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https://astrazeneca.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
61
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.
100
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.

1.41 s

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

2.02 s

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

0 ms

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

0.901

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

1.44 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.

2.06 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
15
6 PASS 4 REVIEW 3 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
53 resources · 1.7 MB · 218 KB savings available
FIX
53 resources · 1.7 MB · 218 KB savings available
Warning::
Page weight 687 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~218 KB of savings available
Warning::
52 third-party resources (100% of weight)
Info::
1 resources over 200KB
53 resources · 1.7 MiB · 52 third-party 686.5 KiB over 1MB target
Image 61% · 1.0 MiB
JavaScript 23% · 395.4 KiB
Font 9% · 148.9 KiB
CSS 6% · 98.9 KiB
Document 1% · 15.4 KiB
Other 0% · 2.4 KiB

~218.1 KiB of savings available

Remove unused JavaScript: 218.1 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
Page Weight Budget
Action
1.7 MB transferred, 53 requests
REVIEW
1.7 MB transferred, 53 requests
Info::
Page weighs 3.6 MB (1.7 MB transferred)
Warning::
Images are 1.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.0 MB
Info::
53 HTTP requests
Info::
Estimated 0.35 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
53 requests
0.35 g CO2 per page load
Images 1.0 MiB 61%
JavaScript 395.4 KiB 23%
Fonts 148.9 KiB 9%
CSS 98.9 KiB 6%
HTML 15.0 KiB 1%
Other 8.6 KiB 1%
Other 2.4 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

B
Image Optimization
25 images, 0 KB saveable
REVIEW
25 images, 0 KB saveable
Warning::
https://www.astrazeneca.com/content/dam/az/wscd/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
25 images 1.0 MB
0 oversized -0 KB
13 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

C
JS Bundles
Action
11 scripts, 218 KB unused
REVIEW
11 scripts, 218 KB unused
Warning::
https://www.astrazeneca.com/etc/designs/az/js/inde...: 194 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tags.tiqcdn.com/utag/astrazeneca/global-az...: 25 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 218 KB
218 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.astrazeneca.com/etc/designs/az/js/index.min.js252 KB194 KB (77%)✓3rd
https://tags.tiqcdn.com/utag/astrazeneca/global-az-com/prod/utag.js35 KB25 KB (71%)✓3rd
https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/rum-standalone.js3 KB—✓3rd
https://www.astrazeneca.com/etc/designs/common/js/lib/modernizr.min.js10 KB—✓3rd
https://policy.cookiereports.com/510df253_panel-en-gb.js29 KB—✓3rd
https://code.jquery.com/jquery-3.5.0.min.js31 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/jquery-migrate/3.2.0/jquery-migrate.min.js4 KB—✓3rd
https://tags.tiqcdn.com/utag/astrazeneca/global-az-com/prod/utag.sync.js1 KB—✓3rd
https://www.astrazeneca.com/etc/designs/common/js/lang/en_GB.min.js1 KB—✓3rd
https://policy.cookiereports.com/j/jquery.min.js30 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

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+
JS Execution Cost
340ms total JS execution
PASS
340ms total JS execution
Info::
https://www.astrazeneca.com/: 142ms CPU time
Info::
https://www.astrazeneca.com/etc/designs/az/js/inde...: 84ms CPU time
Info::
https://policy.cookiereports.com/510df253_panel-en...: 57ms CPU time
Info::
Unattributable: 57ms CPU time
Warning::
Third-party scripts: 340ms (100% of total)

Main Thread Breakdown

Script Evaluation 34% Other 28% Style & Layout 25% Script Parsing & Compilation 6% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.astrazeneca.com/142ms1ms0ms3rd
https://www.astrazeneca.com/etc/designs/az/js/index.min.js84ms50ms19ms3rd
https://policy.cookiereports.com/510df253_panel-en-gb.js57ms43ms3ms3rd
Unattributable57ms1ms0ms3rd
A+
Font Loading
7 fonts (149 KB)
PASS
7 fonts (149 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

149 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.4 s LCP 2.0 shttps://use.typekit.net/af/2c24be/00000000000000007757659d/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n3&v=3l https://use.typekit.net/af/2c24be/00000000000000007757659d/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n3&v=3 — 22.3 KiB — 27 ms — font-display: swaphttps://www.astrazeneca.com/etc/designs/az/fonts/az-webfont.woff2?ef7886a1b2e9244781e1f65a5a306df3az-webfont.woff2 https://www.astrazeneca.com/etc/designs/az/fonts/az-webfont.woff2?ef7886a1b2e9244781e1f65a5a306df3 — 14.3 KiB — 42 ms — font-display: swaphttps://use.typekit.net/af/8c415e/0000000000000000775765a7/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=i4&v=3l https://use.typekit.net/af/8c415e/0000000000000000775765a7/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=i4&v=3 — 22.2 KiB — 31 ms — font-display: swaphttps://use.typekit.net/af/0f2024/00000000000000007757659e/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n4&v=3l https://use.typekit.net/af/0f2024/00000000000000007757659e/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n4&v=3 — 21.7 KiB — 29 ms — font-display: swaphttps://use.typekit.net/af/2d2994/0000000000000000775765a2/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=i7&v=3l https://use.typekit.net/af/2d2994/0000000000000000775765a2/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=i7&v=3 — 23.0 KiB — 5 ms — font-display: swaphttps://use.typekit.net/af/4a6cc0/0000000000000000775765a5/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=i3&v=3l https://use.typekit.net/af/4a6cc0/0000000000000000775765a5/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=i3&v=3 — 23.0 KiB — 6 ms — font-display: swaphttps://use.typekit.net/af/e7f69d/0000000000000000775765a4/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n2&v=3l https://use.typekit.net/af/e7f69d/0000000000000000775765a4/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n2&v=3 — 22.3 KiB — 9 ms — font-display: swap
l woff2 swap
Size 22 KB
Load time 27 ms
Start 523 ms
Risk FOUT — text flashes from fallback to web font
az-webfont.woff2 woff2 swap
Size 14 KB
Load time 42 ms
Start 523 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 22 KB
Load time 31 ms
Start 523 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 22 KB
Load time 29 ms
Start 524 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 23 KB
Load time 5 ms
Start 593 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 23 KB
Load time 6 ms
Start 593 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 22 KB
Load time 9 ms
Start 593 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
Network Waterfall
53 requests over 1101ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.4 s LCP 2.0 shttps://astrazeneca.com// https://astrazeneca.com/ — 301 — 430 B — 299 ms — h2https://www.astrazeneca.com/www.astrazeneca.com/ https://www.astrazeneca.com/ — 200 — 15.0 KiB — 64 ms — h2https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/rum-standalone.jsrum.hlx.page/.rum/@adobe/helix-rum-... https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/rum-standalone.js — 200 — 2.8 KiB — 40 ms — h2https://www.astrazeneca.com/etc/designs/az/css/base.min.csswww.astrazeneca.com/etc/designs/az/... https://www.astrazeneca.com/etc/designs/az/css/base.min.css — 200 — 95.5 KiB — 48 ms — h2https://www.astrazeneca.com/etc/designs/common/js/lib/modernizr.min.jswww.astrazeneca.com/etc/designs/com... https://www.astrazeneca.com/etc/designs/common/js/lib/modernizr.min.js — 200 — 9.8 KiB — 50 ms — h2https://policy.cookiereports.com/510df253_panel-en-gb.jspolicy.cookiereports.com/510df253_p... https://policy.cookiereports.com/510df253_panel-en-gb.js — 200 — 29.1 KiB — 111 ms — h2https://code.jquery.com/jquery-3.5.0.min.jscode.jquery.com/jquery-3.5.0.min.js https://code.jquery.com/jquery-3.5.0.min.js — 200 — 30.5 KiB — 46 ms — h2https://cdnjs.cloudflare.com/ajax/libs/jquery-migrate/3.2.0/jquery-migrate.min.jscdnjs.cloudflare.com/ajax/libs/jque... https://cdnjs.cloudflare.com/ajax/libs/jquery-migrate/3.2.0/jquery-migrate.min.js — 200 — 3.9 KiB — 54 ms — h3https://tags.tiqcdn.com/utag/astrazeneca/global-az-com/prod/utag.sync.jstags.tiqcdn.com/utag/astrazeneca/gl... https://tags.tiqcdn.com/utag/astrazeneca/global-az-com/prod/utag.sync.js — 200 — 549 B — 58 ms — h2https://www.astrazeneca.com/etc/designs/az/img/logo-az-condensed.pngwww.astrazeneca.com/etc/designs/az/... https://www.astrazeneca.com/etc/designs/az/img/logo-az-condensed.png — 200 — 1.2 KiB — 49 ms — h2https://www.astrazeneca.com/etc/designs/az/img/logo-az-condensed-white.pngwww.astrazeneca.com/etc/designs/az/... https://www.astrazeneca.com/etc/designs/az/img/logo-az-condensed-white.png — 200 — 1.3 KiB — 50 ms — h2https://use.typekit.net/ddz3ptv.cssuse.typekit.net/ddz3ptv.css https://use.typekit.net/ddz3ptv.css — 200 — 1.3 KiB — 18 ms — h2https://www.astrazeneca.com/etc/designs/az/img/logo-az.pngwww.astrazeneca.com/etc/designs/az/... https://www.astrazeneca.com/etc/designs/az/img/logo-az.png — 200 — 2.9 KiB — 21 ms — h2https://www.astrazeneca.com/etc/designs/az/img/logo-az-white.pngwww.astrazeneca.com/etc/designs/az/... https://www.astrazeneca.com/etc/designs/az/img/logo-az-white.png — 200 — 2.6 KiB — 21 ms — h2https://p.typekit.net/p.css?s=1&k=ddz3ptv&ht=tk&f=9805.9806.9807.9808.9810.9811.9812.9813.52983.52984.52985.52986&a=275900670&app=typekit&e=cssp.typekit.net/p.css?s=1&k=ddz3ptv&h... https://p.typekit.net/p.css?s=1&k=ddz3ptv&ht=tk&f=9805.9806.9807.9808.9810.9811.9812.9813.52983.52984.52985.52986&a=275900670&app=typekit&e=css — 200 — 172 B — 9 ms — h2https://www.astrazeneca.com/content/dam/az/homepage/AZ2986_BioPharmaceuticals_TA-Image_Female_Final_RGB-450x250.webpwww.astrazeneca.com/content/dam/az/... https://www.astrazeneca.com/content/dam/az/homepage/AZ2986_BioPharmaceuticals_TA-Image_Female_Final_RGB-450x250.webp — 200 — 29.7 KiB — 22 ms — h2https://www.astrazeneca.com/etc/designs/az/js/index.min.jswww.astrazeneca.com/etc/designs/az/... https://www.astrazeneca.com/etc/designs/az/js/index.min.js — 200 — 251.6 KiB — 64 ms — h2https://www.astrazeneca.com/etc/designs/common/js/lang/en_GB.min.jswww.astrazeneca.com/etc/designs/com... https://www.astrazeneca.com/etc/designs/common/js/lang/en_GB.min.js — 200 — 1.2 KiB — 49 ms — h2https://www.astrazeneca.com/content/dam/az/homepage/OI-helix-hero-450x250.webpwww.astrazeneca.com/content/dam/az/... https://www.astrazeneca.com/content/dam/az/homepage/OI-helix-hero-450x250.webp — 200 — 35.1 KiB — 58 ms — h2https://www.astrazeneca.com/content/dam/az/Investor_Relations/annual-report-2025/0-Header-image-900x500.webpwww.astrazeneca.com/content/dam/az/... https://www.astrazeneca.com/content/dam/az/Investor_Relations/annual-report-2025/0-Header-image-900x500.webp — 200 — 102.1 KiB — 52 ms — h2https://www.astrazeneca.com/content/dam/az/homepage/AZ2045-ipad-450x2501.webpwww.astrazeneca.com/content/dam/az/... https://www.astrazeneca.com/content/dam/az/homepage/AZ2045-ipad-450x2501.webp — 200 — 36.8 KiB — 59 ms — h2https://www.astrazeneca.com/content/dam/az/Sustainability/2025/Health-systems-04-banner-mobile.jpgwww.astrazeneca.com/content/dam/az/... https://www.astrazeneca.com/content/dam/az/Sustainability/2025/Health-systems-04-banner-mobile.jpg — 200 — 29.6 KiB — 52 ms — h2https://www.astrazeneca.com/content/dam/az/Sustainability/2025/sustainable-science-article-tile-2025.jpgwww.astrazeneca.com/content/dam/az/... https://www.astrazeneca.com/content/dam/az/Sustainability/2025/sustainable-science-article-tile-2025.jpg — 200 — 48.7 KiB — 55 ms — h2https://www.astrazeneca.com/content/dam/az/Sustainability/2025/Health-equity-09-banner-900-x-500.jpg/jcr:content/renditions/cq5dam.web.620.Health-equity-09-banner-900-x-500.jpgwww.astrazeneca.com/content/dam/az/... https://www.astrazeneca.com/content/dam/az/Sustainability/2025/Health-equity-09-banner-900-x-500.jpg/jcr:content/renditions/cq5dam.web.620.Health-equity-09-banner-900-x-500.jpg — 200 — 25.7 KiB — 56 ms — h2https://policy.cookiereports.com/j/jquery.min.jspolicy.cookiereports.com/j/jquery.m... https://policy.cookiereports.com/j/jquery.min.js — 200 — 30.3 KiB — 39 ms — h2https://www.astrazeneca.com/etc/designs/az/css/print.min.csswww.astrazeneca.com/etc/designs/az/... https://www.astrazeneca.com/etc/designs/az/css/print.min.css — 200 — 2.0 KiB — 56 ms — h2https://tags.tiqcdn.com/utag/astrazeneca/global-az-com/prod/utag.jstags.tiqcdn.com/utag/astrazeneca/gl... https://tags.tiqcdn.com/utag/astrazeneca/global-az-com/prod/utag.js — 200 — 35.2 KiB — 42 ms — h2https://use.typekit.net/af/2c24be/00000000000000007757659d/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n3&v=3use.typekit.net/af/2c24be/000000000... https://use.typekit.net/af/2c24be/00000000000000007757659d/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n3&v=3 — 200 — 22.3 KiB — 27 ms — h2https://www.astrazeneca.com/etc/designs/az/fonts/az-webfont.woff2?ef7886a1b2e9244781e1f65a5a306df3www.astrazeneca.com/etc/designs/az/... https://www.astrazeneca.com/etc/designs/az/fonts/az-webfont.woff2?ef7886a1b2e9244781e1f65a5a306df3 — 200 — 14.3 KiB — 42 ms — h2https://use.typekit.net/af/8c415e/0000000000000000775765a7/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=i4&v=3use.typekit.net/af/8c415e/000000000... https://use.typekit.net/af/8c415e/0000000000000000775765a7/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=i4&v=3 — 200 — 22.2 KiB — 31 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.4 s LCP 2.0 shttps://astrazeneca.com// https://astrazeneca.com/ — 301 — 430 B — 299 ms — h2https://www.astrazeneca.com/www.astrazeneca.com/ https://www.astrazeneca.com/ — 200 — 15.0 KiB — 64 ms — h2https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/rum-standalone.jsrum.hlx.page/.rum/@adobe/helix-rum-... https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/rum-standalone.js — 200 — 2.8 KiB — 40 ms — h2https://www.astrazeneca.com/etc/designs/az/css/base.min.csswww.astrazeneca.com/etc/designs/az/... https://www.astrazeneca.com/etc/designs/az/css/base.min.css — 200 — 95.5 KiB — 48 ms — h2https://www.astrazeneca.com/etc/designs/common/js/lib/modernizr.min.jswww.astrazeneca.com/etc/designs/com... https://www.astrazeneca.com/etc/designs/common/js/lib/modernizr.min.js — 200 — 9.8 KiB — 50 ms — h2https://policy.cookiereports.com/510df253_panel-en-gb.jspolicy.cookiereports.com/510df253_p... https://policy.cookiereports.com/510df253_panel-en-gb.js — 200 — 29.1 KiB — 111 ms — h2https://code.jquery.com/jquery-3.5.0.min.jscode.jquery.com/jquery-3.5.0.min.js https://code.jquery.com/jquery-3.5.0.min.js — 200 — 30.5 KiB — 46 ms — h2https://cdnjs.cloudflare.com/ajax/libs/jquery-migrate/3.2.0/jquery-migrate.min.jscdnjs.cloudflare.com/ajax/libs/jque... https://cdnjs.cloudflare.com/ajax/libs/jquery-migrate/3.2.0/jquery-migrate.min.js — 200 — 3.9 KiB — 54 ms — h3https://tags.tiqcdn.com/utag/astrazeneca/global-az-com/prod/utag.sync.jstags.tiqcdn.com/utag/astrazeneca/gl... https://tags.tiqcdn.com/utag/astrazeneca/global-az-com/prod/utag.sync.js — 200 — 549 B — 58 ms — h2https://www.astrazeneca.com/etc/designs/az/img/logo-az-condensed.pngwww.astrazeneca.com/etc/designs/az/... https://www.astrazeneca.com/etc/designs/az/img/logo-az-condensed.png — 200 — 1.2 KiB — 49 ms — h2https://www.astrazeneca.com/etc/designs/az/img/logo-az-condensed-white.pngwww.astrazeneca.com/etc/designs/az/... 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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 340ms · 296KB · $4/mo
www.astrazeneca.com
Other
Optional
Execution 142ms
Transfer 15 KB
Monthly Cost $2/mo
www.astrazeneca.com
Other
Optional
Execution 84ms
Transfer 252 KB
Unused 77%
Monthly Cost $1/mo
policy.cookiereports.com
Other
Optional
Execution 57ms
Transfer 29 KB
Monthly Cost $1/mo
Unattributable
Other
Optional
Execution 57ms
Transfer 0 KB
Monthly Cost $1/mo

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

77% of www.astrazeneca.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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