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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
2
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
95
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

968 ms

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

1.29 s

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

13 ms

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

0.024

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

968 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.77 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
15
7 PASS 4 REVIEW 2 FIX
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 (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
34 resources · 1.7 MB · 150 KB savings available
FIX
34 resources · 1.7 MB · 150 KB savings available
Warning::
Page weight 690 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~150 KB of savings available
Warning::
33 third-party resources (100% of weight)
Info::
1 resources over 200KB
34 resources · 1.7 MiB · 33 third-party 690.4 KiB over 1MB target
Image 68% · 1.1 MiB
JavaScript 20% · 347.8 KiB
Document 4% · 74.8 KiB
Font 4% · 70.9 KiB
CSS 3% · 45.7 KiB
Other 0% · 984 B

~150.1 KiB of savings available

Remove unused JavaScript: 150.1 KiB
C
Page Weight Budget
Action
1.7 MB transferred, 34 requests
REVIEW
1.7 MB transferred, 34 requests
Info::
Page weighs 3.2 MB (1.7 MB transferred)
Info::
34 HTTP requests
Info::
Estimated 0.35 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
34 requests
0.35 g CO2 per page load
Images 983.3 KiB 57%
JavaScript 347.8 KiB 20%
Other 191.3 KiB 11%
Fonts 70.9 KiB 4%
CSS 45.7 KiB 3%
Other 43.7 KiB 3%
HTML 31.1 KiB 2%
Other 547 B 0%
0 2.4 MB 4.9 MB
Approaching limit
B
Image Optimization
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Warning::
https://www.osce.org/themes/custom/osce2/logo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
9 images 983 KB
0 oversized -0 KB
9 legacy format
1 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

B
JS Execution Cost
653ms total JS execution
REVIEW
653ms total JS execution
Warning::
Unattributable: 447ms CPU time
Info::
https://www.osce.org/: 129ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-EF6Z...: 77ms CPU time
Warning::
Third-party scripts: 653ms (100% of total)

Main Thread Breakdown

Style & Layout 46% Script Evaluation 20% Other 20% Script Parsing & Compilation 4% Garbage Collection 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable447ms3ms0ms3rd
https://www.osce.org/129ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-EF6ZNRJB6C&cx=c&gtm=4e64k077ms61ms16ms3rd
C
JS Bundles
Action
11 scripts, 150 KB unused
REVIEW
11 scripts, 150 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-EF6Z...: 64 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W9L...: 61 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.osce.org/core/assets/vendor/jquery/jqu...: 25 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 150 KB
150 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-EF6ZNRJB6C&cx=c&gtm=4e64k0152 KB64 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W9L242122 KB61 KB (50%)✓3rd
https://www.osce.org/core/assets/vendor/jquery/jquery.min.js?v=4.0.032 KB25 KB (79%)✓3rd
https://www.osce.org/sites/default/files/js/js__9SZLawoKjDVVit5tG4M24dH27QwUy8kJc5qoUsQ_ZA.js?scope=header&delta=0&language=en&theme=osce2&include=eJxdjFEKwkAMRC9Uu-CFQrpNY8puUjbpqrdXahH0Z3jzGAYloQAXm7AMbMaFIJATv-O_j7ji41fWoUo2TUeO3nkwz3RNWDZRAtGg5pTj1NRJ4-KBsfupNmQ60QlbvsFirR4GlmbvA51TkU6gdocJZybo4jJJkXh-dpV0T1-Cda_bC7eOUwI1 KB—✓3rd
https://www.osce.org/modules/contrib/google_tag/js/gtag.js?tdlgeh1 KB—✓3rd
https://www.osce.org/modules/contrib/google_tag/js/gtm.js?tdlgeh1 KB—✓3rd
https://www.osce.org/sites/default/files/js/js_t6xbo5trByokRrdD35zi71prkr5dkj21chigS9gdFiU.js?scope=header&delta=4&language=en&theme=osce2&include=eJxdjFEKwkAMRC9Uu-CFQrpNY8puUjbpqrdXahH0Z3jzGAYloQAXm7AMbMaFIJATv-O_j7ji41fWoUo2TUeO3nkwz3RNWDZRAtGg5pTj1NRJ4-KBsfupNmQ60QlbvsFirR4GlmbvA51TkU6gdocJZybo4jJJkXh-dpV0T1-Cda_bC7eOUwI2 KB—✓3rd
https://www.osce.org/sites/default/files/js/js_aZK269W8CeVg9cnpYm_vEdnYW5tAGUtD7cj17-crNVc.js?scope=header&delta=6&language=en&theme=osce2&include=eJxdjFEKwkAMRC9Uu-CFQrpNY8puUjbpqrdXahH0Z3jzGAYloQAXm7AMbMaFIJATv-O_j7ji41fWoUo2TUeO3nkwz3RNWDZRAtGg5pTj1NRJ4-KBsfupNmQ60QlbvsFirR4GlmbvA51TkU6gdocJZybo4jJJkXh-dpV0T1-Cda_bC7eOUwI1 KB—✓3rd
https://www.osce.org/sites/default/files/js/js_WExPhOAK2ZYrKjwLjMLjoMmlNi9cV2HYcT2wwnj77G0.js?scope=footer&delta=1&language=en&theme=osce2&include=eJxdjFEKwkAMRC9Uu-CFQrpNY8puUjbpqrdXahH0Z3jzGAYloQAXm7AMbMaFIJATv-O_j7ji41fWoUo2TUeO3nkwz3RNWDZRAtGg5pTj1NRJ4-KBsfupNmQ60QlbvsFirR4GlmbvA51TkU6gdocJZybo4jJJkXh-dpV0T1-Cda_bC7eOUwI16 KB—✓3rd
https://www.osce.org/themes/contrib/storybook/dist/assets/scripts/alpineIntersect.min.js?tdlgeh1 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

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 (71 KB)
PASS
2 fonts (71 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

71 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 500 ms 1.0 s FCP 968 ms LCP 1.3 shttps://www.osce.org/themes/contrib/storybook/dist/assets/fonts/hkgrotesk/HKGrotesk-Regular.woff2HKGrotesk-Regular.woff2 https://www.osce.org/themes/contrib/storybook/dist/assets/fonts/hkgrotesk/HKGrotesk-Regular.woff2 — 34.6 KiB — 24 ms — font-display: swaphttps://www.osce.org/themes/contrib/storybook/dist/assets/fonts/hkgrotesk/HKGrotesk-Bold.woff2HKGrotesk-Bold.woff2 https://www.osce.org/themes/contrib/storybook/dist/assets/fonts/hkgrotesk/HKGrotesk-Bold.woff2 — 36.3 KiB — 25 ms — font-display: swap
HKGrotesk-Regular.woff2 woff2 swap
Size 35 KB
Load time 24 ms
Start 434 ms
Risk FOUT — text flashes from fallback to web font
HKGrotesk-Bold.woff2 woff2 swap
Size 36 KB
Load time 25 ms
Start 470 ms
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: Link11 GmbH

A
HTTP Caching
max-age=86400 (1 day)
PASS
max-age=86400 (1 day)
Info::
Cache-Control header is set
Got: max-age=86400
Info::
Effective TTL: 1 day (max-age=86400)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=86400

DirectiveValueMeaning
max-age86400Cache for 1 day
Effective TTL: 86400 seconds
Network Waterfall
34 requests over 1129ms
INFO
0 ms 500 ms 1.0 s FCP 968 ms LCP 1.3 shttps://osce.org// https://osce.org/ — 301 — 437 B — 135 ms — http/1.1https://www.osce.org/www.osce.org/ https://www.osce.org/ — 200 — 31.1 KiB — 93 ms — http/1.1https://www.osce.org/sites/default/files/css/css_uSlrj7LCd-38akPQly9oD852t8RjAOD-e0TISI-J4iw.css?delta=0&language=en&theme=osce2&include=eJxVjlEKwyAQRC9ks9ALyaobtV1dcbVpbl-aUEp-HsxjGAYzYLaRxSEbL50g9NmQF3zg2zDuMocNWb28qO8glbywKdlLhYPLyhgv4gsj6ukO5-7Nqx7Crl3qoBrAD7QJebVbDiPZXDDSWdmkPx1Vn-AaTcOOsWNL-rv4N8usbTrOmigY3XVQAYdK5pVpUzi4FAmT6QPO9V1xwww.osce.org/sites/default/files/cs... https://www.osce.org/sites/default/files/css/css_uSlrj7LCd-38akPQly9oD852t8RjAOD-e0TISI-J4iw.css?delta=0&language=en&theme=osce2&include=eJxVjlEKwyAQRC9ks9ALyaobtV1dcbVpbl-aUEp-HsxjGAYzYLaRxSEbL50g9NmQF3zg2zDuMocNWb28qO8glbywKdlLhYPLyhgv4gsj6ukO5-7Nqx7Crl3qoBrAD7QJebVbDiPZXDDSWdmkPx1Vn-AaTcOOsWNL-rv4N8usbTrOmigY3XVQAYdK5pVpUzi4FAmT6QPO9V1x — 200 — 3.3 KiB — 16 ms — http/1.1https://www.osce.org/sites/default/files/css/css_81Qo3OI2J64MsOJ-IACB0LHkL20WOm8wOnZcGLtB4Xo.css?delta=1&language=en&theme=osce2&include=eJxVjlEKwyAQRC9ks9ALyaobtV1dcbVpbl-aUEp-HsxjGAYzYLaRxSEbL50g9NmQF3zg2zDuMocNWb28qO8glbywKdlLhYPLyhgv4gsj6ukO5-7Nqx7Crl3qoBrAD7QJebVbDiPZXDDSWdmkPx1Vn-AaTcOOsWNL-rv4N8usbTrOmigY3XVQAYdK5pVpUzi4FAmT6QPO9V1xwww.osce.org/sites/default/files/cs... https://www.osce.org/sites/default/files/css/css_81Qo3OI2J64MsOJ-IACB0LHkL20WOm8wOnZcGLtB4Xo.css?delta=1&language=en&theme=osce2&include=eJxVjlEKwyAQRC9ks9ALyaobtV1dcbVpbl-aUEp-HsxjGAYzYLaRxSEbL50g9NmQF3zg2zDuMocNWb28qO8glbywKdlLhYPLyhgv4gsj6ukO5-7Nqx7Crl3qoBrAD7QJebVbDiPZXDDSWdmkPx1Vn-AaTcOOsWNL-rv4N8usbTrOmigY3XVQAYdK5pVpUzi4FAmT6QPO9V1x — 200 — 42.4 KiB — 33 ms — http/1.1https://www.osce.org/sites/default/files/js/js__9SZLawoKjDVVit5tG4M24dH27QwUy8kJc5qoUsQ_ZA.js?scope=header&delta=0&language=en&theme=osce2&include=eJxdjFEKwkAMRC9Uu-CFQrpNY8puUjbpqrdXahH0Z3jzGAYloQAXm7AMbMaFIJATv-O_j7ji41fWoUo2TUeO3nkwz3RNWDZRAtGg5pTj1NRJ4-KBsfupNmQ60QlbvsFirR4GlmbvA51TkU6gdocJZybo4jJJkXh-dpV0T1-Cda_bC7eOUwIwww.osce.org/sites/default/files/js... https://www.osce.org/sites/default/files/js/js__9SZLawoKjDVVit5tG4M24dH27QwUy8kJc5qoUsQ_ZA.js?scope=header&delta=0&language=en&theme=osce2&include=eJxdjFEKwkAMRC9Uu-CFQrpNY8puUjbpqrdXahH0Z3jzGAYloQAXm7AMbMaFIJATv-O_j7ji41fWoUo2TUeO3nkwz3RNWDZRAtGg5pTj1NRJ4-KBsfupNmQ60QlbvsFirR4GlmbvA51TkU6gdocJZybo4jJJkXh-dpV0T1-Cda_bC7eOUwI — 200 — 1018 B — 90 ms — http/1.1https://www.osce.org/modules/contrib/google_tag/js/gtag.js?tdlgehwww.osce.org/modules/contrib/google... https://www.osce.org/modules/contrib/google_tag/js/gtag.js?tdlgeh — 200 — 1.4 KiB — 91 ms — http/1.1https://www.osce.org/modules/contrib/google_tag/js/gtm.js?tdlgehwww.osce.org/modules/contrib/google... https://www.osce.org/modules/contrib/google_tag/js/gtm.js?tdlgeh — 200 — 1.3 KiB — 48 ms — http/1.1https://www.osce.org/sites/default/files/js/js_t6xbo5trByokRrdD35zi71prkr5dkj21chigS9gdFiU.js?scope=header&delta=4&language=en&theme=osce2&include=eJxdjFEKwkAMRC9Uu-CFQrpNY8puUjbpqrdXahH0Z3jzGAYloQAXm7AMbMaFIJATv-O_j7ji41fWoUo2TUeO3nkwz3RNWDZRAtGg5pTj1NRJ4-KBsfupNmQ60QlbvsFirR4GlmbvA51TkU6gdocJZybo4jJJkXh-dpV0T1-Cda_bC7eOUwIwww.osce.org/sites/default/files/js... https://www.osce.org/sites/default/files/js/js_t6xbo5trByokRrdD35zi71prkr5dkj21chigS9gdFiU.js?scope=header&delta=4&language=en&theme=osce2&include=eJxdjFEKwkAMRC9Uu-CFQrpNY8puUjbpqrdXahH0Z3jzGAYloQAXm7AMbMaFIJATv-O_j7ji41fWoUo2TUeO3nkwz3RNWDZRAtGg5pTj1NRJ4-KBsfupNmQ60QlbvsFirR4GlmbvA51TkU6gdocJZybo4jJJkXh-dpV0T1-Cda_bC7eOUwI — 200 — 2.0 KiB — 61 ms — http/1.1https://www.osce.org/sites/default/files/js/js_aZK269W8CeVg9cnpYm_vEdnYW5tAGUtD7cj17-crNVc.js?scope=header&delta=6&language=en&theme=osce2&include=eJxdjFEKwkAMRC9Uu-CFQrpNY8puUjbpqrdXahH0Z3jzGAYloQAXm7AMbMaFIJATv-O_j7ji41fWoUo2TUeO3nkwz3RNWDZRAtGg5pTj1NRJ4-KBsfupNmQ60QlbvsFirR4GlmbvA51TkU6gdocJZybo4jJJkXh-dpV0T1-Cda_bC7eOUwIwww.osce.org/sites/default/files/js... https://www.osce.org/sites/default/files/js/js_aZK269W8CeVg9cnpYm_vEdnYW5tAGUtD7cj17-crNVc.js?scope=header&delta=6&language=en&theme=osce2&include=eJxdjFEKwkAMRC9Uu-CFQrpNY8puUjbpqrdXahH0Z3jzGAYloQAXm7AMbMaFIJATv-O_j7ji41fWoUo2TUeO3nkwz3RNWDZRAtGg5pTj1NRJ4-KBsfupNmQ60QlbvsFirR4GlmbvA51TkU6gdocJZybo4jJJkXh-dpV0T1-Cda_bC7eOUwI — 200 — 1.0 KiB — 106 ms — http/1.1https://www.osce.org/themes/custom/osce2/logo.svgwww.osce.org/themes/custom/osce2/lo... https://www.osce.org/themes/custom/osce2/logo.svg — 200 — 4.4 KiB — 39 ms — http/1.1https://www.osce.org/sites/default/files/styles/header_full/public/2025-01/19.jpg?h=3b262c90&itok=0dXYiH8Fwww.osce.org/sites/default/files/st... https://www.osce.org/sites/default/files/styles/header_full/public/2025-01/19.jpg?h=3b262c90&itok=0dXYiH8F — 200 — 75.9 KiB — 27 ms — http/1.1https://www.osce.org/sites/default/files/styles/container_full_1x_uncropped/public/2025-11/Map_OSCE-Region.gif?itok=oj-xSTFvwww.osce.org/sites/default/files/st... https://www.osce.org/sites/default/files/styles/container_full_1x_uncropped/public/2025-11/Map_OSCE-Region.gif?itok=oj-xSTFv — 200 — 44.3 KiB — 41 ms — http/1.1https://www.osce.org/core/assets/vendor/jquery/jquery.min.js?v=4.0.0www.osce.org/core/assets/vendor/jqu... https://www.osce.org/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 — 200 — 32.1 KiB — 29 ms — http/1.1https://www.osce.org/sites/default/files/js/js_WExPhOAK2ZYrKjwLjMLjoMmlNi9cV2HYcT2wwnj77G0.js?scope=footer&delta=1&language=en&theme=osce2&include=eJxdjFEKwkAMRC9Uu-CFQrpNY8puUjbpqrdXahH0Z3jzGAYloQAXm7AMbMaFIJATv-O_j7ji41fWoUo2TUeO3nkwz3RNWDZRAtGg5pTj1NRJ4-KBsfupNmQ60QlbvsFirR4GlmbvA51TkU6gdocJZybo4jJJkXh-dpV0T1-Cda_bC7eOUwIwww.osce.org/sites/default/files/js... https://www.osce.org/sites/default/files/js/js_WExPhOAK2ZYrKjwLjMLjoMmlNi9cV2HYcT2wwnj77G0.js?scope=footer&delta=1&language=en&theme=osce2&include=eJxdjFEKwkAMRC9Uu-CFQrpNY8puUjbpqrdXahH0Z3jzGAYloQAXm7AMbMaFIJATv-O_j7ji41fWoUo2TUeO3nkwz3RNWDZRAtGg5pTj1NRJ4-KBsfupNmQ60QlbvsFirR4GlmbvA51TkU6gdocJZybo4jJJkXh-dpV0T1-Cda_bC7eOUwI — 200 — 16.2 KiB — 35 ms — http/1.1https://www.osce.org/themes/contrib/storybook/dist/assets/scripts/alpineIntersect.min.js?tdlgehwww.osce.org/themes/contrib/storybo... https://www.osce.org/themes/contrib/storybook/dist/assets/scripts/alpineIntersect.min.js?tdlgeh — 200 — 1.3 KiB — 17 ms — 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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 653ms · 183KB · $9/mo
Unattributable
Other
Costly
Execution 447ms
Transfer 0 KB
Monthly Cost $6/mo
www.osce.org
Other
Optional
Execution 129ms
Transfer 31 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 77ms
Transfer 152 KB
Unused 42%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 447ms and costs ~$6/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 447ms 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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