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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
58
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
71
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

3.08 s

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

7.61 s

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

422 ms

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

0.054

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

3.95 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.

9.06 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
8.4 MB transferred, 106 requests
FIX
8.4 MB transferred, 106 requests
Critical::
Page weighs 9.8 MB (8.4 MB transferred)
Warning::
Images are 7.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 7.6 MB
Warning::
JavaScript is 583 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 583 KB
Warning::
106 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.8 g CO2 per page load
8.4 MB / 2.4 MB budget
8.4 MB transferred
106 requests
1.8 g CO2 per page load
Images 7.6 MiB 91%
JavaScript 583.1 KiB 7%
Fonts 121.5 KiB 1%
CSS 41.3 KiB 0%
HTML 12.3 KiB 0%
Other 1.2 KiB 0%
Other 824 B 0%
Other 655 B 0%
Other 555 B 0%
Other 546 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (8.4 MiB of 8.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3331ms total JS execution
FIX
3331ms total JS execution
Warning::
https://www.ipcc.ch/: 1113ms CPU time
Warning::
https://www.ipcc.ch/site/wp-includes/js/jquery/jqu...: 764ms CPU time
Warning::
Unattributable: 645ms CPU time
Warning::
https://www.ipcc.ch/site/assets/themes/ipcc/resour...: 321ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-97J7...: 221ms CPU time
Warning::
Third-party scripts: 3331ms (100% of total)

Main Thread Breakdown

Style & Layout 34% Script Evaluation 29% Other 26% Script Parsing & Compilation 5% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.ipcc.ch/1113ms4ms2ms3rd
https://www.ipcc.ch/site/wp-includes/js/jquery/jquery.js?ver=1.12.4-wp764ms386ms8ms3rd
Unattributable645ms64ms0ms3rd
https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/amcharts3/amcharts/amcharts.js321ms104ms19ms3rd
https://www.googletagmanager.com/gtag/js?id=G-97J7HJ28MR&cx=c&gtm=4e64h1221ms169ms46ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-168918890-1175ms129ms36ms3rd
https://connect.facebook.net/en_US/bundle/sdk.js/91ms70ms21ms3rd
D
Page Weight Inventory
Action
106 resources · 8.4 MB · 239 KB savings available
FIX
106 resources · 8.4 MB · 239 KB savings available
Warning::
Page weight 7.4 MB over 1MB target
Got: 8.4 MB Expected: ≤ 1 MB
Info::
~239 KB of savings available
Warning::
105 third-party resources (100% of weight)
Info::
8 resources over 200KB
106 resources · 8.4 MiB · 105 third-party 7.4 MiB over 1MB target
Image 91% · 7.6 MiB
JavaScript 7% · 583.1 KiB
Font 1% · 121.5 KiB
CSS 0% · 41.3 KiB
Document 0% · 13.1 KiB
Other 0% · 1.9 KiB

~238.8 KiB of savings available

Remove unused JavaScript: 238.8 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
52 images, 0 KB saveable
REVIEW
52 images, 0 KB saveable
Warning::
https://www.ipcc.ch/site/assets/themes/ipcc/resour... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ipcc.ch/site/assets/themes/ipcc/resour... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ipcc.ch/site/assets/themes/ipcc/resour... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
52 images 7.6 MB
0 oversized -0 KB
52 legacy format
3 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

C
JS Bundles
Action
31 scripts, 239 KB unused
REVIEW
31 scripts, 239 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-97J7...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-168...: 63 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ipcc.ch/site/assets/themes/ipcc/resour...: 57 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/bundle/sdk.js/: 54 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 239 KB
239 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-97J7HJ28MR&cx=c&gtm=4e64h1159 KB65 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-168918890-1125 KB63 KB (51%)✓3rd
https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/amcharts3/amcharts/amcharts.js64 KB57 KB (89%)✓3rd
https://connect.facebook.net/en_US/bundle/sdk.js/78 KB54 KB (69%)✓3rd
https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/isotope-packery/packery-mode.pkgd.min.js5 KB—✓3rd
https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/sticky-kit/jquery.sticky-kit.min.js2 KB—✓3rd
https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-nav-overlay/nav-overlay.js1 KB—✓3rd
https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-social-widget/follow-widget.js2 KB—✓3rd
https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-social-widget/share-widget.js2 KB—✓3rd
https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-borderize/borderize.js1 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 (121 KB)
PASS
5 fonts (121 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

121 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 3.1 s LCP 7.6 shttps://www.ipcc.ch/site/assets/themes/ipcc/resources/fonts/IPCCIcons.ttf?gxqzazIPCCIcons.ttf https://www.ipcc.ch/site/assets/themes/ipcc/resources/fonts/IPCCIcons.ttf?gxqzaz — 4.3 KiB — 59 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 — 41 ms — font-display: swaphttps://www.ipcc.ch/site/assets/themes/ipcc/resources/fonts/ipccsans-medium-webfont.woff2ipccsans-medium-webfont... https://www.ipcc.ch/site/assets/themes/ipcc/resources/fonts/ipccsans-medium-webfont.woff2 — 21.9 KiB — 107 ms — font-display: swaphttps://www.ipcc.ch/site/assets/themes/ipcc/resources/fonts/ipccsans-regular-webfont.woff2ipccsans-regular-webfon... https://www.ipcc.ch/site/assets/themes/ipcc/resources/fonts/ipccsans-regular-webfont.woff2 — 21.8 KiB — 102 ms — font-display: swaphttps://www.ipcc.ch/site/assets/themes/ipcc/resources/fonts/ipccserif-regular-webfont.woff2ipccserif-regular-webfo... https://www.ipcc.ch/site/assets/themes/ipcc/resources/fonts/ipccserif-regular-webfont.woff2 — 28.5 KiB — 103 ms — font-display: swap
IPCCIcons.ttf ttf swap
Size 4 KB
Load time 59 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
ieVl2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 45 KB
Load time 41 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
ipccsans-medium-webfont... woff2 swap
Size 22 KB
Load time 107 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
ipccsans-regular-webfon... woff2 swap
Size 22 KB
Load time 102 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
ipccserif-regular-webfo... woff2 swap
Size 28 KB
Load time 103 ms
Start 1.2 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)

Fixing the unchecked items could save ~1 KB and ~2 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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
1
prefetch
—

1 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: Cloudflare

Network Waterfall
106 requests over 1871ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 3.1 s LCP 7.6 shttps://ipcc.ch// https://ipcc.ch/ — 301 — 213 B — 96 ms — h2http://www.ipcc.ch/www.ipcc.ch/ http://www.ipcc.ch/ — 307 — 0 B — 2 ms — http/1.1https://www.ipcc.ch/www.ipcc.ch/ https://www.ipcc.ch/ — 200 — 12.3 KiB — 797 ms — h2https://www.googletagmanager.com/gtag/js?id=UA-168918890-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-168918890-1 — 200 — 125.4 KiB — 154 ms — h2https://www.ipcc.ch/site/wp-includes/css/dist/block-library/style.min.css?ver=5.3.15www.ipcc.ch/site/wp-includes/css/di... https://www.ipcc.ch/site/wp-includes/css/dist/block-library/style.min.css?ver=5.3.15 — 200 — 6.2 KiB — 32 ms — h2https://www.ipcc.ch/site/assets/plugins/contact-form-7/includes/css/styles.css?ver=5.0.5www.ipcc.ch/site/assets/plugins/con... https://www.ipcc.ch/site/assets/plugins/contact-form-7/includes/css/styles.css?ver=5.0.5 — 200 — 781 B — 29 ms — h2https://www.ipcc.ch/site/assets/themes/ipcc/style.csswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/style.css — 200 — 260 B — 33 ms — h2https://www.ipcc.ch/site/assets/plugins/tablepress/css/default.min.css?ver=1.9.1www.ipcc.ch/site/assets/plugins/tab... https://www.ipcc.ch/site/assets/plugins/tablepress/css/default.min.css?ver=1.9.1 — 200 — 2.8 KiB — 30 ms — h2https://www.ipcc.ch/site/wp-includes/js/jquery/jquery.js?ver=1.12.4-wpwww.ipcc.ch/site/wp-includes/js/jqu... https://www.ipcc.ch/site/wp-includes/js/jquery/jquery.js?ver=1.12.4-wp — 200 — 34.2 KiB — 51 ms — h2https://www.ipcc.ch/site/wp-includes/js/jquery/jquery-migrate.min.js?ver=1.4.1www.ipcc.ch/site/wp-includes/js/jqu... https://www.ipcc.ch/site/wp-includes/js/jquery/jquery-migrate.min.js?ver=1.4.1 — 200 — 4.2 KiB — 59 ms — h2https://www.ipcc.ch/site/assets/themes/ipcc/resources/img/favicon/site.webmanifestwww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/img/favicon/site.webmanifest — 200 — 824 B — 70 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/img/splash_logos.pngwww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/img/splash_logos.png — 200 — 38.4 KiB — 34 ms — h2https://www.ipcc.ch/site/assets/themes/ipcc/resources/css/screen.csswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/css/screen.css — 200 — 21.6 KiB — 77 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/css/mods.csswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/css/mods.css — 200 — 300 B — 29 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/img/footer_logos.pngwww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/img/footer_logos.png — 200 — 18.3 KiB — 67 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/img/h7.pngwww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/img/h7.png — 200 — 5.1 KiB — 38 ms — h3https://www.ipcc.ch/site/assets/plugins/contact-form-7/includes/js/scripts.js?ver=5.0.5www.ipcc.ch/site/assets/plugins/con... https://www.ipcc.ch/site/assets/plugins/contact-form-7/includes/js/scripts.js?ver=5.0.5 — 200 — 4.4 KiB — 28 ms — h3https://fonts.googleapis.com/css?family=Roboto+Condensed:400,700fonts.googleapis.com/css?family=Rob... https://fonts.googleapis.com/css?family=Roboto+Condensed:400,700 — 200 — 1.1 KiB — 94 ms — h2https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/normalize-css/normalize.csswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/normalize-css/normalize.css — 200 — 2.3 KiB — 29 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/gridtab/gridtab/gridtab.min.csswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/gridtab/gridtab/gridtab.min.css — 200 — 926 B — 27 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/amcharts3-export/export.csswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/amcharts3-export/export.css — 200 — 5.1 KiB — 30 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/js-cookie/src/js.cookie.jswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/js-cookie/src/js.cookie.js — 200 — 1.7 KiB — 30 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-window-spec/window-spec.min.jswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-window-spec/window-spec.min.js — 200 — 416 B — 27 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-nav-overlay/nav-overlay.jswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-nav-overlay/nav-overlay.js — 200 — 1.1 KiB — 32 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-social-widget/follow-widget.jswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-social-widget/follow-widget.js — 200 — 1.7 KiB — 30 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-social-widget/share-widget.jswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-social-widget/share-widget.js — 200 — 2.4 KiB — 29 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-borderize/borderize.jswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-borderize/borderize.js — 200 — 852 B — 34 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-smooth-scroll/smooth-scroll.jswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-smooth-scroll/smooth-scroll.js — 200 — 1.0 KiB — 34 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-equalizer/equalizer.min.jswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/pe-equalizer/equalizer.min.js — 200 — 649 B — 35 ms — h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/slick-carousel/slick/slick.min.jswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/bower_components/slick-carousel/slick/slick.min.js — 200 — 11.0 KiB — 83 ms — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 3.1 s LCP 7.6 shttps://ipcc.ch// https://ipcc.ch/ — 301 — 213 B — 96 ms — h2http://www.ipcc.ch/www.ipcc.ch/ http://www.ipcc.ch/ — 307 — 0 B — 2 ms — http/1.1https://www.ipcc.ch/www.ipcc.ch/ https://www.ipcc.ch/ — 200 — 12.3 KiB — 797 ms — h2https://www.googletagmanager.com/gtag/js?id=UA-168918890-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-168918890-1 — 200 — 125.4 KiB — 154 ms — h2https://www.ipcc.ch/site/wp-includes/css/dist/block-library/style.min.css?ver=5.3.15www.ipcc.ch/site/wp-includes/css/di... https://www.ipcc.ch/site/wp-includes/css/dist/block-library/style.min.css?ver=5.3.15 — 200 — 6.2 KiB — 32 ms — h2https://www.ipcc.ch/site/assets/plugins/contact-form-7/includes/css/styles.css?ver=5.0.5www.ipcc.ch/site/assets/plugins/con... https://www.ipcc.ch/site/assets/plugins/contact-form-7/includes/css/styles.css?ver=5.0.5 — 200 — 781 B — 29 ms — h2https://www.ipcc.ch/site/assets/themes/ipcc/style.csswww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/style.css — 200 — 260 B — 33 ms — h2https://www.ipcc.ch/site/assets/plugins/tablepress/css/default.min.css?ver=1.9.1www.ipcc.ch/site/assets/plugins/tab... https://www.ipcc.ch/site/assets/plugins/tablepress/css/default.min.css?ver=1.9.1 — 200 — 2.8 KiB — 30 ms — h2https://www.ipcc.ch/site/wp-includes/js/jquery/jquery.js?ver=1.12.4-wpwww.ipcc.ch/site/wp-includes/js/jqu... https://www.ipcc.ch/site/wp-includes/js/jquery/jquery.js?ver=1.12.4-wp — 200 — 34.2 KiB — 51 ms — h2https://www.ipcc.ch/site/wp-includes/js/jquery/jquery-migrate.min.js?ver=1.4.1www.ipcc.ch/site/wp-includes/js/jqu... https://www.ipcc.ch/site/wp-includes/js/jquery/jquery-migrate.min.js?ver=1.4.1 — 200 — 4.2 KiB — 59 ms — h2https://www.ipcc.ch/site/assets/themes/ipcc/resources/img/favicon/site.webmanifestwww.ipcc.ch/site/assets/themes/ipcc... 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h3https://www.ipcc.ch/site/assets/themes/ipcc/resources/img/favicon/favicon.icowww.ipcc.ch/site/assets/themes/ipcc... https://www.ipcc.ch/site/assets/themes/ipcc/resources/img/favicon/favicon.ico — 200 — 1.0 KiB — 24 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 3331ms · 473KB · CHF53/mo
www.ipcc.ch
Other
Costly
Execution 1113ms
Transfer 12 KB
Monthly Cost CHF18/mo
www.ipcc.ch
Other
Costly
Execution 764ms
Transfer 34 KB
Monthly Cost CHF12/mo
Unattributable
Other
Costly
Execution 645ms
Transfer 0 KB
Monthly Cost CHF10/mo
www.ipcc.ch
Other
Costly
Execution 321ms
Transfer 64 KB
Unused 89%
Monthly Cost CHF5/mo
Google Tag Manager
Tag Manager
Costly
Execution 221ms
Transfer 159 KB
Unused 41%
Monthly Cost CHF3/mo
Google Tag Manager
Tag Manager
Optional
Execution 175ms
Transfer 125 KB
Unused 51%
Monthly Cost CHF3/mo
Facebook Pixel
Advertising
Optional
Execution 91ms
Transfer 78 KB
Unused 69%
Monthly Cost CHF1/mo

These scripts may cost more than they're worth

  • www.ipcc.ch adds 1113ms and costs ~CHF18/month
  • www.ipcc.ch adds 764ms and costs ~CHF12/month
  • Unattributable adds 645ms and costs ~CHF10/month
  • www.ipcc.ch adds 321ms and costs ~CHF5/month
  • Google Tag Manager adds 221ms and costs ~CHF3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.ipcc.ch takes 1113ms 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.ipcc.ch takes 764ms 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 645ms 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.ipcc.ch takes 321ms 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

89% of www.ipcc.ch'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 221ms 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

51% of Google Tag Manager'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

69% 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

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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