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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
87
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.
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.

1.31 s

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

1.95 s

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

4 ms

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

0.028

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

1.31 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.

1.96 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 2 REVIEW 5 FIX
F
Page Weight Budget
Action
2.6 MB transferred, 57 requests
FIX
2.6 MB transferred, 57 requests
Warning::
Page weighs 5.5 MB (2.6 MB transferred)
Warning::
Images are 1.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.0 MB
Warning::
JavaScript is 851 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 851 KB
Info::
Fonts are 570 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 570 KB
Info::
CSS is 221 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 221 KB
Info::
57 HTTP requests
Info::
Estimated 0.55 g CO2 per page load
2.6 MB / 2.4 MB budget
2.6 MB transferred
57 requests
0.55 g CO2 per page load
Images 1.0 MiB 38%
JavaScript 851.2 KiB 31%
Fonts 569.8 KiB 21%
CSS 221.2 KiB 8%
HTML 23.0 KiB 1%
Other 1.1 KiB 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

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 (2.6 MiB of 2.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
19 scripts, 433 KB unused
FIX
19 scripts, 433 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-W7FL...: 86 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WVN...: 78 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-151...: 75 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-110...: 74 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://more.ebsco.com/js/forms2/js/forms2.min.js: 38 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 433 KB
433 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-W7FLZWNQJH&cx=c&gtm=4e64h1179 KB86 KB (48%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WVN26MP175 KB78 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-15167142&cx=c&gtm=4e64h1133 KB75 KB (57%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-11003708&cx=c&gtm=4e64h1129 KB74 KB (57%)✓3rd
https://more.ebsco.com/js/forms2/js/forms2.min.js0 KB38 KB (57%)✓3rd
https://more.ebsco.com/js/forms2/js/forms2.min.js67 KB38 KB (57%)✓3rd
https://about.ebsco.com/sites/default/files/js/js_VMuhqpulToRNEet1CaeWBp_WfYceUNoAv44jBwGswUw.js?scope=footer&delta=0&language=en&theme=cog_ebsco&include=eJyFkFsSwjAIRTdkzZIYmtKKpVAhPrp7o1ZH--Nf7jkwuUO2AaiNbIk6gQlZG8ULD1jYdJd_rF3IBZcNjYNdD9zRFnOhJkgoF_MvN4i1WHVZhOKLzyZLzyKAOZt3r9_FvLVbYuXyScAqrJQ2uXqn1Pl5RtnjEW8_oA4LzrFOsRZyrfh4OpMv-9582j1rwDQWg0dOm_zPg9NUDwRBEbU8ZLORad3ySO8H1LIjmPPAegdMBpY940 KB23 KB (57%)✓3rd
https://about.ebsco.com/sites/default/files/js/js_nM3YbPck75sqRSCCUVehryJ4SzimeKLDoWePX_mRkDg.js?scope=footer&delta=10&language=en&theme=cog_ebsco&include=eJyFkFsSwjAIRTdkzZIYmtKKpVAhPrp7o1ZH--Nf7jkwuUO2AaiNbIk6gQlZG8ULD1jYdJd_rF3IBZcNjYNdD9zRFnOhJkgoF_MvN4i1WHVZhOKLzyZLzyKAOZt3r9_FvLVbYuXyScAqrJQ2uXqn1Pl5RtnjEW8_oA4LzrFOsRZyrfh4OpMv-9582j1rwDQWg0dOm_zPg9NUDwRBEbU8ZLORad3ySO8H1LIjmPPAegdMBpY926 KB21 KB (79%)✓3rd
https://about.ebsco.com/themes/custom/cog_ebsco/ebsco_design_library/js/overlay.js?v=23 KB—✗3rd
https://about.ebsco.com/themes/custom/cog_ebsco/js/dist/main-navigation-24.js?v=2.316 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
57 resources · 2.6 MB · 433 KB savings available
FIX
57 resources · 2.6 MB · 433 KB savings available
Warning::
Page weight 1.6 MB over 1MB target
Got: 2.6 MB Expected: ≤ 1 MB
Info::
~433 KB of savings available
Warning::
56 third-party resources (100% of weight)
Info::
2 resources over 200KB
57 resources · 2.6 MiB · 56 third-party 1.6 MiB over 1MB target
Image 39% · 1.0 MiB
JavaScript 31% · 851.2 KiB
Font 21% · 569.8 KiB
CSS 8% · 221.2 KiB
Document 1% · 23.0 KiB
Other 0% · 230 B

~433.4 KiB of savings available

Remove unused JavaScript: 433.4 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
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://assets.ebsco.com/asset/28ee4931-2601-4c2b-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 1.0 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

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+
JS Execution Cost
435ms total JS execution
PASS
435ms total JS execution
Info::
https://about.ebsco.com/: 120ms CPU time
Info::
Unattributable: 102ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WVN...: 79ms CPU time
Info::
https://more.ebsco.com/js/forms2/js/forms2.min.js: 73ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-W7FL...: 61ms CPU time
Warning::
Third-party scripts: 435ms (100% of total)

Main Thread Breakdown

Script Evaluation 44% Other 21% Style & Layout 15% Script Parsing & Compilation 11% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
https://about.ebsco.com/120ms7ms1ms3rd
Unattributable102ms2ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WVN26MP79ms64ms13ms3rd
https://more.ebsco.com/js/forms2/js/forms2.min.js73ms56ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-W7FLZWNQJH&cx=c&gtm=4e64h161ms49ms12ms3rd
A+
Font Loading
6 fonts (570 KB)
PASS
6 fonts (570 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

570 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 2.0 shttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 39 ms — font-display: swaphttps://about.ebsco.com/themes/custom/cog_ebsco/ebsco_design_library/fontawesome/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://about.ebsco.com/themes/custom/cog_ebsco/ebsco_design_library/fontawesome/webfonts/fa-regular-400.woff2 — 170.7 KiB — 41 ms — font-display: swaphttps://about.ebsco.com/themes/custom/cog_ebsco/ebsco_design_library/fontawesome/webfonts/fa-light-300.woff2fa-light-300.woff2 https://about.ebsco.com/themes/custom/cog_ebsco/ebsco_design_library/fontawesome/webfonts/fa-light-300.woff2 — 186.4 KiB — 48 ms — font-display: swaphttps://about.ebsco.com/themes/custom/cog_ebsco/ebsco_design_library/font_notosans/fonts/noto-sans-v9-latin-700.woff2noto-sans-v9-latin-700.... https://about.ebsco.com/themes/custom/cog_ebsco/ebsco_design_library/font_notosans/fonts/noto-sans-v9-latin-700.woff2 — 16.2 KiB — 34 ms — font-display: swaphttps://about.ebsco.com/themes/custom/cog_ebsco/ebsco_design_library/font_notosans/fonts/noto-sans-v9-latin-regular.woff2noto-sans-v9-latin-regu... https://about.ebsco.com/themes/custom/cog_ebsco/ebsco_design_library/font_notosans/fonts/noto-sans-v9-latin-regular.woff2 — 15.9 KiB — 36 ms — font-display: swaphttps://about.ebsco.com/themes/custom/cog_ebsco/ebsco_design_library/fontawesome/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://about.ebsco.com/themes/custom/cog_ebsco/ebsco_design_library/fontawesome/webfonts/fa-solid-900.woff2 — 138.6 KiB — 10 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 39 ms
Start 175 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 171 KB
Load time 41 ms
Start 176 ms
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-light-300.woff2 woff2 swap
Size 186 KB
Load time 48 ms
Start 176 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
noto-sans-v9-latin-700.... woff2 swap
Size 16 KB
Load time 34 ms
Start 177 ms
Risk FOUT — text flashes from fallback to web font
noto-sans-v9-latin-regu... woff2 swap
Size 16 KB
Load time 36 ms
Start 177 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 139 KB
Load time 10 ms
Start 332 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~248 KB and ~496 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
57 requests over 640ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 2.0 shttps://ebscohost.com// https://ebscohost.com/ — 301 — 230 B — 7 ms — h2https://about.ebsco.com/about.ebsco.com/ https://about.ebsco.com/ — 200 — 22.2 KiB — 10 ms — h2https://about.ebsco.com/sites/default/files/css/css_yn38dGsOuZs00vGrPax_Eehp7yaxq4U083U6KWL6TJ4.css?delta=0&language=en&theme=cog_ebsco&include=eJxtkNFyhCAMRX9oKR1_iAmYRWogToi769_X-lIn-sg5SS5z49ZGFP9kqaCK8kicA8ae2ONIIa6q3G6hy8LrYtTfHXe7NHHFsEDGMHwPg5El7fcicZqNoNLm2yDizAZVKM01eJUMWi75_EIh2AztCJKmyB_LJ35PZUSLi6LrSJiUbVWK0FHc9da_wH5ST24Kb-x7L4aepzJxhD1YNzq2Bf0o6wL0BT_weRxDoc7KR_XevC_-HNq3rlh93H_3CyvayHcabout.ebsco.com/sites/default/files... https://about.ebsco.com/sites/default/files/css/css_yn38dGsOuZs00vGrPax_Eehp7yaxq4U083U6KWL6TJ4.css?delta=0&language=en&theme=cog_ebsco&include=eJxtkNFyhCAMRX9oKR1_iAmYRWogToi769_X-lIn-sg5SS5z49ZGFP9kqaCK8kicA8ae2ONIIa6q3G6hy8LrYtTfHXe7NHHFsEDGMHwPg5El7fcicZqNoNLm2yDizAZVKM01eJUMWi75_EIh2AztCJKmyB_LJ35PZUSLi6LrSJiUbVWK0FHc9da_wH5ST24Kb-x7L4aepzJxhD1YNzq2Bf0o6wL0BT_weRxDoc7KR_XevC_-HNq3rlh93H_3CyvayHc — 200 — 40.9 KiB — 27 ms — h2https://about.ebsco.com/sites/default/files/css/css_Gv6cvz3O_139Dg7sqBZg3qXelM5cOjXfx9wbaoEpHAI.css?delta=1&language=en&theme=cog_ebsco&include=eJxtkNFyhCAMRX9oKR1_iAmYRWogToi769_X-lIn-sg5SS5z49ZGFP9kqaCK8kicA8ae2ONIIa6q3G6hy8LrYtTfHXe7NHHFsEDGMHwPg5El7fcicZqNoNLm2yDizAZVKM01eJUMWi75_EIh2AztCJKmyB_LJ35PZUSLi6LrSJiUbVWK0FHc9da_wH5ST24Kb-x7L4aepzJxhD1YNzq2Bf0o6wL0BT_weRxDoc7KR_XevC_-HNq3rlh93H_3CyvayHcabout.ebsco.com/sites/default/files... https://about.ebsco.com/sites/default/files/css/css_Gv6cvz3O_139Dg7sqBZg3qXelM5cOjXfx9wbaoEpHAI.css?delta=1&language=en&theme=cog_ebsco&include=eJxtkNFyhCAMRX9oKR1_iAmYRWogToi769_X-lIn-sg5SS5z49ZGFP9kqaCK8kicA8ae2ONIIa6q3G6hy8LrYtTfHXe7NHHFsEDGMHwPg5El7fcicZqNoNLm2yDizAZVKM01eJUMWi75_EIh2AztCJKmyB_LJ35PZUSLi6LrSJiUbVWK0FHc9da_wH5ST24Kb-x7L4aepzJxhD1YNzq2Bf0o6wL0BT_weRxDoc7KR_XevC_-HNq3rlh93H_3CyvayHc — 200 — 9.6 KiB — 25 ms — h2https://fonts.googleapis.com/css?family=Open+Sans:300,400,700&display=swapfonts.googleapis.com/css?family=Ope... https://fonts.googleapis.com/css?family=Open+Sans:300,400,700&display=swap — 200 — 2.2 KiB — 82 ms — h2https://about.ebsco.com/sites/default/files/css/css_RDjqpIMVK23V6n-_Cnf961jnNtwxYBeCFaEJhORFzr0.css?delta=3&language=en&theme=cog_ebsco&include=eJxtkNFyhCAMRX9oKR1_iAmYRWogToi769_X-lIn-sg5SS5z49ZGFP9kqaCK8kicA8ae2ONIIa6q3G6hy8LrYtTfHXe7NHHFsEDGMHwPg5El7fcicZqNoNLm2yDizAZVKM01eJUMWi75_EIh2AztCJKmyB_LJ35PZUSLi6LrSJiUbVWK0FHc9da_wH5ST24Kb-x7L4aepzJxhD1YNzq2Bf0o6wL0BT_weRxDoc7KR_XevC_-HNq3rlh93H_3CyvayHcabout.ebsco.com/sites/default/files... https://about.ebsco.com/sites/default/files/css/css_RDjqpIMVK23V6n-_Cnf961jnNtwxYBeCFaEJhORFzr0.css?delta=3&language=en&theme=cog_ebsco&include=eJxtkNFyhCAMRX9oKR1_iAmYRWogToi769_X-lIn-sg5SS5z49ZGFP9kqaCK8kicA8ae2ONIIa6q3G6hy8LrYtTfHXe7NHHFsEDGMHwPg5El7fcicZqNoNLm2yDizAZVKM01eJUMWi75_EIh2AztCJKmyB_LJ35PZUSLi6LrSJiUbVWK0FHc9da_wH5ST24Kb-x7L4aepzJxhD1YNzq2Bf0o6wL0BT_weRxDoc7KR_XevC_-HNq3rlh93H_3CyvayHc — 200 — 164.7 KiB — 38 ms — h2https://more.ebsco.com/js/forms2/js/forms2.min.jsmore.ebsco.com/js/forms2/js/forms2.... 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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 435ms · 377KB · €5/mo
about.ebsco.com
Other
Optional
Execution 120ms
Transfer 22 KB
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 102ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 79ms
Transfer 175 KB
Unused 45%
Monthly Cost €1/mo
more.ebsco.com
Other
Optional
Execution 73ms
Transfer 0 KB
Unused 57%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 61ms
Transfer 179 KB
Unused 48%
Monthly Cost €1/mo

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

57% of more.ebsco.com'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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