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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
31
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.

7.66 s

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

16.42 s

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

1.55 s

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

0.000

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

7.78 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.

17.15 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
17
7 PASS 2 REVIEW 6 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 108 requests
FIX
2.2 MB transferred, 108 requests
Info::
Page weighs 7.7 MB (2.2 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::
108 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
108 requests
0.46 g CO2 per page load
JavaScript 1.6 MiB 72%
Images 235.4 KiB 11%
CSS 210.5 KiB 9%
Fonts 92.3 KiB 4%
HTML 71.7 KiB 3%
Other 11.0 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
Approaching limit

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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6742ms total JS execution
FIX
6742ms total JS execution
Warning::
https://www.pearson.com/: 1513ms CPU time
Warning::
Unattributable: 756ms CPU time
Warning::
https://www.pearson.com/6IgwutlUKWWSfwYMfG83AGqFez...: 655ms CPU time
Warning::
https://www.pearson.com/assets/386f225e49167f794e2...: 637ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MVH...: 578ms CPU time
Warning::
Third-party scripts: 6742ms (100% of total)

Main Thread Breakdown

Script Evaluation 63% Other 14% Style & Layout 9% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.pearson.com/1513ms830ms27ms3rd
Unattributable756ms60ms0ms3rd
https://www.pearson.com/6IgwutlUKWWSfwYMfG83AGqFezI/5ww7N8VLVJw6Nzk3aO/fXI2UUA/I3Ny/NgYGMDkB655ms524ms41ms3rd
https://www.pearson.com/assets/386f225e49167f794e266452faa1fa11422373f0727637ms433ms21ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MVH69VF578ms465ms93ms3rd
https://www.pearson.com/etc/cloudservices/geolocation/global-store/_jcr_content/geolocation-context.initScript.js561ms560ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5D4Z3ML&gtm=4e64h1340ms309ms28ms3rd
https://www.pearson.com/etc/clientlibs/one-dot-com/one-dot-com/he-ies-signin-modal.min.ACSHASHbbbeed361f6a3943648e4c2690317e1d.js256ms138ms104ms3rd
https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/jquery-3-6-0.min.ACSHASHf7f88c154f8dde28b5bcdd9e1c79f655.js222ms51ms13ms3rd
https://www.googletagmanager.com/gtag/js?id=G-K8MHCWK5EH&cx=c&gtm=4e64h1214ms165ms36ms3rd

Showing top 10 of 19 scripts

F
JS Bundles
Action
47 scripts, 567 KB unused
FIX
47 scripts, 567 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...: 67 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 (51%)
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: 567 KB
567 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=4e64h1170 KB67 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5D4Z3ML&gtm=4e64h1124 KB64 KB (51%)✓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 KB31 KB (65%)✓3rd
https://www.pearson.com/etc/clientlibs/one-dot-com/one-dot-com/evolution-clientlibs.min.ACSHASHb9efc756e112464733a8ae8d0ffcb6d6.js13 KB—✓3rd
https://www.pearson.com/etc/clientlibs/one-dot-com/one-dot-com/evolution-navigation/nav-aem-header.min.ACSHASH330cc3f8f8f1c4137e7f1bacbb28134d.js15 KB—✓3rd
https://www.pearson.com/etc.clientlibs/clientlibs/granite/backbone.min.ACSHASHe590febe6539b40e39ec9c983d8e96c0.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
108 resources · 2.2 MB · 567 KB savings available
FIX
108 resources · 2.2 MB · 567 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~567 KB of savings available
Warning::
107 third-party resources (100% of weight)
Info::
2 resources over 200KB
108 resources · 2.2 MiB · 107 third-party 1.2 MiB over 1MB target
JavaScript 72% · 1.6 MiB
Image 11% · 239.6 KiB
CSS 9% · 210.5 KiB
Font 4% · 92.3 KiB
Document 3% · 72.8 KiB
Other 1% · 17.5 KiB

~567.2 KiB of savings available

Remove unused JavaScript: 567.2 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
15 images, 0 KB saveable
REVIEW
15 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.
15 images 235 KB
0 oversized -0 KB
6 legacy format
5 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

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
2 fonts (92 KB)
PASS
2 fonts (92 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

92 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 7.7 s LCP 16.4 shttps://fonts.gstatic.com/s/plusjakartasans/v12/LDIoaomQNQcsA88c7O9yZ4KMCoOg4Ko20yygg_vb.woff2LDIoaomQNQcsA88c7O9yZ4K... https://fonts.gstatic.com/s/plusjakartasans/v12/LDIoaomQNQcsA88c7O9yZ4KMCoOg4Ko20yygg_vb.woff2 — 26.7 KiB — 29 ms — font-display: swaphttps://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/font-awesome-4-2/fonts/fontawesome-webfont.woff?v=4.2.0fontawesome-webfont.woff https://www.pearson.com/etc/clientlibs/platform/aem-core/libraries/font-awesome-4-2/fonts/fontawesome-webfont.woff?v=4.2.0 — 65.7 KiB — 24 ms — font-display: swap
LDIoaomQNQcsA88c7O9yZ4K... woff2 swap
Size 27 KB
Load time 29 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff woff swap
Size 66 KB
Load time 24 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~20 KB and ~40 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
1
prefetch
—

2 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
108 requests over 3791ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 7.7 s LCP 16.4 shttps://pearson.com// https://pearson.com/ — 301 — 246 B — 116 ms — http/1.1https://www.pearson.com/www.pearson.com/ https://www.pearson.com/ — 200 — 43.1 KiB — 182 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 — 21 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 — 18 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 — 138 ms — h2https://www.pearson.com/assets/386f225e49167f794e266452faa1fa11422373f0727www.pearson.com/assets/386f225e4916... https://www.pearson.com/assets/386f225e49167f794e266452faa1fa11422373f0727 — 200 — 67.4 KiB — 128 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 — 93 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 — 131 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 197 ms — https://k244.pearson.com/script.jsk244.pearson.com/script.js https://k244.pearson.com/script.js — -1 — 0 B — 291 ms — https://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 — 83 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 — 85 ms — h2https://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 — 102 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 — 86 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 — 88 ms — h2https://bc-sbx1.pearson.com/script.jsbc-sbx1.pearson.com/script.js https://bc-sbx1.pearson.com/script.js — -1 — 0 B — 396 ms — https://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 — 106 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 — 121 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 — 108 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 — 92 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 — 73 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 — 53 ms — 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http/1.1https://bam.nr-data.net/events/1/25fdf476ee?a=774664011&v=1.313.1&to=NVFSZkoAChJSWkFeDAwbY0JKCAoGcFZbQxENWFxXSk4IDlRQWxgLFllcHU5TSwJbXFZcMAdHQ1tXDyITUlRQGQsWWVwSECYhNRo%3D&rst=1186&ck=0&s=377de54649676c80&ref=https://login.pearson.com/v1/piapi/login/html/v2/checkSessionFrame.html&ptid=16c1f73c76da5cb3bam.nr-data.net/events/1/25fdf476ee... https://bam.nr-data.net/events/1/25fdf476ee?a=774664011&v=1.313.1&to=NVFSZkoAChJSWkFeDAwbY0JKCAoGcFZbQxENWFxXSk4IDlRQWxgLFllcHU5TSwJbXFZcMAdHQ1tXDyITUlRQGQsWWVwSECYhNRo%3D&rst=1186&ck=0&s=377de54649676c80&ref=https://login.pearson.com/v1/piapi/login/html/v2/checkSessionFrame.html&ptid=16c1f73c76da5cb3 — 200 — 370 B — 209 ms — http/1.1blob:https://www.pearson.com/ee694e19-6e2f-420a-921d-688b8149bcecwww.pearson.com/ee694e19-6e2f-420a-... blob:https://www.pearson.com/ee694e19-6e2f-420a-921d-688b8149bcec — -1 — 0 B — 0 ms — https://region1.google-analytics.com/g/collect?v=2&tid=G-K8MHCWK5EH&gtm=45je64h1v873843660z8812135862za20gzb812135862zd812135862&_p=1776810422996&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&are=1&cid=1435697994.1776810425&frm=0&pscdl=denied&rcb=18&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938468~117266401&dl=https%3A%2F%2Fwww.pearson.com%2F&dr=&sid=1776810424&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=2553region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-K8MHCWK5EH&gtm=45je64h1v873843660z8812135862za20gzb812135862zd812135862&_p=1776810422996&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&are=1&cid=1435697994.1776810425&frm=0&pscdl=denied&rcb=18&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938468~117266401&dl=https%3A%2F%2Fwww.pearson.com%2F&dr=&sid=1776810424&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=2553 — 204 — 549 B — 91 ms — h2https://c.go-mpulse.net/api/config.json?key=XCNNJ-G8PCV-U855W-LP259-ULUSU&d=www.pearson.com&t=5922701&v=1.792.70&sl=0&si=a685698b-a03a-4913-a255-0b7132f687dd-tdv7p2&plugins=AK,ConfigOverride,Continuity,PageParams,RT,PaintTiming,NavigationTiming,ResourceTiming,Memory,Errors,Akamai,EventTiming,BFCache,LOGN&acao=&ak.ai=503985c.go-mpulse.net/api/config.json?key... https://c.go-mpulse.net/api/config.json?key=XCNNJ-G8PCV-U855W-LP259-ULUSU&d=www.pearson.com&t=5922701&v=1.792.70&sl=0&si=a685698b-a03a-4913-a255-0b7132f687dd-tdv7p2&plugins=AK,ConfigOverride,Continuity,PageParams,RT,PaintTiming,NavigationTiming,ResourceTiming,Memory,Errors,Akamai,EventTiming,BFCache,LOGN&acao=&ak.ai=503985 — 200 — 1.2 KiB — 402 ms — h2https://bam.nr-data.net/events/1/068b3faa02?a=1120248489&sa=1&v=1.246.1&t=Unnamed%20Transaction&rst=2588&ck=0&s=bf0b0d03d0da3781&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=2588&ck=0&s=bf0b0d03d0da3781&ref=https://www.pearson.com/ — 200 — 368 B — 108 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 — 205 ms — h2https://684dd32f.akstat.io/684dd32f.akstat.io/ https://684dd32f.akstat.io/ — 204 — 226 B — 288 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 6742ms · 1171KB · £35/mo
www.pearson.com
Other
Costly
Execution 1513ms
Transfer 0 KB
Monthly Cost £8/mo
Unattributable
Other
Costly
Execution 756ms
Transfer 0 KB
Monthly Cost £4/mo
www.pearson.com
Other
Costly
Execution 655ms
Transfer 1 KB
Unused 22%
Monthly Cost £3/mo
www.pearson.com
Other
Costly
Execution 637ms
Transfer 67 KB
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Costly
Execution 578ms
Transfer 206 KB
Unused 31%
Monthly Cost £3/mo
www.pearson.com
Other
Costly
Execution 561ms
Transfer 3 KB
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Costly
Execution 340ms
Transfer 124 KB
Unused 51%
Monthly Cost £2/mo
www.pearson.com
Other
Costly
Execution 256ms
Transfer 297 KB
Unused 82%
Monthly Cost £1/mo
www.pearson.com
Other
Costly
Execution 222ms
Transfer 32 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Costly
Execution 214ms
Transfer 170 KB
Unused 40%
Monthly Cost £1/mo
login.pearson.com
Other
Optional
Execution 186ms
Transfer 29 KB
Monthly Cost £1/mo
js-agent.newrelic.com
Other
Optional
Execution 158ms
Transfer 26 KB
Monthly Cost £1/mo
www.pearson.com
Other
Optional
Execution 156ms
Transfer 10 KB
Monthly Cost £1/mo
js-agent.newrelic.com
Other
Optional
Execution 135ms
Transfer 30 KB
Monthly Cost £1/mo
www.pearson.com
Other
Optional
Execution 111ms
Transfer 2 KB
Monthly Cost £1/mo
www.pearson.com
Other
Optional
Execution 76ms
Transfer 8 KB
Monthly Cost £0/mo
s.go-mpulse.net
Other
Optional
Execution 70ms
Transfer 46 KB
Monthly Cost £0/mo
www.pearson.com
Other
Optional
Execution 60ms
Transfer 68 KB
Unused 89%
Monthly Cost £0/mo
www.pearson.com
Other
Optional
Execution 57ms
Transfer 50 KB
Unused 65%
Monthly Cost £0/mo

These scripts may cost more than they're worth

  • www.pearson.com adds 1513ms and costs ~£8/month
  • Unattributable adds 756ms and costs ~£4/month
  • www.pearson.com adds 655ms and costs ~£3/month
  • www.pearson.com adds 637ms and costs ~£3/month
  • Google Tag Manager adds 578ms and costs ~£3/month
  • www.pearson.com adds 561ms and costs ~£3/month
  • Google Tag Manager adds 340ms and costs ~£2/month
  • www.pearson.com adds 256ms and costs ~£1/month
  • www.pearson.com adds 222ms and costs ~£1/month
  • Google Tag Manager adds 214ms and costs ~£1/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 1513ms 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

Unattributable takes 756ms 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

www.pearson.com takes 655ms 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

www.pearson.com takes 637ms 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

Google Tag Manager takes 578ms 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

www.pearson.com takes 561ms 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

Google Tag Manager takes 340ms 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

51% 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

www.pearson.com takes 256ms 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

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

www.pearson.com takes 222ms 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

Google Tag Manager takes 214ms 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

89% 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

65% 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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