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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
67
GRADE
D
FIX
6
REVIEW
1
PASS
6
INFO
2

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

Mobile Desktop
50
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.

1.12 s

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

3.04 s

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

631 ms

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

0.014

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

2.70 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.

5.19 s

Page Load Progression

508 ms
1.0 s
1.5 s
2.0 s
2.5 s
3.0 s
3.6 s
4.1 s
Checks
15
6 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
5.3 MB transferred, 103 requests
FIX
5.3 MB transferred, 103 requests
Critical::
Page weighs 11.3 MB (5.3 MB transferred)
Warning::
Images are 2.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.7 MB
Warning::
JavaScript is 2.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.2 MB
Warning::
103 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.1 g CO2 per page load
5.3 MB / 2.4 MB budget
5.3 MB transferred
103 requests
1.1 g CO2 per page load
Images 2.7 MiB 51%
JavaScript 2.2 MiB 42%
Fonts 115.6 KiB 2%
HTML 78.8 KiB 1%
Other 68.7 KiB 1%
CSS 51.6 KiB 1%
Other 19.3 KiB 0%
Other 4.8 KiB 0%
Other 1.3 KiB 0%
Other 0 B 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

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 (5.3 MiB of 5.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3375ms total JS execution
FIX
3375ms total JS execution
Warning::
https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b...: 564ms CPU time
Warning::
https://googletagmanager.com/gtm.js?id=GTM-NPVJBJ: 553ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 552ms CPU time
Warning::
Unattributable: 512ms CPU time
Warning::
https://www.lse.ac.uk/: 451ms CPU time
Warning::
Third-party scripts: 3375ms (100% of total)

Main Thread Breakdown

Script Evaluation 63% Other 15% Style & Layout 10% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/vendor.bb5a360d0375f6b8ed1a.mjs564ms458ms2ms3rd
https://googletagmanager.com/gtm.js?id=GTM-NPVJBJ553ms481ms39ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js552ms492ms34ms3rd
Unattributable512ms182ms0ms3rd
https://www.lse.ac.uk/451ms9ms12ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202411.2.0/otBannerSdk.js147ms81ms24ms3rd
https://www.googletagmanager.com/gtag/js?id=G-LWTEVFESYX&cx=c&gtm=4e64h1139ms90ms31ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-9957752&cx=c&gtm=4e64h185ms68ms15ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-704614692&cx=c&gtm=4e64h182ms63ms18ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-15061977&cx=c&gtm=4e64h182ms66ms15ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
25 scripts, 1.1 MB unused
FIX
25 scripts, 1.1 MB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 156 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 156 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 156 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b...: 101 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-167...: 65 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.1 MB
1144 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB156 KB (43%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB156 KB (43%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB156 KB (43%)✓3rd
https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/vendor.bb5a360d0375f6b8ed1a.mjs220 KB101 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-16709142613&cx=c&gtm=4e64h1144 KB65 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-704614692&cx=c&gtm=4e64h1146 KB65 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-9957752&cx=c&gtm=4e64h1129 KB63 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-14720610&cx=c&gtm=4e64h1129 KB63 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-LWTEVFESYX&cx=c&gtm=4e64h1178 KB62 KB (35%)✓3rd
https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/app.241b0616b255a2735102.mjs95 KB62 KB (66%)✓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
103 resources · 5.3 MB · 1.1 MB savings available
FIX
103 resources · 5.3 MB · 1.1 MB savings available
Warning::
Page weight 4.3 MB over 1MB target
Got: 5.3 MB Expected: ≤ 1 MB
Info::
~1.1 MB of savings available
Warning::
102 third-party resources (100% of weight)
Info::
7 resources over 200KB
103 resources · 5.3 MiB · 102 third-party 4.3 MiB over 1MB target
Image 52% · 2.7 MiB
JavaScript 43% · 2.3 MiB
Font 2% · 115.6 KiB
Document 1% · 79.6 KiB
CSS 1% · 55.9 KiB
Other 0% · 24.9 KiB

~1.1 MiB of savings available

Remove unused JavaScript: 1.1 MiB
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
38 images, 0 KB saveable
REVIEW
38 images, 0 KB saveable
Warning::
https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
38 images 2.7 MB
0 oversized -0 KB
9 legacy format
2 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

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
7 fonts (116 KB)
PASS
7 fonts (116 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

116 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 3.0 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 7 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 14 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 20 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 24 ms — font-display: swaphttps://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2ieVl2ZhZI2eCN5jzbjEETS9... https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2 — 45.0 KiB — 13 ms — font-display: swaphttps://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2ieVl2ZhZI2eCN5jzbjEETS9... https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2 — 0 B — 21 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 41 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 7 ms
Start 966 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 14 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 20 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 24 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
ieVl2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 45 KB
Load time 13 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
ieVl2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 0 KB
Load time 21 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 41 ms
Start 2.8 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Zengenti

Network Waterfall
103 requests over 4020ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.1 s LCP 3.0 shttps://lse.ac.uk// https://lse.ac.uk/ — 301 — 42 B — 73 ms — h2https://www.lse.ac.uk/www.lse.ac.uk/ https://www.lse.ac.uk/ — 200 — 51.2 KiB — 139 ms — h2https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.csscdn.jsdelivr.net/npm/swiper@11/swip... https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.css — 200 — 5.1 KiB — 29 ms — h2https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.jscdn.jsdelivr.net/npm/swiper@11/swip... https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.js — 200 — 43.2 KiB — 40 ms — h2https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/assets/LSE_logo.svgwww.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c... https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/assets/LSE_logo.svg — 200 — 3.5 KiB — 35 ms — h2https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/assets/LSE_logo_mobile.svgwww.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c... https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/assets/LSE_logo_mobile.svg — 200 — 1.3 KiB — 36 ms — h2https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/runtime.39621431ffd28fbdee80.mjswww.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c... https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/runtime.39621431ffd28fbdee80.mjs — 200 — 3.4 KiB — 67 ms — h2https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/vendor.bb5a360d0375f6b8ed1a.mjswww.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c... https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/vendor.bb5a360d0375f6b8ed1a.mjs — 200 — 219.6 KiB — 125 ms — h2https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/app.241b0616b255a2735102.mjswww.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c... https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/app.241b0616b255a2735102.mjs — 200 — 95.3 KiB — 100 ms — h2https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/428.2e26b75ad0d1a153b4f7.mjswww.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c... https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/428.2e26b75ad0d1a153b4f7.mjs — 200 — 10.0 KiB — 71 ms — h2https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/499.48614ae9148f2653fa5a.mjswww.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c... https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/499.48614ae9148f2653fa5a.mjs — 200 — 5.8 KiB — 79 ms — h2https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/home.template.843df33884bc5b949df9.mjswww.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c... https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/home.template.843df33884bc5b949df9.mjs — 200 — 1.5 KiB — 104 ms — 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https://ade.googlesyndication.com/ddm/activity/src=15061977;dc_pre=CMaP2P_c_5MDFSmJgwcdhGsygQ;type=invmedia;cat=lse-a0;rcb=16;ord=8487564711699;npa=1;gdid=dYWJhMj;uaa=x86;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=denied;frm=0;_tu=CFA;gtm=45fe64h1v9201512247z872405754za20gzb72405754zd72405754xea;gcs=G100;gcd=13q3q3q2q5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115938465~115938469~117266400~117884344~118128923;epver=2;~oref=https%3A%2F%2Fwww.lse.ac.uk%2F? — 200 — 118 B — 16 ms — h2https://cdn-ukwest.onetrust.com/logos/static/ot_guard_logo.svgcdn-ukwest.onetrust.com/logos/stati... https://cdn-ukwest.onetrust.com/logos/static/ot_guard_logo.svg — 200 — 488 B — 28 ms — h2https://cdn-ukwest.onetrust.com/logos/56f985e4-5ee2-4ab2-8496-98463ff3d1df/0192dd28-3291-731d-b040-25730d0f604d/f5893eca-a61f-487d-bfc7-c5ff870ad712/logo1.pngcdn-ukwest.onetrust.com/logos/56f98... https://cdn-ukwest.onetrust.com/logos/56f985e4-5ee2-4ab2-8496-98463ff3d1df/0192dd28-3291-731d-b040-25730d0f604d/f5893eca-a61f-487d-bfc7-c5ff870ad712/logo1.png — 200 — 1.7 KiB — 33 ms — h2https://cdn-ukwest.onetrust.com/logos/56f985e4-5ee2-4ab2-8496-98463ff3d1df/018ef11e-aa71-7fd3-a843-8cb7e61a6284/aa2aaa61-5f73-47ee-92dc-bb9b560f833d/LSE_LogoScreenshot_6.jpgcdn-ukwest.onetrust.com/logos/56f98... https://cdn-ukwest.onetrust.com/logos/56f985e4-5ee2-4ab2-8496-98463ff3d1df/018ef11e-aa71-7fd3-a843-8cb7e61a6284/aa2aaa61-5f73-47ee-92dc-bb9b560f833d/LSE_LogoScreenshot_6.jpg — 200 — 51.0 KiB — 30 ms — h2https://cdn-ukwest.onetrust.com/logos/static/powered_by_logo.svgcdn-ukwest.onetrust.com/logos/stati... https://cdn-ukwest.onetrust.com/logos/static/powered_by_logo.svg — 200 — 2.7 KiB — 25 ms — h2https://www.google.com/recaptcha/api2/reload?k=6Lc4I7crAAAAACq2IU7nFSiLkKvOzcBVj2N1JG-Wwww.google.com/recaptcha/api2/reloa... https://www.google.com/recaptcha/api2/reload?k=6Lc4I7crAAAAACq2IU7nFSiLkKvOzcBVj2N1JG-W — 200 — 2.1 KiB — 55 ms — h3https://www.google.com/recaptcha/api2/clr?k=6Lc4I7crAAAAACq2IU7nFSiLkKvOzcBVj2N1JG-Wwww.google.com/recaptcha/api2/clr?k... https://www.google.com/recaptcha/api2/clr?k=6Lc4I7crAAAAACq2IU7nFSiLkKvOzcBVj2N1JG-W — 200 — 16 B — 31 ms — h3
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 3375ms · 1483KB · £35/mo
www.lse.ac.uk
Other
Costly
Execution 564ms
Transfer 220 KB
Unused 46%
Monthly Cost £6/mo
Google Tag Manager
Tag Manager
Costly
Execution 553ms
Transfer 200 KB
Unused 25%
Monthly Cost £6/mo
www.gstatic.com
Other
Costly
Execution 552ms
Transfer 0 KB
Unused 43%
Monthly Cost £6/mo
Unattributable
Other
Costly
Execution 512ms
Transfer 0 KB
Monthly Cost £5/mo
www.lse.ac.uk
Other
Costly
Execution 451ms
Transfer 51 KB
Monthly Cost £5/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 147ms
Transfer 113 KB
Unused 53%
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 139ms
Transfer 178 KB
Unused 35%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 85ms
Transfer 129 KB
Unused 48%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 82ms
Transfer 146 KB
Unused 44%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 82ms
Transfer 130 KB
Unused 46%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 72ms
Transfer 144 KB
Unused 45%
Monthly Cost £1/mo
jsDelivr
CDN
Optional
Execution 72ms
Transfer 43 KB
Unused 61%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 65ms
Transfer 129 KB
Unused 48%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.lse.ac.uk adds 564ms and costs ~£6/month
  • Google Tag Manager adds 553ms and costs ~£6/month
  • www.gstatic.com adds 552ms and costs ~£6/month
  • Unattributable adds 512ms and costs ~£5/month
  • www.lse.ac.uk adds 451ms and costs ~£5/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.lse.ac.uk takes 564ms 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 553ms 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.gstatic.com takes 552ms 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 512ms 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.lse.ac.uk takes 451ms 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

53% of cdn-ukwest.onetrust.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

61% of jsDelivr'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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