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.
5.89 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
6.20 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.23 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.005
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.89 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.
17.46 s
Page Load Progression
DPage Weight BudgetAction2.4 MB transferred, 80 requestsFIX
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
FJS Execution CostAction3681ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://analytics.sagepub.com/gtm.js?id=GTM-5R9QN8 | 897ms | 788ms | 97ms | 3rd |
| https://www.sagepub.com/ | 609ms | 55ms | 35ms | 3rd |
| Unattributable | 541ms | 92ms | 0ms | 3rd |
| https://www.sagepub.com/sfrenderer/scripts/HawkSearch/vendor.bundle.js?assembly_name=CoreWeb.Sitefinity.Widgets&package_name=Global&version=921499994 | 371ms | 173ms | 188ms | 3rd |
| https://www.sagepub.com/sfrenderer/scripts/lazy-components.min.js | 331ms | 301ms | 0ms | 3rd |
| https://analytics.sagepub.com/gtag/js?id=G-60R758KFDG&cx=c>m=4e64f0&sign=082c0b0100ce487fdc5c640f52b689e40f00c944819aa6d6c0f51cc88f5120e4_20260416 | 273ms | 210ms | 61ms | 3rd |
| https://cdn-ukwest.onetrust.com/scripttemplates/202511.1.0/otBannerSdk.js | 214ms | 86ms | 40ms | 3rd |
| https://eu-assets.i.posthog.com/static/array.js | 168ms | 153ms | 13ms | 3rd |
| https://cdn.insight.sitefinity.com/sdk/sitefinity-insight-client.min.3.1.44.js | 93ms | 84ms | 3ms | 3rd |
| https://www.sagepub.com/global/styles/main.min.css?v=8yb5ornqfvaBydN8fMG4iATbZzA7PNDLDLVrPsO0eFc | 69ms | 0ms | 0ms | 3rd |
Showing top 10 of 12 scripts
FJS BundlesAction35 scripts, 621 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.sagepub.com/sfrenderer/scripts/HawkSearch/vendor.bundle.js?assembly_name=CoreWeb.Sitefinity.Widgets&package_name=Global&version=921499994 | 426 KB | 295 KB (69%) | ✓ | 3rd |
| https://cdn-ukwest.onetrust.com/scripttemplates/202511.1.0/otBannerSdk.js | 124 KB | 75 KB (60%) | ✓ | 3rd |
| https://analytics.sagepub.com/gtag/js?id=G-60R758KFDG&cx=c>m=4e64f0&sign=082c0b0100ce487fdc5c640f52b689e40f00c944819aa6d6c0f51cc88f5120e4_20260416 | 172 KB | 64 KB (38%) | ✓ | 3rd |
| https://cdnjs.cloudflare.com/ajax/libs/lottie-web/5.12.2/lottie.min.js | 63 KB | 54 KB (87%) | ✓ | 3rd |
| https://analytics.sagepub.com/gtm.js?id=GTM-5R9QN8 | 176 KB | 50 KB (28%) | ✓ | 3rd |
| https://eu-assets.i.posthog.com/static/array.js | 67 KB | 36 KB (54%) | ✓ | 3rd |
| https://eu-assets.i.posthog.com/static/surveys.js?v=1.369.0 | 32 KB | 25 KB (78%) | ✓ | 3rd |
| https://www.sagepub.com/sfrenderer/scripts/bootstrap.bundle.min.js?package_name=Global&version=-571980862 | 27 KB | 21 KB (81%) | ✓ | 3rd |
| https://www.sagepub.com/sfrenderer/scripts/HawkSearch/main.js?assembly_name=CoreWeb.Sitefinity.Widgets&package_name=Global&version=921499994 | 18 KB | — | ✗ | 3rd |
| https://www.sagepub.com/global/js/coreweb-design.js?v=u2-_bVlh3glW7GR3BaIQ_HlSlUNp7r5IWvmM0uQ_ymg | 12 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 InventoryAction80 resources · 2.4 MB · 621 KB savings availableFIX
~621.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 80 resources | 2.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization16 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 Loading9 fonts (448 KB)PASS
Web fonts
9
448 KB total
Render-blocking
0
of 9
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
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 ~64 KB and ~128 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall80 requests over 3235msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
analytics.sagepub.com analytics.sagepub.com | Other | 897ms | 176 KB | 28% | £5/mo | Costly |
www.sagepub.com www.sagepub.com | Other | 609ms | 22 KB | — | £3/mo | Costly |
Unattributable Unattributable | Other | 541ms | 0 KB | — | £3/mo | Costly |
www.sagepub.com www.sagepub.com | Other | 371ms | 426 KB | 69% | £2/mo | Costly |
www.sagepub.com www.sagepub.com | Other | 331ms | 1 KB | — | £2/mo | Costly |
analytics.sagepub.com analytics.sagepub.com | Other | 273ms | 172 KB | 38% | £1/mo | Costly |
cdn-ukwest.onetrust.com cdn-ukwest.onetrust.com | Other | 214ms | 124 KB | 60% | £1/mo | Costly |
eu-assets.i.posthog.com eu-assets.i.posthog.com | Other | 168ms | 67 KB | 54% | £1/mo | Optional |
cdn.insight.sitefinity.com cdn.insight.sitefinity.com | Other | 93ms | 11 KB | — | £0/mo | Optional |
www.sagepub.com www.sagepub.com | Other | 69ms | 243 KB | — | £0/mo | Optional |
cdnjs cdnjs.cloudflare.com | CDN | 60ms | 63 KB | 87% | £0/mo | Optional |
www.google.com www.google.com | Other | 53ms | 0 KB | — | £0/mo | Optional |
These scripts may cost more than they're worth
- analytics.sagepub.com adds 897ms and costs ~£5/month
- www.sagepub.com adds 609ms and costs ~£3/month
- Unattributable adds 541ms and costs ~£3/month
- www.sagepub.com adds 371ms and costs ~£2/month
- www.sagepub.com adds 331ms and costs ~£2/month
- analytics.sagepub.com adds 273ms and costs ~£1/month
- cdn-ukwest.onetrust.com adds 214ms and costs ~£1/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
analytics.sagepub.com takes 897ms 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
www.sagepub.com takes 609ms 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 541ms 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
www.sagepub.com takes 371ms 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
69% of www.sagepub.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
www.sagepub.com takes 331ms 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
analytics.sagepub.com takes 273ms 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
cdn-ukwest.onetrust.com takes 214ms 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
60% of cdn-ukwest.onetrust.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
54% of eu-assets.i.posthog.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
87% of cdnjs'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