEu92Fr1MmWUlfBBc4.woff2KFOlCnqEu92Fr1MmWUlfBBc... https://fonts.gstatic.com/s/roboto/v30/KFOlCnqEu92Fr1MmWUlfBBc4.woff2 — 15.5 KiB — 17 ms — font-display: swap
u-4i0qWljRw-PfU81xCKCpd... woff2 swap
Size 26 KB
Load time 9 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
KFOlCnqEu92Fr1MmEU9fBBc... woff2 swap
Size 16 KB
Load time 9 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
KFOmCnqEu92Fr1Mu4mxK.woff2 woff2 swap
Size 15 KB
Load time 11 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
memSYaGs126MiZpBA-UvWbX... woff2 swap
Size 13 KB
Load time 25 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
KFOlCnqEu92Fr1MmWUlfBBc... woff2 swap
Size 16 KB
Load time 17 ms
Start 1.3 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)
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
113 requests over 1979ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 709 ms LCP 4.2 shttps://libretexts.org// https://libretexts.org/ — 200 — 16.6 KiB — 1.2 s — h2https://libretexts.org/core/modules/system/css/components/align.module.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/align.module.css?sz83xb — 200 — 285 B — 68 ms — h2https://libretexts.org/core/modules/system/css/components/fieldgroup.module.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/fieldgroup.module.css?sz83xb — 200 — 168 B — 64 ms — h2https://libretexts.org/core/modules/system/css/components/container-inline.module.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/container-inline.module.css?sz83xb — 200 — 259 B — 74 ms — h2https://libretexts.org/core/modules/system/css/components/clearfix.module.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/clearfix.module.css?sz83xb — 200 — 309 B — 69 ms — h2https://libretexts.org/core/modules/system/css/components/details.module.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/details.module.css?sz83xb — 200 — 204 B — 65 ms — h2https://libretexts.org/core/modules/system/css/components/hidden.module.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/hidden.module.css?sz83xb — 200 — 718 B — 69 ms — h2https://libretexts.org/core/modules/system/css/components/item-list.module.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/item-list.module.css?sz83xb — 200 — 359 B — 70 ms — h2https://libretexts.org/core/modules/system/css/components/js.module.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/js.module.css?sz83xb — 200 — 479 B — 49 ms — h2https://libretexts.org/core/modules/system/css/components/nowrap.module.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/nowrap.module.css?sz83xb — 200 — 193 B — 50 ms — h2https://libretexts.org/core/modules/system/css/components/position-container.module.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/position-container.module.css?sz83xb — 200 — 182 B — 51 ms — h2https://libretexts.org/core/modules/system/css/components/reset-appearance.module.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/reset-appearance.module.css?sz83xb — 200 — 257 B — 52 ms — h2https://libretexts.org/core/modules/system/css/components/resize.module.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/resize.module.css?sz83xb — 200 — 239 B — 53 ms — h2https://libretexts.org/core/modules/system/css/components/system-status-counter.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/system-status-counter.css?sz83xb — 200 — 374 B — 54 ms — h2https://libretexts.org/core/modules/system/css/components/system-status-report-counters.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/system-status-report-counters.css?sz83xb — 200 — 382 B — 55 ms — h2https://libretexts.org/core/modules/system/css/components/system-status-report-general-info.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/system-status-report-general-info.css?sz83xb — 200 — 244 B — 56 ms — h2https://libretexts.org/core/modules/system/css/components/tablesort.module.css?sz83xb/core/modules/system/css/components... https://libretexts.org/core/modules/system/css/components/tablesort.module.css?sz83xb — 200 — 292 B — 57 ms — h2https://libretexts.org/core/modules/views/css/views.module.css?sz83xb/core/modules/views/css/views.modul... https://libretexts.org/core/modules/views/css/views.module.css?sz83xb — 200 — 335 B — 121 ms — h2https://libretexts.org/modules/contrib/addtoany/css/addtoany.css?sz83xb/modules/contrib/addtoany/css/addto... https://libretexts.org/modules/contrib/addtoany/css/addtoany.css?sz83xb — 200 — 446 B — 69 ms — h2https://libretexts.org/modules/contrib/paragraphs/css/paragraphs.unpublished.css?sz83xb/modules/contrib/paragraphs/css/par... https://libretexts.org/modules/contrib/paragraphs/css/paragraphs.unpublished.css?sz83xb — 200 — 213 B — 70 ms — h2https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/variables.css?sz83xb/themes/contrib/bootstrap_barrio/cs... https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/variables.css?sz83xb — 200 — 249 B — 78 ms — h2https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/user.css?sz83xb/themes/contrib/bootstrap_barrio/cs... https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/user.css?sz83xb — 200 — 748 B — 89 ms — h2https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/progress.css?sz83xb/themes/contrib/bootstrap_barrio/cs... https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/progress.css?sz83xb — 200 — 179 B — 71 ms — h2https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/node.css?sz83xb/themes/contrib/bootstrap_barrio/cs... https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/node.css?sz83xb — 200 — 600 B — 82 ms — h2https://libretexts.org/themes/contrib/bootstrap_barrio/fonts/dosis_opensans.css?sz83xb/themes/contrib/bootstrap_barrio/fo... https://libretexts.org/themes/contrib/bootstrap_barrio/fonts/dosis_opensans.css?sz83xb — 200 — 194 B — 71 ms — h2https://fonts.googleapis.com/css?family=Open+Sans|Dosis:400,800fonts.googleapis.com/css?family=Ope... https://fonts.googleapis.com/css?family=Open+Sans|Dosis:400,800 — 200 — 2.1 KiB — 29 ms — h2https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/affix.css?sz83xb/themes/contrib/bootstrap_barrio/cs... https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/affix.css?sz83xb — 200 — 223 B — 123 ms — h2https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/book.css?sz83xb/themes/contrib/bootstrap_barrio/cs... https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/book.css?sz83xb — 200 — 219 B — 91 ms — h2https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/contextual.css?sz83xb/themes/contrib/bootstrap_barrio/cs... https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/contextual.css?sz83xb — 200 — 208 B — 82 ms — h2https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/feed-icon.css?sz83xb/themes/contrib/bootstrap_barrio/cs... https://libretexts.org/themes/contrib/bootstrap_barrio/css/components/feed-icon.css?sz83xb — 200 — 212 B — 75 ms — h2
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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
12% of JavaScript execution is third-party
First-party Third-party 153ms · 0KB · €2/mo
Unattributable
Other
Optional
Execution 153ms
Transfer 0 KB
Monthly Cost €2/mo

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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