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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
81
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.
73
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.

1.72 s

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

1.85 s

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

98 ms

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

0.007

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

2.05 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.

3.90 s

Page Load Progression

660 ms
1.3 s
2.0 s
2.6 s
3.3 s
4.0 s
4.6 s
5.3 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.9 MB transferred, 114 requests
FIX
3.9 MB transferred, 114 requests
Critical::
Page weighs 9.4 MB (3.9 MB transferred)
Warning::
JavaScript is 1.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.6 MB
Info::
CSS is 210 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 210 KB
Warning::
114 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.82 g CO2 per page load
3.9 MB / 2.4 MB budget
3.9 MB transferred
114 requests
0.82 g CO2 per page load
JavaScript 1.6 MiB 40%
Other 1.5 MiB 39%
Images 498.3 KiB 12%
CSS 210.5 KiB 5%
HTML 71.7 KiB 2%
Fonts 26.7 KiB 1%
Other 11.2 KiB 0%
Other 6.7 KiB 0%
Other 2.5 KiB 0%
Other 2.4 KiB 0%
Other 226 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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

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 (3.9 MiB of 3.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
50 scripts, 569 KB unused
FIX
50 scripts, 569 KB unused
Warning::
https://www.pearson.com/etc/clientlibs/one-dot-com...: 243 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-K8MH...: 68 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5D4...: 64 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MVH...: 64 KB unused (31%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.pearson.com/etc/clientlibs/platform/ae...: 59 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 569 KB
569 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.pearson.com/etc/clientlibs/one-dot-com/one-dot-com/he-ies-signin-modal.min.ACSHASHbbbeed361f6a3943648e4c2690317e1d.js297 KB243 KB (82%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-K8MHCWK5EH&cx=c&gtm=4e64k0h2170 KB68 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5D4Z3ML&gtm=4e64k0h2124 KB64 KB (52%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MVH69VF206 KB64 KB (31%)✓3rd
https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/jquery-ui-1-13-2.min.ACSHASH1e2047978946a1d271356d0b557a84a3.js68 KB59 KB (89%)✓3rd
https://www.pearson.com/6IgwutlUKWWSfwYMfG83AGqFezI/5ww7N8VLVJw6Nzk3aO/fXI2UUA/I3Ny/NgYGMDkB181 KB39 KB (22%)✓3rd
https://www.pearson.com/etc/clientlibs/platform/aem-core/components.min.ACSHASH472a1ff471c32c3727b9d2d02050b416.js50 KB32 KB (67%)✓3rd
https://www.pearson.com/etc/clientlibs/one-dot-com/one-dot-com/evolution-column-control-collapse.min.ACSHASHedfe505c62d117a26f847348e9799da0.js3 KB—✓3rd
https://k244.pearson.com/script.js0 KB—✓3rd
https://www.pearson.com/etc.clientlibs/cq/personalization/clientlib/underscore.min.ACSHASHbb50e8989e1105edfefd521e5fc3662c.js9 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
114 resources · 3.9 MB · 569 KB savings available
FIX
114 resources · 3.9 MB · 569 KB savings available
Warning::
Page weight 2.9 MB over 1MB target
Got: 3.9 MB Expected: ≤ 1 MB
Info::
~569 KB of savings available
Warning::
113 third-party resources (100% of weight)
Info::
3 resources over 200KB
114 resources · 3.9 MiB · 113 third-party 2.9 MiB over 1MB target
JavaScript 40% · 1.6 MiB
Media 39% · 1.5 MiB
Image 13% · 502.6 KiB
CSS 5% · 210.5 KiB
Document 2% · 72.8 KiB
Font 1% · 26.7 KiB
Other 0% · 17.6 KiB

~568.7 KiB of savings available

Remove unused JavaScript: 568.7 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.

C
Image Optimization
Action
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Warning::
https://www.pearson.com/content/dam/global/shared/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pearson.com/content/dam/global/shared/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pearson.com/content/dam/global/shared/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pearson.com/content/dam/global/shared/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pearson.com/content/dam/global/shared/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.pearson.com/content/dam/global/shared/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 498 KB
0 oversized -0 KB
7 legacy format
6 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

C
JS Execution Cost
Action
1488ms total JS execution
REVIEW
1488ms total JS execution
Warning::
https://www.pearson.com/: 507ms CPU time
Info::
Unattributable: 182ms CPU time
Info::
https://www.pearson.com/6IgwutlUKWWSfwYMfG83AGqFez...: 155ms CPU time
Info::
https://www.pearson.com/assets/386f225e49167f794e2...: 146ms CPU time
Info::
https://www.pearson.com/etc/cloudservices/geolocat...: 142ms CPU time
Warning::
Third-party scripts: 1488ms (100% of total)

Main Thread Breakdown

Script Evaluation 64% Other 15% Style & Layout 11% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.pearson.com/507ms210ms5ms3rd
Unattributable182ms17ms0ms3rd
https://www.pearson.com/6IgwutlUKWWSfwYMfG83AGqFezI/5ww7N8VLVJw6Nzk3aO/fXI2UUA/I3Ny/NgYGMDkB155ms130ms11ms3rd
https://www.pearson.com/assets/386f225e49167f794e266452faa1fa11422373f0727146ms119ms7ms3rd
https://www.pearson.com/etc/cloudservices/geolocation/global-store/_jcr_content/geolocation-context.initScript.js142ms141ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MVH69VF129ms105ms18ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5D4Z3ML&gtm=4e64k0h291ms82ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-K8MHCWK5EH&cx=c&gtm=4e64k0h273ms58ms15ms3rd
https://www.pearson.com/etc/clientlibs/one-dot-com/one-dot-com/he-ies-signin-modal.min.ACSHASHbbbeed361f6a3943648e4c2690317e1d.js63ms33ms26ms3rd
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+
Font Loading
1 fonts (27 KB)
PASS
1 fonts (27 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

27 KB total

Render-blocking

0

of 1

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 FCP 1.7 s LCP 1.9 shttps://fonts.gstatic.com/s/plusjakartasans/v12/LDIoaomQNQcsA88c7O9yZ4KMCoOg4Ko20yygg_vb.woff2LDIoaomQNQcsA88c7O9yZ4K... https://fonts.gstatic.com/s/plusjakartasans/v12/LDIoaomQNQcsA88c7O9yZ4KMCoOg4Ko20yygg_vb.woff2 — 26.7 KiB — 31 ms — font-display: swap
LDIoaomQNQcsA88c7O9yZ4K... woff2 swap
Size 27 KB
Load time 31 ms
Start 1.1 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
Network Waterfall
114 requests over 3398ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.7 s LCP 1.9 shttps://pearson.com// https://pearson.com/ — 301 — 246 B — 113 ms — http/1.1https://www.pearson.com/www.pearson.com/ https://www.pearson.com/ — 200 — 43.1 KiB — 190 ms — h2https://www.pearson.com/etc/clientlibs/one-dot-com/one-dot-com/master-tokens/evolution/css/tokens.csswww.pearson.com/etc/clientlibs/one-... https://www.pearson.com/etc/clientlibs/one-dot-com/one-dot-com/master-tokens/evolution/css/tokens.css — 200 — 3.8 KiB — 59 ms — h2https://www.pearson.com/etc/clientlibs/one-dot-com/one-dot-com/evolution-tokens/css/evolution-tokens.csswww.pearson.com/etc/clientlibs/one-... https://www.pearson.com/etc/clientlibs/one-dot-com/one-dot-com/evolution-tokens/css/evolution-tokens.css — 200 — 2.5 KiB — 61 ms — h2https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,200..800;1,200..800fonts.googleapis.com/css2?family=Pl... https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,200..800;1,200..800 — 200 — 1.0 KiB — 118 ms — h2https://www.pearson.com/assets/386f225e49167f794e266452faa1fa11422373f0727www.pearson.com/assets/386f225e4916... https://www.pearson.com/assets/386f225e49167f794e266452faa1fa11422373f0727 — 200 — 67.4 KiB — 118 ms — h2https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/jquery-3-6-0.min.ACSHASHf7f88c154f8dde28b5bcdd9e1c79f655.jswww.pearson.com/etc/clientlibs/plat... https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/jquery-3-6-0.min.ACSHASHf7f88c154f8dde28b5bcdd9e1c79f655.js — 200 — 32.3 KiB — 102 ms — h2https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/jquery-ui-1-13-2.min.ACSHASH1e2047978946a1d271356d0b557a84a3.jswww.pearson.com/etc/clientlibs/plat... https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/jquery-ui-1-13-2.min.ACSHASH1e2047978946a1d271356d0b557a84a3.js — 200 — 68.1 KiB — 141 ms — h2https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/picturefill.min.ACSHASHe22d1de6aa249e6152023448a4a570bf.jswww.pearson.com/etc/clientlibs/plat... https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/picturefill.min.ACSHASHe22d1de6aa249e6152023448a4a570bf.js — 200 — 4.2 KiB — 104 ms — h2https://www.pearson.com/etc/clientlibs/platform/aem-core/form-validator.min.ACSHASHfcecdec41515b061eeb5675ae01ce659.jswww.pearson.com/etc/clientlibs/plat... https://www.pearson.com/etc/clientlibs/platform/aem-core/form-validator.min.ACSHASHfcecdec41515b061eeb5675ae01ce659.js — 200 — 3.5 KiB — 106 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 189 ms — https://k244.pearson.com/script.jsk244.pearson.com/script.js https://k244.pearson.com/script.js — -1 — 0 B — 189 ms — https://bc-sbx1.pearson.com/script.jsbc-sbx1.pearson.com/script.js https://bc-sbx1.pearson.com/script.js — -1 — 0 B — 189 ms — https://www.pearson.com/etc.clientlibs/clientlibs/granite/lodash/modern.min.ACSHASH33a4fd73add344eacab89d99c11dcf3a.jswww.pearson.com/etc.clientlibs/clie... https://www.pearson.com/etc.clientlibs/clientlibs/granite/lodash/modern.min.ACSHASH33a4fd73add344eacab89d99c11dcf3a.js — 200 — 12.0 KiB — 107 ms — h2https://www.pearson.com/etc.clientlibs/cq/personalization/clientlib/underscore.min.ACSHASHbb50e8989e1105edfefd521e5fc3662c.jswww.pearson.com/etc.clientlibs/cq/p... https://www.pearson.com/etc.clientlibs/cq/personalization/clientlib/underscore.min.ACSHASHbb50e8989e1105edfefd521e5fc3662c.js — 200 — 8.9 KiB — 106 ms — h2https://www.pearson.com/etc.clientlibs/clientlibs/granite/backbone.min.ACSHASHe590febe6539b40e39ec9c983d8e96c0.jswww.pearson.com/etc.clientlibs/clie... https://www.pearson.com/etc.clientlibs/clientlibs/granite/backbone.min.ACSHASHe590febe6539b40e39ec9c983d8e96c0.js — 200 — 8.5 KiB — 108 ms — h2https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/template-settings.min.ACSHASH6e38b7e6a576e04396c34830c83f30fc.jswww.pearson.com/etc/clientlibs/plat... https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/template-settings.min.ACSHASH6e38b7e6a576e04396c34830c83f30fc.js — 200 — 2.0 KiB — 110 ms — h2https://www.pearson.com/etc/clientlibs/platform/aem-core/components.min.ACSHASH472a1ff471c32c3727b9d2d02050b416.jswww.pearson.com/etc/clientlibs/plat... https://www.pearson.com/etc/clientlibs/platform/aem-core/components.min.ACSHASH472a1ff471c32c3727b9d2d02050b416.js — 200 — 49.9 KiB — 137 ms — h2https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/bootstrap-4-3-1.min.ACSHASHcb8bf3d1be0523e7c0bd6ce9a1c7a388.jswww.pearson.com/etc/clientlibs/plat... https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/bootstrap-4-3-1.min.ACSHASHcb8bf3d1be0523e7c0bd6ce9a1c7a388.js — 200 — 23.5 KiB — 122 ms — h2https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/parsley-2-8.min.ACSHASH556fd9ab479352b3d4b9e80b17f0b476.jswww.pearson.com/etc/clientlibs/plat... https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/parsley-2-8.min.ACSHASH556fd9ab479352b3d4b9e80b17f0b476.js — 200 — 13.9 KiB — 122 ms — h2https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/bootstrap-4-3-1.min.ACSHASHcf4d74070a73cdb86117b5ecea837a56.csswww.pearson.com/etc/clientlibs/plat... https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/bootstrap-4-3-1.min.ACSHASHcf4d74070a73cdb86117b5ecea837a56.css — 200 — 26.0 KiB — 60 ms — h2https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/font-awesome-4-2.min.ACSHASHbd12c3d96f5473480f04fb430338d21c.csswww.pearson.com/etc/clientlibs/plat... https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/font-awesome-4-2.min.ACSHASHbd12c3d96f5473480f04fb430338d21c.css — 200 — 6.7 KiB — 60 ms — h2https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/parsley-2-8.min.ACSHASHca334e633e206e73cb76e8ce5f18875f.csswww.pearson.com/etc/clientlibs/plat... https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/parsley-2-8.min.ACSHASHca334e633e206e73cb76e8ce5f18875f.css — 200 — 1.9 KiB — 61 ms — h2https://www.pearson.com/etc/clientlibs/platform/aem-core/components/content/static-collection.min.ACSHASHd8d236ca379e8a2f4fda3e67ba9e1224.csswww.pearson.com/etc/clientlibs/plat... https://www.pearson.com/etc/clientlibs/platform/aem-core/components/content/static-collection.min.ACSHASHd8d236ca379e8a2f4fda3e67ba9e1224.css — 200 — 3.1 KiB — 112 ms — h2https://www.pearson.com/etc/clientlibs/platform/aem-core/components/content/video-common.min.ACSHASHcb44d5186cff54049f163ddbd3fe68d6.csswww.pearson.com/etc/clientlibs/plat... https://www.pearson.com/etc/clientlibs/platform/aem-core/components/content/video-common.min.ACSHASHcb44d5186cff54049f163ddbd3fe68d6.css — 200 — 2.5 KiB 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200 — 408 B — 472 ms — http/1.1https://bam.nr-data.net/jserrors/1/25fdf476ee?a=774664011&v=1.313.1&to=NVFSZkoAChJSWkFeDAwbY0JKCAoGcFZbQxENWFxXSk4IDlRQWxgLFllcHU5TSwJbXFZcMAdHQ1tXDyITUlRQGQsWWVwSECYhNRo%3D&rst=1394&ck=0&s=9e26186b74100263&ref=https://login.pearson.com/v1/piapi/login/html/v2/checkSessionFrame.html&ptid=3557c7815fbb7b49bam.nr-data.net/jserrors/1/25fdf476... https://bam.nr-data.net/jserrors/1/25fdf476ee?a=774664011&v=1.313.1&to=NVFSZkoAChJSWkFeDAwbY0JKCAoGcFZbQxENWFxXSk4IDlRQWxgLFllcHU5TSwJbXFZcMAdHQ1tXDyITUlRQGQsWWVwSECYhNRo%3D&rst=1394&ck=0&s=9e26186b74100263&ref=https://login.pearson.com/v1/piapi/login/html/v2/checkSessionFrame.html&ptid=3557c7815fbb7b49 — 200 — 408 B — 120 ms — http/1.1https://bam.nr-data.net/events/1/25fdf476ee?a=774664011&v=1.313.1&to=NVFSZkoAChJSWkFeDAwbY0JKCAoGcFZbQxENWFxXSk4IDlRQWxgLFllcHU5TSwJbXFZcMAdHQ1tXDyITUlRQGQsWWVwSECYhNRo%3D&rst=1395&ck=0&s=9e26186b74100263&ref=https://login.pearson.com/v1/piapi/login/html/v2/checkSessionFrame.html&ptid=3557c7815fbb7b49bam.nr-data.net/events/1/25fdf476ee... https://bam.nr-data.net/events/1/25fdf476ee?a=774664011&v=1.313.1&to=NVFSZkoAChJSWkFeDAwbY0JKCAoGcFZbQxENWFxXSk4IDlRQWxgLFllcHU5TSwJbXFZcMAdHQ1tXDyITUlRQGQsWWVwSECYhNRo%3D&rst=1395&ck=0&s=9e26186b74100263&ref=https://login.pearson.com/v1/piapi/login/html/v2/checkSessionFrame.html&ptid=3557c7815fbb7b49 — 200 — 408 B — 492 ms — http/1.1https://bam.nr-data.net/events/1/25fdf476ee?a=774664011&v=1.313.1&to=NVFSZkoAChJSWkFeDAwbY0JKCAoGcFZbQxENWFxXSk4IDlRQWxgLFllcHU5TSwJbXFZcMAdHQ1tXDyITUlRQGQsWWVwSECYhNRo%3D&rst=1397&ck=0&s=9e26186b74100263&ref=https://login.pearson.com/v1/piapi/login/html/v2/checkSessionFrame.html&ptid=3557c7815fbb7b49bam.nr-data.net/events/1/25fdf476ee... https://bam.nr-data.net/events/1/25fdf476ee?a=774664011&v=1.313.1&to=NVFSZkoAChJSWkFeDAwbY0JKCAoGcFZbQxENWFxXSk4IDlRQWxgLFllcHU5TSwJbXFZcMAdHQ1tXDyITUlRQGQsWWVwSECYhNRo%3D&rst=1397&ck=0&s=9e26186b74100263&ref=https://login.pearson.com/v1/piapi/login/html/v2/checkSessionFrame.html&ptid=3557c7815fbb7b49 — 200 — 408 B — 758 ms — http/1.1blob:https://www.pearson.com/f55a37b5-2197-4fef-90d1-568360f35515www.pearson.com/f55a37b5-2197-4fef-... blob:https://www.pearson.com/f55a37b5-2197-4fef-90d1-568360f35515 — -1 — 0 B — 0 ms — https://region1.google-analytics.com/g/collect?v=2&tid=G-K8MHCWK5EH&gtm=45je64k0h2v873843660z8812135862za20gzb812135862zd812135862&_p=1776810448086&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&are=1&cid=1898925735.1776810450&frm=0&pscdl=denied&rcb=8&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938469~117266401~117384406~118167059&dl=https%3A%2F%2Fwww.pearson.com%2F&dr=&sid=1776810449&sct=1&seg=0&dt=Pearson%20%7C%20The%20World%27s%20Leading%20Education%20Provider&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.page_category=default&ep.site_locale=&ep.site_label=unrecognised&ep.anchor_tag=&ep.section_label=&ep.tag_identifier=GA4%20page_view&tfd=2584region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-K8MHCWK5EH&gtm=45je64k0h2v873843660z8812135862za20gzb812135862zd812135862&_p=1776810448086&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&are=1&cid=1898925735.1776810450&frm=0&pscdl=denied&rcb=8&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938469~117266401~117384406~118167059&dl=https%3A%2F%2Fwww.pearson.com%2F&dr=&sid=1776810449&sct=1&seg=0&dt=Pearson%20%7C%20The%20World%27s%20Leading%20Education%20Provider&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.page_category=default&ep.site_locale=&ep.site_label=unrecognised&ep.anchor_tag=&ep.section_label=&ep.tag_identifier=GA4%20page_view&tfd=2584 — 204 — 549 B — 81 ms — h2https://bam.nr-data.net/events/1/068b3faa02?a=1120248489&sa=1&v=1.246.1&t=Unnamed%20Transaction&rst=2592&ck=0&s=0808916b4a357c1f&ref=https://www.pearson.com/bam.nr-data.net/events/1/068b3faa02... https://bam.nr-data.net/events/1/068b3faa02?a=1120248489&sa=1&v=1.246.1&t=Unnamed%20Transaction&rst=2592&ck=0&s=0808916b4a357c1f&ref=https://www.pearson.com/ — 200 — 406 B — 120 ms — http/1.1https://www.pearson.com/6IgwutlUKWWSfwYMfG83AGqFezI/5ww7N8VLVJw6Nzk3aO/fXI2UUA/I3Ny/NgYGMDkBwww.pearson.com/6IgwutlUKWWSfwYMfG8... https://www.pearson.com/6IgwutlUKWWSfwYMfG83AGqFezI/5ww7N8VLVJw6Nzk3aO/fXI2UUA/I3Ny/NgYGMDkB — 201 — 1.3 KiB — 302 ms — h2https://02179919.akstat.io/02179919.akstat.io/ https://02179919.akstat.io/ — 204 — 226 B — 257 ms — h2
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 1488ms · 869KB · £8/mo
www.pearson.com
Other
Costly
Execution 507ms
Transfer 0 KB
Monthly Cost £3/mo
Unattributable
Other
Optional
Execution 182ms
Transfer 0 KB
Monthly Cost £1/mo
www.pearson.com
Other
Optional
Execution 155ms
Transfer 1 KB
Unused 22%
Monthly Cost £1/mo
www.pearson.com
Other
Optional
Execution 146ms
Transfer 67 KB
Monthly Cost £1/mo
www.pearson.com
Other
Optional
Execution 142ms
Transfer 3 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 129ms
Transfer 206 KB
Unused 31%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 91ms
Transfer 124 KB
Unused 52%
Monthly Cost £0/mo
Google Tag Manager
Tag Manager
Optional
Execution 73ms
Transfer 170 KB
Unused 40%
Monthly Cost £0/mo
www.pearson.com
Other
Optional
Execution 63ms
Transfer 297 KB
Unused 82%
Monthly Cost £0/mo

These scripts may cost more than they're worth

  • www.pearson.com adds 507ms and costs ~£3/month

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

www.pearson.com takes 507ms 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.

Source: web.dev

52% of Google Tag Manager'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

82% of www.pearson.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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