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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
67
GRADE
D
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
28
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.

6.47 s

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

12.07 s

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

3.43 s

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

0.042

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

7.50 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.

25.36 s

Page Load Progression

499 ms
999 ms
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
17
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
4.8 MB transferred, 91 requests
FIX
4.8 MB transferred, 91 requests
Critical::
Page weighs 10.8 MB (4.8 MB transferred)
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::
Images are 2.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.2 MB
Info::
91 HTTP requests
Info::
Estimated 1.0 g CO2 per page load
4.8 MB / 2.4 MB budget
4.8 MB transferred
91 requests
1.0 g CO2 per page load
JavaScript 2.2 MiB 47%
Images 2.2 MiB 46%
Fonts 115.6 KiB 2%
HTML 78.9 KiB 2%
Other 68.7 KiB 1%
CSS 51.6 KiB 1%
Other 18.5 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

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

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

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 (4.8 MiB of 4.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
12800ms total JS execution
FIX
12800ms total JS execution
Warning::
https://googletagmanager.com/gtm.js?id=GTM-NPVJBJ: 2317ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 2249ms CPU time
Warning::
Unattributable: 1968ms CPU time
Warning::
https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b...: 1840ms CPU time
Warning::
https://www.lse.ac.uk/: 1830ms CPU time
Warning::
Third-party scripts: 12800ms (100% of total)

Main Thread Breakdown

Script Evaluation 64% Other 14% Style & Layout 8% Script Parsing & Compilation 7% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://googletagmanager.com/gtm.js?id=GTM-NPVJBJ2317ms2042ms184ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js2249ms1942ms138ms3rd
Unattributable1968ms744ms0ms3rd
https://www.lse.ac.uk/_mClaLQ_ecc5b3e5-e43c-4685-b93a-3ff09749c378/static/modern/js/vendor.bb5a360d0375f6b8ed1a.mjs1840ms1606ms6ms3rd
https://www.lse.ac.uk/1830ms33ms33ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202411.2.0/otBannerSdk.js707ms424ms96ms3rd
https://www.googletagmanager.com/gtag/js?id=G-LWTEVFESYX&cx=c&gtm=4e64h1389ms299ms87ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-16709142613&cx=c&gtm=4e64h1295ms227ms64ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-704614692&cx=c&gtm=4e64h1264ms200ms61ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-15061977&cx=c&gtm=4e64h1229ms171ms55ms3rd

Showing top 10 of 15 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-704...: 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.js362 KB156 KB (43%)✓3rd
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.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-704614692&cx=c&gtm=4e64h1146 KB65 KB (45%)✓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=DC-9957752&cx=c&gtm=4e64h1130 KB63 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-14720610&cx=c&gtm=4e64h1130 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
91 resources · 4.8 MB · 1.1 MB savings available
FIX
91 resources · 4.8 MB · 1.1 MB savings available
Warning::
Page weight 3.8 MB over 1MB target
Got: 4.8 MB Expected: ≤ 1 MB
Info::
~1.1 MB of savings available
Warning::
90 third-party resources (100% of weight)
Info::
7 resources over 200KB
91 resources · 4.8 MiB · 90 third-party 3.8 MiB over 1MB target
JavaScript 48% · 2.3 MiB
Image 47% · 2.2 MiB
Font 2% · 115.6 KiB
Document 2% · 78.9 KiB
CSS 1% · 55.9 KiB
Other 1% · 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
27 images, 0 KB saveable
REVIEW
27 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.
27 images 2.2 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 6.5 s LCP 12.1 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 11 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 17 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 13 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 22 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 — 21 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 — 25 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 19 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 11 ms
Start 838 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 17 ms
Start 839 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 13 ms
Start 839 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 22 ms
Start 839 ms
Risk FOUT — text flashes from fallback to web font
ieVl2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 45 KB
Load time 21 ms
Start 839 ms
Risk FOUT — text flashes from fallback to web font
ieVl2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 0 KB
Load time 25 ms
Start 840 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 19 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
1
prefetch
—

3 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
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
91 requests over 4102ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 6.5 s LCP 12.1 shttps://lse.ac.uk// https://lse.ac.uk/ — 301 — 42 B — 71 ms — h2https://www.lse.ac.uk/www.lse.ac.uk/ https://www.lse.ac.uk/ — 200 — 51.2 KiB — 106 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 — 28 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 — 32 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 — 34 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 — 35 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 — 48 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 — 101 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 — 56 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 — 65 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 — 87 ms — 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h2https://cdn-ukwest.onetrust.com/scripttemplates/202411.2.0/assets/v2/otPcCenter.jsoncdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/202411.2.0/assets/v2/otPcCenter.json — 200 — 12.7 KiB — 30 ms — h2https://cdn-ukwest.onetrust.com/scripttemplates/202411.2.0/assets/otCommonStyles.csscdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/202411.2.0/assets/otCommonStyles.css — 200 — 4.3 KiB — 35 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=17&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&ep.ads_data_redaction=0&gdid=dYWJhMj&gtm=45He64h1v72405754za200zd72405754xea&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938468~117266401~117884344&apve=1&apvf=f&apvc=1&tft=1776801364003&tfd=2708pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=17&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&ep.ads_data_redaction=0&gdid=dYWJhMj&gtm=45He64h1v72405754za200zd72405754xea&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938468~117266401~117884344&apve=1&apvf=f&apvc=1&tft=1776801364003&tfd=2708 — 200 — 21 B — 284 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=5&frm=0&en=page_view&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&gdid=dYWJhMj&_tu=KA&gtm=45be64h1v9203219023z872405754za20gzb72405754zd72405754xec&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938469~117266401&apve=1&apvf=f&apvc=0&tids=AW-16709142613&tid=AW-16709142613&tft=1776801364005&tfd=2710pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=5&frm=0&en=page_view&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&gdid=dYWJhMj&_tu=KA&gtm=45be64h1v9203219023z872405754za20gzb72405754zd72405754xec&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938469~117266401&apve=1&apvf=f&apvc=0&tids=AW-16709142613&tid=AW-16709142613&tft=1776801364005&tfd=2710 — 200 — 21 B — 283 ms — h3https://ade.googlesyndication.com/ddm/activity/src=15061977;type=invmedia;cat=lse-a0;rcb=13;ord=6021927894351;npa=1;gdid=dYWJhMj;uaa=;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=denied;frm=0;_tu=AFA;gtm=45fe64h1v9201512247z872405754za20gzb72405754zd72405754xea;gcs=G100;gcd=13q3q3q2q5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115938465~115938468~117266401;epver=2;~oref=https%3A%2F%2Fwww.lse.ac.uk%2F?ade.googlesyndication.com/ddm/activ... https://ade.googlesyndication.com/ddm/activity/src=15061977;type=invmedia;cat=lse-a0;rcb=13;ord=6021927894351;npa=1;gdid=dYWJhMj;uaa=;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=denied;frm=0;_tu=AFA;gtm=45fe64h1v9201512247z872405754za20gzb72405754zd72405754xea;gcs=G100;gcd=13q3q3q2q5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115938465~115938468~117266401;epver=2;~oref=https%3A%2F%2Fwww.lse.ac.uk%2F? — 200 — 401 B — 102 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=10&frm=0&en=page_view&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&gdid=dYWJhMj&_tu=KA&gtm=45fe64h1v9190774852z872405754za20gzb72405754zd72405754xec&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938465~115938469~117266400~117884344&apve=1&apvf=f&apvc=0&tids=DC-9957752&tid=DC-9957752&tft=1776801364006&tfd=2711pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=10&frm=0&en=page_view&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&gdid=dYWJhMj&_tu=KA&gtm=45fe64h1v9190774852z872405754za20gzb72405754zd72405754xec&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938465~115938469~117266400~117884344&apve=1&apvf=f&apvc=0&tids=DC-9957752&tid=DC-9957752&tft=1776801364006&tfd=2711 — 200 — 21 B — 279 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=13&frm=0&en=page_view&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&gdid=dYWJhMj&_tu=KA&gtm=45fe64h1v9201512247z872405754za20gzb72405754zd72405754xec&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938468~117266401&apve=1&apvf=f&apvc=0&tids=DC-15061977&tid=DC-15061977&tft=1776801364007&tfd=2713pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=13&frm=0&en=page_view&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&gdid=dYWJhMj&_tu=KA&gtm=45fe64h1v9201512247z872405754za20gzb72405754zd72405754xec&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938468~117266401&apve=1&apvf=f&apvc=0&tids=DC-15061977&tid=DC-15061977&tft=1776801364007&tfd=2713 — 200 — 21 B — 281 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=1&frm=0&en=page_view&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&gdid=dYWJhMj&_tu=KA&gtm=45fe64h1v9191350102z872405754za20gzb72405754zd72405754xec&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938468~117266400~118463261&apve=1&apvf=f&apvc=0&tids=DC-14720610&tid=DC-14720610&tft=1776801364009&tfd=2714pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=1&frm=0&en=page_view&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&gdid=dYWJhMj&_tu=KA&gtm=45fe64h1v9191350102z872405754za20gzb72405754zd72405754xec&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938468~117266400~118463261&apve=1&apvf=f&apvc=0&tids=DC-14720610&tid=DC-14720610&tft=1776801364009&tfd=2714 — 200 — 21 B — 279 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=5&frm=0&en=page_view&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&gdid=dYWJhMj&_tu=KA&gtm=45be64h1v9165020906z872405754za20gzb72405754zd72405754xec&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938469~117266401&apve=1&apvf=f&apvc=0&tids=AW-704614692&tid=AW-704614692&tft=1776801364010&tfd=2716pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=5&frm=0&en=page_view&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&gdid=dYWJhMj&_tu=KA&gtm=45be64h1v9165020906z872405754za20gzb72405754zd72405754xec&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938469~117266401&apve=1&apvf=f&apvc=0&tids=AW-704614692&tid=AW-704614692&tft=1776801364010&tfd=2716 — 200 — 21 B — 275 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=5&frm=0&ae=g&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&gdid=dYWJhMj&_tu=KA&gtm=45be64h1v9165020906z872405754za20gzb72405754zd72405754xea&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938469~117266401&apve=1&apvf=f&apvc=0&tids=AW-704614692&tid=AW-704614692&tft=1776801364011&tfd=2716pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=5&frm=0&ae=g&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&gdid=dYWJhMj&_tu=KA&gtm=45be64h1v9165020906z872405754za20gzb72405754zd72405754xea&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938469~117266401&apve=1&apvf=f&apvc=0&tids=AW-704614692&tid=AW-704614692&tft=1776801364011&tfd=2716 — 200 — 21 B — 275 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=15&frm=0&en=page_view&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&gdid=dYWJhMj&gtm=45je64h1v9108099530z872405754za20gzb72405754zd72405754xec&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938468~117266401~117512542~118463261&apve=1&apvf=f&apvc=0&tids=AW-969861968&tid=AW-969861968&tft=1776801364012&tfd=2717pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=15&frm=0&en=page_view&dl=https%3A%2F%2Fwww.lse.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1946513946.1776801364&navt=n&npa=1&gdid=dYWJhMj&gtm=45je64h1v9108099530z872405754za20gzb72405754zd72405754xec&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938468~117266401~117512542~118463261&apve=1&apvf=f&apvc=0&tids=AW-969861968&tid=AW-969861968&tft=1776801364012&tfd=2717 — 200 — 21 B — 272 ms — h3https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4www.google.com/recaptcha/api2/webwo... https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4 — 200 — 23 B — 376 ms — h3https://www.gstatic.com/recaptcha/api2/logo_48.pngwww.gstatic.com/recaptcha/api2/logo... https://www.gstatic.com/recaptcha/api2/logo_48.png — 200 — 2.3 KiB — 22 ms — h2https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2fonts.gstatic.com/s/roboto/v48/KFO7... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 200 — 33.9 KiB — 19 ms — h3https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 0 B — 19 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 — 24 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 — 44 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 — 46 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 — 32 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 — 68 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 — 25 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 12800ms · 1495KB · £133/mo
Google Tag Manager
Tag Manager
Costly
Execution 2317ms
Transfer 200 KB
Unused 25%
Monthly Cost £24/mo
www.gstatic.com
Other
Costly
Execution 2249ms
Transfer 0 KB
Unused 43%
Monthly Cost £23/mo
Unattributable
Other
Costly
Execution 1968ms
Transfer 0 KB
Monthly Cost £20/mo
www.lse.ac.uk
Other
Costly
Execution 1840ms
Transfer 220 KB
Unused 46%
Monthly Cost £19/mo
www.lse.ac.uk
Other
Costly
Execution 1830ms
Transfer 51 KB
Monthly Cost £19/mo
cdn-ukwest.onetrust.com
Other
Costly
Execution 707ms
Transfer 113 KB
Unused 53%
Monthly Cost £7/mo
Google Tag Manager
Tag Manager
Costly
Execution 389ms
Transfer 178 KB
Unused 35%
Monthly Cost £4/mo
Google Tag Manager
Tag Manager
Costly
Execution 295ms
Transfer 144 KB
Unused 45%
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Costly
Execution 264ms
Transfer 146 KB
Unused 45%
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Costly
Execution 229ms
Transfer 130 KB
Unused 46%
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Costly
Execution 228ms
Transfer 130 KB
Unused 48%
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Costly
Execution 226ms
Transfer 130 KB
Unused 48%
Monthly Cost £2/mo
jsDelivr
CDN
Optional
Execution 121ms
Transfer 43 KB
Unused 60%
Monthly Cost £1/mo
unpkg
CDN
Optional
Execution 83ms
Transfer 3 KB
Monthly Cost £1/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 54ms
Transfer 9 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 2317ms and costs ~£24/month
  • www.gstatic.com adds 2249ms and costs ~£23/month
  • Unattributable adds 1968ms and costs ~£20/month
  • www.lse.ac.uk adds 1840ms and costs ~£19/month
  • www.lse.ac.uk adds 1830ms and costs ~£19/month
  • cdn-ukwest.onetrust.com adds 707ms and costs ~£7/month
  • Google Tag Manager adds 389ms and costs ~£4/month
  • Google Tag Manager adds 295ms and costs ~£3/month
  • Google Tag Manager adds 264ms and costs ~£3/month
  • Google Tag Manager adds 229ms and costs ~£2/month
  • Google Tag Manager adds 228ms and costs ~£2/month
  • Google Tag Manager adds 226ms and costs ~£2/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.

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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

Google Tag Manager takes 2317ms 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 2249ms 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 1968ms 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 1840ms 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 1830ms 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

cdn-ukwest.onetrust.com takes 707ms 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

Google Tag Manager takes 389ms 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 295ms 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 264ms 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 229ms 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 228ms 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 226ms 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

60% 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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