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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
47
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
64
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
77
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.

5.96 s

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

11.88 s

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

479 ms

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.

6.93 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.

12.01 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
8 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
12.4 MB transferred, 69 requests
FIX
12.4 MB transferred, 69 requests
Critical::
Page weighs 14.6 MB (12.4 MB transferred)
Warning::
JavaScript is 661 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 661 KB
Info::
69 HTTP requests
Info::
Estimated 2.6 g CO2 per page load
12.4 MB / 2.4 MB budget
12.4 MB transferred
69 requests
2.6 g CO2 per page load
Other 10.7 MiB 87%
Images 869.8 KiB 7%
JavaScript 660.7 KiB 5%
Fonts 95.6 KiB 1%
CSS 39.8 KiB 0%
Other 15.5 KiB 0%
HTML 14.3 KiB 0%
Other 8.6 KiB 0%
Other 3.9 KiB 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

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 (12.4 MiB of 12.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2301ms total JS execution
FIX
2301ms total JS execution
Warning::
Unattributable: 660ms CPU time
Warning::
https://www.informa.com/static/js/app.js: 654ms CPU time
Warning::
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88...: 265ms CPU time
Info::
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88...: 196ms CPU time
Info::
https://www.informa.com/: 194ms CPU time
Warning::
Third-party scripts: 2301ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Other 22% Style & Layout 16% Script Parsing & Compilation 7% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable660ms182ms0ms3rd
https://www.informa.com/static/js/app.js654ms316ms34ms3rd
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/ui.js265ms214ms29ms3rd
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/airgap.js196ms167ms26ms3rd
https://www.informa.com/194ms23ms5ms3rd
https://www.googletagmanager.com/gtag/js?id=G-5JWGC6659C&cx=c&gtm=4e64h1179ms138ms40ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-609180-32154ms115ms29ms3rd
D
Page Weight Inventory
Action
69 resources · 12.4 MB · 266 KB savings available
FIX
69 resources · 12.4 MB · 266 KB savings available
Warning::
Page weight 11.4 MB over 1MB target
Got: 12.4 MB Expected: ≤ 1 MB
Info::
~266 KB of savings available
Warning::
68 third-party resources (100% of weight)
Info::
2 resources over 200KB
69 resources · 12.4 MiB · 68 third-party 11.4 MiB over 1MB target
Media 87% · 10.7 MiB
Image 7% · 870.9 KiB
JavaScript 5% · 660.7 KiB
Font 1% · 95.6 KiB
CSS 0% · 39.8 KiB
Other 0% · 24.2 KiB
Document 0% · 17.0 KiB

~266.0 KiB of savings available

Remove unused JavaScript: 266.0 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.

B
Image Optimization
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
https://www.informa.com/globalassets/global/inform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.informa.com/contentassets/836ece4994b2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.informa.com/globalassets/investors/ann... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.informa.com/contentassets/6a97eafeafc2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.informa.com/globalassets/investors/ann... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.informa.com/globalassets/investors/ann... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.informa.com/globalassets/investors/ann... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 870 KB
0 oversized -0 KB
3 legacy format
7 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

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 Bundles
Action
17 scripts, 266 KB unused
REVIEW
17 scripts, 266 KB unused
Warning::
https://www.informa.com/static/js/app.js: 115 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-5JWG...: 62 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-609...: 62 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88...: 27 KB unused (33%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 266 KB
266 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.informa.com/static/js/app.js171 KB115 KB (67%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-5JWGC6659C&cx=c&gtm=4e64h1146 KB62 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-609180-32125 KB62 KB (49%)✓3rd
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/ui.js84 KB27 KB (33%)✓3rd
https://irs.tools.investis.com/Clients/ScriptResource.axd?d=phUDbPSTuDJhZPpKVPyUofwev3inlBV9AJTGAba8tTaFl-AqjaLWYLe8UT2gWqRF1g5xQV9wptY0aHDMZxEhioiUdRdSeQ4BqoFAOqq3HCKdP5AcHwRvJTrJWvm7kSUqsW7v5yf5yTprzV72r_i01wI0rF01&t=32e5dfca25 KB—✓3rd
https://dl.episerver.net/13.6.1/epi-util/find.js3 KB—✓3rd
https://www.informa.com/static/js/modernizr.js5 KB—✓3rd
https://irs.tools.investis.com/Clients/WebResource.axd?d=l5N7JybNhTLypzkQMlX1RrPYYa8-IfbiBWYX_dYWV_-vM6XOdd77mh2SHc-7kSraa555GZ-6dGUDwvcK0oYqjlubHjc1&t=6389422108053101366 KB—✓3rd
https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/airgap.js78 KB—✓3rd
https://irs.tools.investis.com/Clients/ScriptResource.axd?d=FwYZ1XsKukon8O-wmMqiEW1BO-M_bBNvwFeKg9zmPSUio3tINVA5oz2-K4n8Yv6FsCAhGyNDdOuwu5M71wNzdfr5Uk8k9RFjsv6kd3t3-6R_F-6RCD-Hjl4oB6KAFlSW8NlAberr3rkLS_TwVZNhhPoRppWtzRDH6R5LvOmhuAIB_85w0&t=32e5dfca10 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

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
5 fonts (96 KB)
PASS
5 fonts (96 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

96 KB total

Render-blocking

0

of 5

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 6.0 s LCP 11.9 shttps://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVIUx6EQ.woff2memSYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVIUx6EQ.woff2 — 13.1 KiB — 44 ms — font-display: swaphttps://fonts.gstatic.com/s/aleo/v16/c4m61nF8G8_s6gHhIOX0IYBo_KJ3GlP6Fo8ICwtI.woff2c4m61nF8G8_s6gHhIOX0IYB... https://fonts.gstatic.com/s/aleo/v16/c4m61nF8G8_s6gHhIOX0IYBo_KJ3GlP6Fo8ICwtI.woff2 — 14.4 KiB — 46 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B5OaVIUx6EQRjA.woff2memSYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B5OaVIUx6EQRjA.woff2 — 6.6 KiB — 37 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B5caVIUx6EQRjA.woff2memSYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B5caVIUx6EQRjA.woff2 — 14.2 KiB — 27 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-muw.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-muw.woff2 — 47.2 KiB — 45 ms — font-display: swap
memSYaGs126MiZpBA-UvWbX... woff2 swap
Size 13 KB
Load time 44 ms
Start 973 ms
Risk FOUT — text flashes from fallback to web font
c4m61nF8G8_s6gHhIOX0IYB... woff2 swap
Size 14 KB
Load time 46 ms
Start 974 ms
Risk FOUT — text flashes from fallback to web font
memSYaGs126MiZpBA-UvWbX... woff2 swap
Size 7 KB
Load time 37 ms
Start 978 ms
Risk FOUT — text flashes from fallback to web font
memSYaGs126MiZpBA-UvWbX... woff2 swap
Size 14 KB
Load time 27 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 47 KB
Load time 45 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
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: Cloudflare

Network Waterfall
69 requests over 1720ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 6.0 s LCP 11.9 shttps://informa.com// https://informa.com/ — 301 — 119 B — 68 ms — h2https://www.informa.com/www.informa.com/ https://www.informa.com/ — 200 — 11.7 KiB — 154 ms — h2https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/airgap.jstranscend-cdn.com/cm/ef49a3f1-d8c1-... https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/airgap.js — 200 — 77.6 KiB — 420 ms — h3https://www.googletagmanager.com/gtag/js?id=UA-609180-32www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-609180-32 — 200 — 125.3 KiB — 156 ms — h2https://www.informa.com/static/js/modernizr.jswww.informa.com/static/js/modernizr... https://www.informa.com/static/js/modernizr.js — 200 — 4.7 KiB — 41 ms — h2https://www.informa.com/static/css/styles.css?v=1.1.1.1www.informa.com/static/css/styles.c... https://www.informa.com/static/css/styles.css?v=1.1.1.1 — 200 — 32.2 KiB — 43 ms — h2https://www.informa.com/globalassets/global/informa_logo_oneline_indigosmall-1-1-1.pngwww.informa.com/globalassets/global... https://www.informa.com/globalassets/global/informa_logo_oneline_indigosmall-1-1-1.png — 200 — 5.5 KiB — 40 ms — h2https://www.informa.com/globalassets/investors/annual-report-2024/infnewherobannerfullar2025.jpgwww.informa.com/globalassets/invest... https://www.informa.com/globalassets/investors/annual-report-2024/infnewherobannerfullar2025.jpg — 200 — 273.9 KiB — 74 ms — h2https://www.informa.com/contentassets/836ece4994b2486abe21d4842d021147/resultshy25.jpgwww.informa.com/contentassets/836ec... https://www.informa.com/contentassets/836ece4994b2486abe21d4842d021147/resultshy25.jpg — 200 — 5.6 KiB — 37 ms — h3https://www.informa.com/globalassets/documents/misc/ar-hubbanner.jpgwww.informa.com/globalassets/docume... https://www.informa.com/globalassets/documents/misc/ar-hubbanner.jpg — 200 — 46.2 KiB — 66 ms — h3https://www.informa.com/globalassets/investors/annual-report-2022/jt-new/homepageicon2.jpgwww.informa.com/globalassets/invest... https://www.informa.com/globalassets/investors/annual-report-2022/jt-new/homepageicon2.jpg — 200 — 14.8 KiB — 61 ms — h3https://dl.episerver.net/13.6.1/epi-util/find.jsdl.episerver.net/13.6.1/epi-util/fi... https://dl.episerver.net/13.6.1/epi-util/find.js — 200 — 2.9 KiB — 110 ms — h2https://www.informa.com/static/js/app.jswww.informa.com/static/js/app.js https://www.informa.com/static/js/app.js — 200 — 171.5 KiB — 64 ms — h3https://www.informa.com/Global/Icon/Informa_icon_statement-web-40x40.pngwww.informa.com/Global/Icon/Informa... https://www.informa.com/Global/Icon/Informa_icon_statement-web-40x40.png — 301 — 292 B — 34 ms — h3https://www.informa.com/global/icon/informa_icon_statement-web-40x40.pngwww.informa.com/global/icon/informa... https://www.informa.com/global/icon/informa_icon_statement-web-40x40.png — 301 — 324 B — 68 ms — h3https://www.informa.com/globalassets/global/icon/informa_icon_statement-web-40x40.pngwww.informa.com/globalassets/global... https://www.informa.com/globalassets/global/icon/informa_icon_statement-web-40x40.png — 200 — 738 B — 32 ms — h3https://www.informa.com/Global/Icon/Informa_icon_presentation-web-40x40.pngwww.informa.com/Global/Icon/Informa... https://www.informa.com/Global/Icon/Informa_icon_presentation-web-40x40.png — 301 — 294 B — 74 ms — h3https://www.informa.com/Global/Icon/Informa_icon_video-camera-web-40x40.pngwww.informa.com/Global/Icon/Informa... https://www.informa.com/Global/Icon/Informa_icon_video-camera-web-40x40.png — 301 — 294 B — 40 ms — h3https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/policies/GDPR.jsontranscend-cdn.com/cm/ef49a3f1-d8c1-... https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/policies/GDPR.json — 200 — 6.4 KiB — 264 ms — h3https://www.informa.com/global/icon/informa_icon_presentation-web-40x40.pngwww.informa.com/global/icon/informa... https://www.informa.com/global/icon/informa_icon_presentation-web-40x40.png — 301 — 326 B — 65 ms — h3https://www.informa.com/global/icon/informa_icon_video-camera-web-40x40.pngwww.informa.com/global/icon/informa... https://www.informa.com/global/icon/informa_icon_video-camera-web-40x40.png — 301 — 326 B — 113 ms — h3https://fonts.googleapis.com/css?family=Aleo|Open+Sansfonts.googleapis.com/css?family=Ale... https://fonts.googleapis.com/css?family=Aleo|Open+Sans — 200 — 2.1 KiB — 93 ms — h2https://www.informa.com/globalassets/global/icon/informa_icon_presentation-web-40x40.pngwww.informa.com/globalassets/global... https://www.informa.com/globalassets/global/icon/informa_icon_presentation-web-40x40.png — 200 — 787 B — 34 ms — h3https://www.informa.com/Global/Icon/Informa_icon_transcript-web-40x40.pngwww.informa.com/Global/Icon/Informa... 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h2https://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B5caVIUx6EQRjA.woff2fonts.gstatic.com/s/opensans/v44/me... https://fonts.gstatic.com/s/opensans/v44/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B5caVIUx6EQRjA.woff2 — 200 — 14.2 KiB — 27 ms — h3https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-muw.woff2fonts.gstatic.com/s/opensans/v44/me... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-muw.woff2 — 200 — 47.2 KiB — 45 ms — h3https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/vendor-list.jsontranscend-cdn.com/cm/ef49a3f1-d8c1-... https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/vendor-list.json — 200 — 15.5 KiB — 229 ms — h3https://www.informa.com/Static/images/assets/favicon.pngwww.informa.com/Static/images/asset... https://www.informa.com/Static/images/assets/favicon.png — 200 — 1.1 KiB — 49 ms — h3https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/translations/en.jsontranscend-cdn.com/cm/ef49a3f1-d8c1-... https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/translations/en.json — 200 — 2.2 KiB — 323 ms — h3https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/tcf.csstranscend-cdn.com/cm/ef49a3f1-d8c1-... https://transcend-cdn.com/cm/ef49a3f1-d8c1-47d6-88fc-50e41130631f/tcf/tcf.css — 200 — 3.4 KiB — 36 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 2301ms · 617KB · €25/mo
Unattributable
Other
Costly
Execution 660ms
Transfer 0 KB
Monthly Cost €7/mo
www.informa.com
Other
Costly
Execution 654ms
Transfer 171 KB
Unused 67%
Monthly Cost €7/mo
transcend-cdn.com
Other
Costly
Execution 265ms
Transfer 84 KB
Unused 33%
Monthly Cost €3/mo
transcend-cdn.com
Other
Optional
Execution 196ms
Transfer 78 KB
Monthly Cost €2/mo
www.informa.com
Other
Optional
Execution 194ms
Transfer 12 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 179ms
Transfer 146 KB
Unused 43%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 154ms
Transfer 125 KB
Unused 49%
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • Unattributable adds 660ms and costs ~€7/month
  • www.informa.com adds 654ms and costs ~€7/month
  • transcend-cdn.com adds 265ms 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

Unattributable takes 660ms 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.informa.com takes 654ms 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

67% of www.informa.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

transcend-cdn.com takes 265ms 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

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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