Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
3.32 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.82 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
458 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.223
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.49 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.
12.43 s
Page Load Progression
DPage Weight BudgetAction2.5 MB transferred, 56 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
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.
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.
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.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2015ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://about.ebsco.com/ | 418ms | 33ms | 3ms | 3rd |
| Unattributable | 362ms | 7ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WVN26MP | 337ms | 275ms | 52ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-W7FLZWNQJH&cx=c>m=4e64h1 | 224ms | 179ms | 43ms | 3rd |
| https://more.ebsco.com/js/forms2/js/forms2.min.js | 224ms | 167ms | 30ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-15167142&cx=c>m=4e64h1 | 129ms | 98ms | 30ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-11003708&cx=c>m=4e64h1 | 116ms | 87ms | 28ms | 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_zPg9NUDwRBEbU8ZLORad3ySO8H1LIjmPPAegdMBpY9 | 116ms | 101ms | 8ms | 3rd |
| 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 | 90ms | 0ms | 0ms | 3rd |
DJS BundlesAction19 scripts, 433 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-W7FLZWNQJH&cx=c>m=4e64h1 | 179 KB | 86 KB (48%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WVN26MP | 175 KB | 78 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-15167142&cx=c>m=4e64h1 | 133 KB | 75 KB (56%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-11003708&cx=c>m=4e64h1 | 129 KB | 74 KB (57%) | ✓ | 3rd |
| https://more.ebsco.com/js/forms2/js/forms2.min.js | 0 KB | 38 KB (57%) | ✓ | 3rd |
| https://more.ebsco.com/js/forms2/js/forms2.min.js | 67 KB | 38 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_zPg9NUDwRBEbU8ZLORad3ySO8H1LIjmPPAegdMBpY9 | 40 KB | 23 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_zPg9NUDwRBEbU8ZLORad3ySO8H1LIjmPPAegdMBpY9 | 26 KB | 21 KB (79%) | ✓ | 3rd |
| https://about.ebsco.com/themes/custom/cog_ebsco/ebsco_design_library/js/overlay.js?v=2 | 3 KB | — | ✗ | 3rd |
| https://about.ebsco.com/themes/custom/cog_ebsco/js/dist/main-navigation-24.js?v=2.3 | 16 KB | — | ✗ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction56 resources · 2.5 MB · 433 KB savings availableFIX
~433.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 56 resources | 2.5 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization22 images, 0 KB saveableREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (431 KB)PASS
Web fonts
5
431 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- 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 ~179 KB and ~358 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints2 hints, 0 missing preconnectsPASS
Current Resource Hints
2 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall56 requests over 1178msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
about.ebsco.com about.ebsco.com | Other | 418ms | 22 KB | — | €5/mo | Costly |
Unattributable Unattributable | Other | 362ms | 0 KB | — | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 337ms | 175 KB | 45% | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 224ms | 179 KB | 48% | €2/mo | Costly |
more.ebsco.com more.ebsco.com | Other | 224ms | 0 KB | 57% | €2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 129ms | 133 KB | 56% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 116ms | 129 KB | 57% | €1/mo | Optional |
about.ebsco.com about.ebsco.com | Other | 116ms | 40 KB | 57% | €1/mo | Optional |
about.ebsco.com about.ebsco.com | Other | 90ms | 165 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- about.ebsco.com adds 418ms and costs ~€5/month
- Unattributable adds 362ms and costs ~€4/month
- Google Tag Manager adds 337ms and costs ~€4/month
- Google Tag Manager adds 224ms and costs ~€2/month
- more.ebsco.com adds 224ms and costs ~€2/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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
about.ebsco.com takes 418ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 362ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 337ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 224ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
more.ebsco.com takes 224ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
57% of more.ebsco.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
56% of Google Tag Manager's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
57% of Google Tag Manager's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
57% of about.ebsco.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev