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https://astrazeneca.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
3
REVIEW
5
PASS
7
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.
100
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.

5.61 s

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

9.15 s

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

188 ms

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

0.028

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

5.61 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.

9.34 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 5 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
51 resources · 1.5 MB · 220 KB savings available
FIX
51 resources · 1.5 MB · 220 KB savings available
Warning::
Page weight 461 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~220 KB of savings available
Warning::
50 third-party resources (100% of weight)
Info::
1 resources over 200KB
51 resources · 1.5 MiB · 50 third-party 461.4 KiB over 1MB target
Image 56% · 824.4 KiB
JavaScript 27% · 395.4 KiB
Font 10% · 148.9 KiB
CSS 7% · 98.9 KiB
Document 1% · 15.4 KiB
Other 0% · 2.4 KiB

~219.8 KiB of savings available

Remove unused JavaScript: 219.8 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.

B
Page Weight Budget
1.5 MB transferred, 51 requests
REVIEW
1.5 MB transferred, 51 requests
Info::
Page weighs 3.4 MB (1.5 MB transferred)
Info::
51 HTTP requests
Info::
Estimated 0.30 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
51 requests
0.30 g CO2 per page load
Images 816.2 KiB 55%
JavaScript 395.4 KiB 27%
Fonts 148.9 KiB 10%
CSS 98.9 KiB 7%
HTML 15.0 KiB 1%
Other 8.6 KiB 1%
Other 2.4 KiB 0%
0 2.4 MB 4.9 MB
Under budget
C
Image Optimization
Action
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Warning::
https://www.astrazeneca.com/content/dam/az/Sustain... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.astrazeneca.com/content/dam/az/homepag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.astrazeneca.com/content/dam/az/homepag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.astrazeneca.com/content/dam/az/Sustain... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.astrazeneca.com/content/dam/az/homepag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.astrazeneca.com/content/dam/az/Sustain... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.astrazeneca.com/content/dam/az/Investo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.astrazeneca.com/content/dam/az/Investo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
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.
23 images 816 KB
0 oversized -0 KB
13 legacy format
9 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

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 Execution Cost
Action
1577ms total JS execution
REVIEW
1577ms total JS execution
Warning::
https://www.astrazeneca.com/etc/designs/az/js/inde...: 499ms CPU time
Warning::
https://policy.cookiereports.com/510df253_panel-en...: 301ms CPU time
Info::
https://www.astrazeneca.com/: 234ms CPU time
Info::
Unattributable: 208ms CPU time
Info::
https://policy.cookiereports.com/j/jquery.min.js: 173ms CPU time
Warning::
Third-party scripts: 1577ms (100% of total)

Main Thread Breakdown

Script Evaluation 37% Other 26% Style & Layout 20% Script Parsing & Compilation 7% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
https://www.astrazeneca.com/etc/designs/az/js/index.min.js499ms174ms78ms3rd
https://policy.cookiereports.com/510df253_panel-en-gb.js301ms210ms12ms3rd
https://www.astrazeneca.com/234ms4ms2ms3rd
Unattributable208ms5ms0ms3rd
https://policy.cookiereports.com/j/jquery.min.js173ms97ms7ms3rd
https://code.jquery.com/jquery-3.5.0.min.js89ms77ms7ms3rd
https://www.astrazeneca.com/etc/designs/common/js/lib/modernizr.min.js73ms25ms3ms3rd
C
JS Bundles
Action
11 scripts, 220 KB unused
REVIEW
11 scripts, 220 KB unused
Warning::
https://www.astrazeneca.com/etc/designs/az/js/inde...: 195 KB unused (78%)
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: 220 KB
220 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.astrazeneca.com/etc/designs/az/js/index.min.js252 KB195 KB (78%)✓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+
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 5.6 s LCP 9.1 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 — 20 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 — 23 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 — 18 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 — 20 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 — 22 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 — 19 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 — 22.4 KiB — 16 ms — font-display: swap
l woff2 swap
Size 22 KB
Load time 20 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
az-webfont.woff2 woff2 swap
Size 14 KB
Load time 23 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 22 KB
Load time 18 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 23 KB
Load time 20 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 22 KB
Load time 22 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 23 KB
Load time 19 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 22 KB
Load time 16 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)
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
51 requests over 1649ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 5.6 s LCP 9.1 shttps://astrazeneca.com// https://astrazeneca.com/ — 301 — 431 B — 314 ms — h2https://www.astrazeneca.com/www.astrazeneca.com/ https://www.astrazeneca.com/ — 200 — 15.0 KiB — 397 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 — 72 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 — 46 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 — 49 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 — 141 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 — 10 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 — 53 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 — 546 B — 405 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 — 48 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 — 48 ms — h2https://use.typekit.net/ddz3ptv.cssuse.typekit.net/ddz3ptv.css https://use.typekit.net/ddz3ptv.css — 200 — 1.3 KiB — 60 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 — 20 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://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 — 46 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 — 25 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 — 53 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 — 21 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 — 23 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 — 23 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 — 21 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 — 21 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 — 20 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 — 27 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 — 20 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 — 304 ms — h2https://www.astrazeneca.com/content/dam/az/wscd/technologies/AZ3247-Heart-Failure-900x500.jpg/jcr:content/renditions/cq5dam.web.1200.AZ3247-Heart-Failure-900x500.jpgwww.astrazeneca.com/content/dam/az/... https://www.astrazeneca.com/content/dam/az/wscd/technologies/AZ3247-Heart-Failure-900x500.jpg/jcr:content/renditions/cq5dam.web.1200.AZ3247-Heart-Failure-900x500.jpg — 200 — 79.5 KiB — 23 ms — h2https://www.astrazeneca.com/content/dam/az/wscd/clinical-innovation/AZ3146--Female-Adult-11_900x500.jpg/jcr:content/renditions/cq5dam.web.480.AZ3146--Female-Adult-11_900x500.jpgwww.astrazeneca.com/content/dam/az/... https://www.astrazeneca.com/content/dam/az/wscd/clinical-innovation/AZ3146--Female-Adult-11_900x500.jpg/jcr:content/renditions/cq5dam.web.480.AZ3146--Female-Adult-11_900x500.jpg — 200 — 26.8 KiB — 24 ms — h2https://www.astrazeneca.com/content/dam/az/media-centre-docs/article_files/2025/AZ3051-AA-Patient-1-900x500.jpg/jcr:content/renditions/cq5dam.web.480.AZ3051-AA-Patient-1-900x500.jpgwww.astrazeneca.com/content/dam/az/... https://www.astrazeneca.com/content/dam/az/media-centre-docs/article_files/2025/AZ3051-AA-Patient-1-900x500.jpg/jcr:content/renditions/cq5dam.web.480.AZ3051-AA-Patient-1-900x500.jpg — 200 — 23.5 KiB — 25 ms — h2
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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 1577ms · 366KB · $21/mo
www.astrazeneca.com
Other
Costly
Execution 499ms
Transfer 252 KB
Unused 78%
Monthly Cost $7/mo
policy.cookiereports.com
Other
Costly
Execution 301ms
Transfer 29 KB
Monthly Cost $4/mo
www.astrazeneca.com
Other
Costly
Execution 234ms
Transfer 15 KB
Monthly Cost $3/mo
Unattributable
Other
Costly
Execution 208ms
Transfer 0 KB
Monthly Cost $3/mo
policy.cookiereports.com
Other
Optional
Execution 173ms
Transfer 30 KB
Monthly Cost $2/mo
code.jquery.com
Other
Optional
Execution 89ms
Transfer 31 KB
Monthly Cost $1/mo
www.astrazeneca.com
Other
Optional
Execution 73ms
Transfer 10 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.astrazeneca.com adds 499ms and costs ~$7/month
  • policy.cookiereports.com adds 301ms and costs ~$4/month
  • www.astrazeneca.com adds 234ms and costs ~$3/month
  • Unattributable adds 208ms 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

www.astrazeneca.com takes 499ms 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

78% 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

policy.cookiereports.com takes 301ms 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.astrazeneca.com takes 234ms 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 208ms 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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