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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
46
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
83
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.
75
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.

8.47 s

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

37.16 s

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

286 ms

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

0.131

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

8.47 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.

37.18 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 3 REVIEW 5 FIX
F
Page Weight Budget
Action
16.2 MB transferred, 75 requests
FIX
16.2 MB transferred, 75 requests
Critical::
Page weighs 20.6 MB (16.2 MB transferred)
Warning::
Images are 14.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 14.2 MB
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Info::
75 HTTP requests
Info::
Estimated 3.4 g CO2 per page load
16.2 MB / 2.4 MB budget
16.2 MB transferred
75 requests
3.4 g CO2 per page load
Images 14.2 MiB 88%
JavaScript 1.4 MiB 9%
Other 250.4 KiB 2%
CSS 156.9 KiB 1%
HTML 75.7 KiB 0%
Fonts 44.1 KiB 0%
Other 1.2 KiB 0%
Other 553 B 0%
Other 546 B 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

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 (16.2 MiB of 16.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5645ms total JS execution
FIX
5645ms total JS execution
Warning::
Unattributable: 1855ms CPU time
Warning::
https://www.imo.org/: 1574ms CPU time
Warning::
https://www.imo.org/Scripts/js/vendors.js: 762ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-465...: 579ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-JG4E...: 272ms CPU time
Warning::
Third-party scripts: 5645ms (100% of total)

Main Thread Breakdown

Other 44% Script Evaluation 30% Style & Layout 13% Script Parsing & Compilation 7% Rendering 3% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable1855ms139ms0ms3rd
https://www.imo.org/1574ms48ms78ms3rd
https://www.imo.org/Scripts/js/vendors.js762ms376ms53ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-465405-9579ms500ms62ms3rd
https://www.googletagmanager.com/gtag/js?id=G-JG4ETTWXS1&cx=c&gtm=4e64k0272ms208ms62ms3rd
https://maps.googleapis.com/maps/api/js?key=AIzaSyCDYY_ECpWhLm56VGe6abMJ8Msj_Nt_8LM213ms146ms56ms3rd
https://connect.facebook.net/en_GB/bundle/sdk.js/189ms122ms66ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js114ms79ms26ms3rd
https://www.google-analytics.com/analytics.js88ms64ms8ms3rd
D
Page Weight Inventory
Action
75 resources · 16.2 MB · 264 KB savings available
FIX
75 resources · 16.2 MB · 264 KB savings available
Warning::
Page weight 15.2 MB over 1MB target
Got: 16.2 MB Expected: ≤ 1 MB
Info::
~264 KB of savings available
Warning::
74 third-party resources (100% of weight)
Info::
20 resources over 200KB
75 resources · 16.2 MiB · 74 third-party 15.2 MiB over 1MB target
Image 89% · 14.5 MiB
JavaScript 9% · 1.4 MiB
CSS 1% · 156.9 KiB
Document 0% · 78.0 KiB
Font 0% · 44.1 KiB
Other 0% · 1.6 KiB

~264.0 KiB of savings available

Remove unused JavaScript: 264.0 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.

C
Image Optimization
Action
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Warning::
https://www.imo.org/Content/images/img/English_Whi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://wwwcdn.imo.org/localresources/en/MediaCent... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://wwwcdn.imo.org/localresources/en/MediaCent... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://wwwcdn.imo.org/localresources/en/MediaCent... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://wwwcdn.imo.org/localresources/en/MediaCent... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
33 images 14.2 MB
0 oversized -0 KB
30 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
JS Bundles
Action
16 scripts, 264 KB unused
REVIEW
16 scripts, 264 KB unused
Warning::
https://maps.googleapis.com/maps/api/js?key=AIzaSy...: 65 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-JG4E...: 63 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-465...: 61 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_GB/bundle/sdk.js/: 54 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ajax.googleapis.com/ajax/libs/jquery/3.4.1...: 22 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 264 KB
264 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://maps.googleapis.com/maps/api/js?key=AIzaSyCDYY_ECpWhLm56VGe6abMJ8Msj_Nt_8LM100 KB65 KB (65%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-JG4ETTWXS1&cx=c&gtm=4e64k0146 KB63 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-465405-9125 KB61 KB (48%)✓3rd
https://connect.facebook.net/en_GB/bundle/sdk.js/78 KB54 KB (70%)✓3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js31 KB22 KB (74%)✓3rd
https://www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js436 KB—✓3rd
https://www.imo.org/scripts/js/fbshare.js1 KB—✓3rd
https://www.imo.org/scripts/js/d3.js73 KB—✓3rd
https://www.imo.org/scripts/js/theme.js3 KB—✓3rd
https://www.imo.org/scripts/js/vendors.js106 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

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 (44 KB)
PASS
2 fonts (44 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

44 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 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s FCP 8.5 s LCP 37.2 shttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 34 ms — font-display: swaphttps://www.imo.org/content/css/fonts/theme-icons.ttf?wu7wi2theme-icons.ttf https://www.imo.org/content/css/fonts/theme-icons.ttf?wu7wi2 — 10.2 KiB — 31 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 34 ms
Start 496 ms
Risk FOUT — text flashes from fallback to web font
theme-icons.ttf ttf swap
Size 10 KB
Load time 31 ms
Start 661 ms
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 ~3 KB and ~6 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
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
Network Waterfall
75 requests over 4240ms
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 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s FCP 8.5 s LCP 37.2 shttps://imo.org// https://imo.org/ — 302 — 99 B — 31 ms — h2https://www.imo.org/www.imo.org/ https://www.imo.org/ — 200 — 18.0 KiB — 180 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js — 200 — 30.7 KiB — 25 ms — h2https://www.googletagmanager.com/gtag/js?id=UA-465405-9www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-465405-9 — 200 — 125.3 KiB — 52 ms — h2https://www.imo.org/Content/css/css/main.css?v=1.2www.imo.org/Content/css/css/main.cs... https://www.imo.org/Content/css/css/main.css?v=1.2 — 301 — 242 B — 23 ms — h2https://www.imo.org/Content/images/img/English_Colour_RGB_Horizontal.pngwww.imo.org/Content/images/img/Engl... https://www.imo.org/Content/images/img/English_Colour_RGB_Horizontal.png — 301 — 257 B — 23 ms — h2https://wwwcdn.imo.org/localresources/en/MediaCentre/WhatsNew/PublishingImages/LEG%20113%20PB_banner%20medium.jpgwwwcdn.imo.org/localresources/en/Me... https://wwwcdn.imo.org/localresources/en/MediaCentre/WhatsNew/PublishingImages/LEG%20113%20PB_banner%20medium.jpg — 200 — 976.7 KiB — 441 ms — h2https://www.imo.org/content/css/css/main.css?v=1.2www.imo.org/content/css/css/main.cs... https://www.imo.org/content/css/css/main.css?v=1.2 — 200 — 53.6 KiB — 40 ms — h2https://www.imo.org/content/images/img/english_colour_rgb_horizontal.pngwww.imo.org/content/images/img/engl... https://www.imo.org/content/images/img/english_colour_rgb_horizontal.png — 200 — 86.5 KiB — 29 ms — h2https://wwwcdn.imo.org/localresources/en/MediaCentre/PublishingImages/HNS%20PB%20Banner_A_medium.jpgwwwcdn.imo.org/localresources/en/Me... https://wwwcdn.imo.org/localresources/en/MediaCentre/PublishingImages/HNS%20PB%20Banner_A_medium.jpg — 200 — 1.7 MiB — 792 ms — h2https://wwwcdn.imo.org/localresources/en/MediaCentre/WhatsNew/PublishingImages/SG%20Statement_medium__%201.jpgwwwcdn.imo.org/localresources/en/Me... https://wwwcdn.imo.org/localresources/en/MediaCentre/WhatsNew/PublishingImages/SG%20Statement_medium__%201.jpg — 200 — 1.3 MiB — 748 ms — h2https://wwwcdn.imo.org/localresources/en/MediaCentre/WhatsNew/PublishingImages/FALConclusion.jpgwwwcdn.imo.org/localresources/en/Me... https://wwwcdn.imo.org/localresources/en/MediaCentre/WhatsNew/PublishingImages/FALConclusion.jpg — 200 — 447.9 KiB — 871 ms — h2https://www.imo.org/Scripts/js/vendors.jswww.imo.org/Scripts/js/vendors.js https://www.imo.org/Scripts/js/vendors.js — 301 — 235 B — 254 ms — h2https://www.imo.org/Scripts/js/theme.jswww.imo.org/Scripts/js/theme.js https://www.imo.org/Scripts/js/theme.js — 301 — 232 B — 255 ms — h2https://maps.googleapis.com/maps/api/js?key=AIzaSyCDYY_ECpWhLm56VGe6abMJ8Msj_Nt_8LMmaps.googleapis.com/maps/api/js?key... https://maps.googleapis.com/maps/api/js?key=AIzaSyCDYY_ECpWhLm56VGe6abMJ8Msj_Nt_8LM — 200 — 100.4 KiB — 101 ms — h2https://www.imo.org/Scripts/js/fbShare.jswww.imo.org/Scripts/js/fbShare.js https://www.imo.org/Scripts/js/fbShare.js — 301 — 236 B — 253 ms — h2https://www.imo.org/Scripts/js/d3.jswww.imo.org/Scripts/js/d3.js https://www.imo.org/Scripts/js/d3.js — 301 — 232 B — 253 ms — h2https://wwwcdn.imo.org/localresources/en/MediaCentre/WhatsNew/PublishingImages/Applications%20Now%20Open_GV_medium.jpgwwwcdn.imo.org/localresources/en/Me... https://wwwcdn.imo.org/localresources/en/MediaCentre/WhatsNew/PublishingImages/Applications%20Now%20Open_GV_medium.jpg — 200 — 1.3 MiB — 912 ms — h2https://wwwcdn.imo.org/localresources/en/MediaCentre/WhatsNew/PublishingImages/Comoros%20launches%20National%20Maritime%20Security%20Committee%20with%20IMO%20support_medium.jpgwwwcdn.imo.org/localresources/en/Me... https://wwwcdn.imo.org/localresources/en/MediaCentre/WhatsNew/PublishingImages/Comoros%20launches%20National%20Maritime%20Security%20Committee%20with%20IMO%20support_medium.jpg — 200 — 1.1 MiB — 876 ms — h2https://wwwcdn.imo.org/localresources/en/MediaCentre/PublishingImages/Vessel%20Image%2002.jpgwwwcdn.imo.org/localresources/en/Me... https://wwwcdn.imo.org/localresources/en/MediaCentre/PublishingImages/Vessel%20Image%2002.jpg — 200 — 2.8 MiB — 949 ms — h2https://wwwcdn.imo.org/localresources/en/MediaCentre/PublishingImages/Middle%20East%20Hot%20Topic%20thumbnail.jpgwwwcdn.imo.org/localresources/en/Me... https://wwwcdn.imo.org/localresources/en/MediaCentre/PublishingImages/Middle%20East%20Hot%20Topic%20thumbnail.jpg — 200 — 251.8 KiB — 431 ms — h2https://wwwcdn.imo.org/localresources/en/MediaCentre/PublishingImages/WMD%202026%20event%20page%20thumbnail.jpgwwwcdn.imo.org/localresources/en/Me... https://wwwcdn.imo.org/localresources/en/MediaCentre/PublishingImages/WMD%202026%20event%20page%20thumbnail.jpg — 200 — 651.6 KiB — 696 ms — h2https://wwwcdn.imo.org/localresources/en/MediaCentre/HotTopics/PublishingImages/SeafarersInformationThumbnail.jpgwwwcdn.imo.org/localresources/en/Me... https://wwwcdn.imo.org/localresources/en/MediaCentre/HotTopics/PublishingImages/SeafarersInformationThumbnail.jpg — 200 — 184.2 KiB — 153 ms — h2https://wwwcdn.imo.org/localresources/en/MediaCentre/PublishingImages/MEPC%20meeting%20thumbnail_EN.jpgwwwcdn.imo.org/localresources/en/Me... https://wwwcdn.imo.org/localresources/en/MediaCentre/PublishingImages/MEPC%20meeting%20thumbnail_EN.jpg — 200 — 615.0 KiB — 850 ms — h2https://wwwcdn.imo.org/localresources/en/PublishingImages/our%20work.jpgwwwcdn.imo.org/localresources/en/Pu... https://wwwcdn.imo.org/localresources/en/PublishingImages/our%20work.jpg — 200 — 509.4 KiB — 771 ms — h2https://wwwcdn.imo.org/localresources/en/PublishingImages/entry-bg1.jpgwwwcdn.imo.org/localresources/en/Pu... https://wwwcdn.imo.org/localresources/en/PublishingImages/entry-bg1.jpg — 200 — 59.0 KiB — 111 ms — h2https://wwwcdn.imo.org/localresources/en/PublishingImages/maritime%20safety.jpgwwwcdn.imo.org/localresources/en/Pu... https://wwwcdn.imo.org/localresources/en/PublishingImages/maritime%20safety.jpg — 200 — 351.1 KiB — 619 ms — h2https://wwwcdn.imo.org/localresources/en/PublishingImages/IMO%20plenary_medium.jpgwwwcdn.imo.org/localresources/en/Pu... https://wwwcdn.imo.org/localresources/en/PublishingImages/IMO%20plenary_medium.jpg — 200 — 488.1 KiB — 695 ms — h2https://wwwcdn.imo.org/localresources/en/PublishingImages/entry-bg3.jpgwwwcdn.imo.org/localresources/en/Pu... https://wwwcdn.imo.org/localresources/en/PublishingImages/entry-bg3.jpg — 200 — 13.2 KiB — 82 ms — h2https://wwwcdn.imo.org/localresources/en/MediaCentre/PublishingImages/OurOceanBackground.jpgwwwcdn.imo.org/localresources/en/Me... https://wwwcdn.imo.org/localresources/en/MediaCentre/PublishingImages/OurOceanBackground.jpg — 200 — 274.5 KiB — 716 ms — h2
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 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s FCP 8.5 s LCP 37.2 shttps://imo.org// https://imo.org/ — 302 — 99 B — 31 ms — h2https://www.imo.org/www.imo.org/ https://www.imo.org/ — 200 — 18.0 KiB — 180 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js — 200 — 30.7 KiB — 25 ms — h2https://www.googletagmanager.com/gtag/js?id=UA-465405-9www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-465405-9 — 200 — 125.3 KiB — 52 ms — h2https://www.imo.org/Content/css/css/main.css?v=1.2www.imo.org/Content/css/css/main.cs... https://www.imo.org/Content/css/css/main.css?v=1.2 — 301 — 242 B — 23 ms — h2https://www.imo.org/Content/images/img/English_Colour_RGB_Horizontal.pngwww.imo.org/Content/images/img/Engl... 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https://wwwcdn.imo.org/localresources/en/MediaCentre/PublishingImages/HNS%20PB%20Banner_A_medium.jpg — 200 — 1.7 MiB — 792 ms — h2https://wwwcdn.imo.org/localresources/en/MediaCentre/WhatsNew/PublishingImages/SG%20Statement_medium__%201.jpgwwwcdn.imo.org/localresources/en/Me... https://wwwcdn.imo.org/localresources/en/MediaCentre/WhatsNew/PublishingImages/SG%20Statement_medium__%201.jpg — 200 — 1.3 MiB — 748 ms — h2https://wwwcdn.imo.org/localresources/en/MediaCentre/WhatsNew/PublishingImages/FALConclusion.jpgwwwcdn.imo.org/localresources/en/Me... https://wwwcdn.imo.org/localresources/en/MediaCentre/WhatsNew/PublishingImages/FALConclusion.jpg — 200 — 447.9 KiB — 871 ms — h2https://www.imo.org/Scripts/js/vendors.jswww.imo.org/Scripts/js/vendors.js https://www.imo.org/Scripts/js/vendors.js — 301 — 235 B — 254 ms — h2https://www.imo.org/Scripts/js/theme.jswww.imo.org/Scripts/js/theme.js https://www.imo.org/Scripts/js/theme.js — 301 — 232 B — 255 ms — 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INFO
100% of JavaScript execution is third-party
First-party Third-party 5645ms · 519KB · £59/mo
Unattributable
Other
Costly
Execution 1855ms
Transfer 0 KB
Monthly Cost £19/mo
www.imo.org
Other
Costly
Execution 1574ms
Transfer 18 KB
Monthly Cost £16/mo
www.imo.org
Other
Costly
Execution 762ms
Transfer 0 KB
Monthly Cost £8/mo
Google Tag Manager
Tag Manager
Costly
Execution 579ms
Transfer 125 KB
Unused 48%
Monthly Cost £6/mo
Google Tag Manager
Tag Manager
Costly
Execution 272ms
Transfer 146 KB
Unused 43%
Monthly Cost £3/mo
maps.googleapis.com
Other
Costly
Execution 213ms
Transfer 100 KB
Unused 65%
Monthly Cost £2/mo
Facebook Pixel
Advertising
Optional
Execution 189ms
Transfer 78 KB
Unused 70%
Monthly Cost £2/mo
ajax.googleapis.com
Other
Optional
Execution 114ms
Transfer 31 KB
Unused 74%
Monthly Cost £1/mo
Google Analytics
Analytics
Optional
Execution 88ms
Transfer 21 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1855ms and costs ~£19/month
  • www.imo.org adds 1574ms and costs ~£16/month
  • www.imo.org adds 762ms and costs ~£8/month
  • Google Tag Manager adds 579ms and costs ~£6/month
  • Google Tag Manager adds 272ms and costs ~£3/month
  • maps.googleapis.com adds 213ms 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.

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 1855ms 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.imo.org takes 1574ms 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.imo.org takes 762ms 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 579ms 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 272ms 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

maps.googleapis.com takes 213ms 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

65% of maps.googleapis.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

70% of Facebook Pixel'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

74% of ajax.googleapis.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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