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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
69
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.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

1.99 s

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

6.69 s

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

264 ms

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

0.035

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

3.33 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.

6.72 s

Page Load Progression

517 ms
1.0 s
1.6 s
2.1 s
2.6 s
3.1 s
3.6 s
4.1 s
Checks
17
7 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 81 requests
FIX
3.0 MB transferred, 81 requests
Warning::
Page weighs 4.8 MB (3.0 MB transferred)
Info::
81 HTTP requests
Info::
Estimated 0.62 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
81 requests
0.62 g CO2 per page load
Other 2.2 MiB 75%
JavaScript 389.7 KiB 13%
Images 206.8 KiB 7%
Fonts 77.1 KiB 3%
CSS 42.5 KiB 1%
HTML 24.6 KiB 1%
Other 3.8 KiB 0%
Other 506 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget
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 (3.0 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
81 resources · 3.0 MB · 129 KB savings available
FIX
81 resources · 3.0 MB · 129 KB savings available
Warning::
Page weight 2.0 MB over 1MB target
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~129 KB of savings available
Warning::
80 third-party resources (100% of weight)
Info::
6 resources over 200KB
81 resources · 3.0 MiB · 80 third-party 2.0 MiB over 1MB target
Media 75% · 2.2 MiB
JavaScript 13% · 389.7 KiB
Image 7% · 210.4 KiB
Font 3% · 77.1 KiB
CSS 1% · 42.5 KiB
Document 1% · 24.7 KiB
Other 1% · 20.9 KiB

~129.4 KiB of savings available

Remove unused JavaScript: 129.4 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
34 images, 0 KB saveable
REVIEW
34 images, 0 KB saveable
Warning::
https://www.merck.com/wp-content/uploads/sites/124... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/themes/cex-wpvip-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/uploads/sites/124... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/uploads/sites/124... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/uploads/sites/124... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/themes/cex-wpvip-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/uploads/sites/124... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/themes/cex-wpvip-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/uploads/sites/124... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/themes/cex-wpvip-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/uploads/sites/124... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/themes/cex-wpvip-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/themes/cex-wpvip-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/themes/cex-wpvip-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/uploads/sites/124... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/uploads/sites/124... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/uploads/sites/124... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/uploads/sites/124... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.merck.com/wp-content/themes/cex-wpvip-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
34 images 207 KB
0 oversized -0 KB
21 legacy format
19 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

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

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
1832ms total JS execution
REVIEW
1832ms total JS execution
Warning::
https://players.brightcove.net/1611106632001/defau...: 787ms CPU time
Warning::
Unattributable: 300ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-M74...: 262ms CPU time
Warning::
https://www.merck.com/wp-content/themes/cex-wpvip-...: 260ms CPU time
Info::
https://www.merck.com/: 224ms CPU time
Warning::
Third-party scripts: 1832ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Other 30% Style & Layout 11% Parse HTML & CSS 6% Script Parsing & Compilation 6% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://players.brightcove.net/1611106632001/default_default/index.min.js787ms491ms48ms3rd
Unattributable300ms5ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M74WZDM262ms200ms50ms3rd
https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/js/tinyslider.min.js?ver=1764577519260ms64ms2ms3rd
https://www.merck.com/224ms32ms7ms3rd
B
JS Bundles
14 scripts, 129 KB unused
REVIEW
14 scripts, 129 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-M74...: 75 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://players.brightcove.net/1611106632001/defau...: 55 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 129 KB
129 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-M74WZDM187 KB75 KB (40%)✓3rd
https://players.brightcove.net/1611106632001/default_default/index.min.js169 KB55 KB (32%)✓3rd
https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/js/search_suggestions.min.js?ver=17645775191 KB—✓3rd
https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/js/sticky-banner.min.js?ver=17645775191 KB—✓3rd
https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/js/plugins.min.js?ver=17645775190 KB—✓3rd
https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/js/scripts.min.js?ver=17768492586 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js?ver=6.8.50 KB—✓3rd
https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/blocks/mccberg/b25-homepage-light-text-over-dark-video/js/index.js?ver=17732347381 KB—✓3rd
https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/js/tinyslider.min.js?ver=176457751913 KB—✓3rd
https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/blocks/mccberg/b24-homepage-no-hero-block/js/index.js?ver=17645775191 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
3 fonts (77 KB)
PASS
3 fonts (77 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

77 KB total

Render-blocking

0

of 3

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 2.0 s LCP 6.7 shttps://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/fonts/InventionVF_W_Wght.woff2InventionVF_W_Wght.woff2 https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/fonts/InventionVF_W_Wght.woff2 — 35.0 KiB — 15 ms — font-display: swaphttps://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/fonts/InventionVF_Italics_W_Wght.woff2InventionVF_Italics_W_W... https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/fonts/InventionVF_Italics_W_Wght.woff2 — 38.5 KiB — 16 ms — font-display: swapdata:application/font-woff;charset=utf-8;base64,d09GRgABAAAAAA54AAoAAAAAFmgAAQAAAAAAAAAAAAAAAAAAAAA…font-woff;charset=utf-8... data:application/font-woff;charset=utf-8;base64,d09GRgABAAAAAA54AAoAAAAAFmgAAQAAAAAAAAAAAAAAAAAAAAA… — 3.6 KiB — 11 ms — font-display: swap
InventionVF_W_Wght.woff2 woff2 swap
Size 35 KB
Load time 15 ms
Start 719 ms
Risk FOUT — text flashes from fallback to web font
InventionVF_Italics_W_W... woff2 swap
Size 38 KB
Load time 16 ms
Start 719 ms
Risk FOUT — text flashes from fallback to web font
font-woff;charset=utf-8... woff swap
Size 4 KB
Load time 11 ms
Start 967 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 ~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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
—
preload
6
dns-prefetch
1
prefetch
—

7 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
Network Waterfall
81 requests over 1874ms
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 2.0 s LCP 6.7 shttps://merck.com// https://merck.com/ — 301 — 148 B — 194 ms — h2https://www.merck.com/www.merck.com/ https://www.merck.com/ — 200 — 24.6 KiB — 514 ms — h2https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/fonts/InventionVF_W_Wght.woff2www.merck.com/wp-content/themes/cex... https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/fonts/InventionVF_W_Wght.woff2 — 200 — 35.0 KiB — 15 ms — h2https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/fonts/InventionVF_Italics_W_Wght.woff2www.merck.com/wp-content/themes/cex... https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/fonts/InventionVF_Italics_W_Wght.woff2 — 200 — 38.5 KiB — 16 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.js?ver=6.8.5cdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js?ver=6.8.5 — -1 — 0 B — 108 ms — https://www.merck.com/wp-includes/css/dist/block-library/style.min.css?ver=6.8.5www.merck.com/wp-includes/css/dist/... https://www.merck.com/wp-includes/css/dist/block-library/style.min.css?ver=6.8.5 — 200 — 15.5 KiB — 14 ms — h2https://www.merck.com/wp-content/mu-plugins/qm-plugins/qm-object-cache/css/style.css?ver=0.2www.merck.com/wp-content/mu-plugins... https://www.merck.com/wp-content/mu-plugins/qm-plugins/qm-object-cache/css/style.css?ver=0.2 — 200 — 823 B — 8 ms — h2https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/css/default-font.min.css?ver=1764577519www.merck.com/wp-content/themes/cex... https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/css/default-font.min.css?ver=1764577519 — 200 — 573 B — 9 ms — h2https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/css/style.min.css?ver=1776849258www.merck.com/wp-content/themes/cex... https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/css/style.min.css?ver=1776849258 — 200 — 9.6 KiB — 10 ms — h2https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/css/footer-flagship-standard.min.css?ver=1764577519www.merck.com/wp-content/themes/cex... https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/css/footer-flagship-standard.min.css?ver=1764577519 — 200 — 1.6 KiB — 10 ms — h2https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/css/masthead-country-1.min.css?ver=1773234738www.merck.com/wp-content/themes/cex... https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/css/masthead-country-1.min.css?ver=1773234738 — 200 — 3.9 KiB — 12 ms — h2https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/css/bottom-banner.min.css?ver=1764577519www.merck.com/wp-content/themes/cex... https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/css/bottom-banner.min.css?ver=1764577519 — 200 — 674 B — 16 ms — h2https://www.merck.com/wp-content/uploads/sites/124/2025/08/site-logo.svgwww.merck.com/wp-content/uploads/si... https://www.merck.com/wp-content/uploads/sites/124/2025/08/site-logo.svg — 200 — 1.4 KiB — 5 ms — h2https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/images/search-white.svgwww.merck.com/wp-content/themes/cex... https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/images/search-white.svg — 200 — 548 B — 6 ms — h2https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/images/burger-white.svgwww.merck.com/wp-content/themes/cex... https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/images/burger-white.svg — 200 — 457 B — 3 ms — h2https://players.brightcove.net/1611106632001/default_default/index.min.jsplayers.brightcove.net/161110663200... https://players.brightcove.net/1611106632001/default_default/index.min.js — 200 — 169.5 KiB — 153 ms — 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h2https://fastly-signed-us-east-1-prod.brightcovecdn.com/media/v1/hls/v4/clear/1611106632001/bc03b5f3-ab97-4863-bd4f-2352fb869668/1fb1d75d-a6b0-4bb8-9e71-a8ebd2010347/3x/segment1.ts?fastly_token=NjllOWE1MmNfOGIxZGZkN2U1NjM5ZWQyMjM1ZmM5ZDlmOTJjZmE2ZmVkMTA0MDQzNTAxZjA5NTgxNjgyZmQyNDJjZmMzNzczYl8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzFmYjFkNzVkLWE2YjAtNGJiOC05ZTcxLWE4ZWJkMjAxMDM0Ny8%3Dfastly-signed-us-east-1-prod.bright... https://fastly-signed-us-east-1-prod.brightcovecdn.com/media/v1/hls/v4/clear/1611106632001/bc03b5f3-ab97-4863-bd4f-2352fb869668/1fb1d75d-a6b0-4bb8-9e71-a8ebd2010347/3x/segment1.ts?fastly_token=NjllOWE1MmNfOGIxZGZkN2U1NjM5ZWQyMjM1ZmM5ZDlmOTJjZmE2ZmVkMTA0MDQzNTAxZjA5NTgxNjgyZmQyNDJjZmMzNzczYl8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzFmYjFkNzVkLWE2YjAtNGJiOC05ZTcxLWE4ZWJkMjAxMDM0Ny8%3D — 200 — 503.6 KiB — 14 ms — h2https://metrics.brightcove.com/v2/tracker?domain=videocloud&platform=video-js&session=8f1f413d711ea7188f4b0258&account=1611106632001&destination=https%3A%2F%2Fwww.merck.com%2F&platform_version=5.28.1&player=players.brightcove.com%2F1611106632001%2Fdefault_default&player_name=Brightcove%20Default%20Player&source=&time=1776897288023&event=video_view&load_time_ms=472&start_time_ms=472&video=6392644500112&video_name=HomepageTakeover_v3&video_duration=55metrics.brightcove.com/v2/tracker?d... https://metrics.brightcove.com/v2/tracker?domain=videocloud&platform=video-js&session=8f1f413d711ea7188f4b0258&account=1611106632001&destination=https%3A%2F%2Fwww.merck.com%2F&platform_version=5.28.1&player=players.brightcove.com%2F1611106632001%2Fdefault_default&player_name=Brightcove%20Default%20Player&source=&time=1776897288023&event=video_view&load_time_ms=472&start_time_ms=472&video=6392644500112&video_name=HomepageTakeover_v3&video_duration=55 — 200 — 52 B — 124 ms — h3https://fastly-signed-us-east-1-prod.brightcovecdn.com/media/v1/hls/v4/clear/1611106632001/bc03b5f3-ab97-4863-bd4f-2352fb869668/1fb1d75d-a6b0-4bb8-9e71-a8ebd2010347/3x/segment2.ts?fastly_token=NjllOWE1MmNfOGIxZGZkN2U1NjM5ZWQyMjM1ZmM5ZDlmOTJjZmE2ZmVkMTA0MDQzNTAxZjA5NTgxNjgyZmQyNDJjZmMzNzczYl8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzFmYjFkNzVkLWE2YjAtNGJiOC05ZTcxLWE4ZWJkMjAxMDM0Ny8%3Dfastly-signed-us-east-1-prod.bright... https://fastly-signed-us-east-1-prod.brightcovecdn.com/media/v1/hls/v4/clear/1611106632001/bc03b5f3-ab97-4863-bd4f-2352fb869668/1fb1d75d-a6b0-4bb8-9e71-a8ebd2010347/3x/segment2.ts?fastly_token=NjllOWE1MmNfOGIxZGZkN2U1NjM5ZWQyMjM1ZmM5ZDlmOTJjZmE2ZmVkMTA0MDQzNTAxZjA5NTgxNjgyZmQyNDJjZmMzNzczYl8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzFmYjFkNzVkLWE2YjAtNGJiOC05ZTcxLWE4ZWJkMjAxMDM0Ny8%3D — 200 — 356.3 KiB — 9 ms — h2https://fastly-signed-us-east-1-prod.brightcovecdn.com/media/v1/hls/v4/clear/1611106632001/bc03b5f3-ab97-4863-bd4f-2352fb869668/1fb1d75d-a6b0-4bb8-9e71-a8ebd2010347/3x/segment3.ts?fastly_token=NjllOWE1MmNfOGIxZGZkN2U1NjM5ZWQyMjM1ZmM5ZDlmOTJjZmE2ZmVkMTA0MDQzNTAxZjA5NTgxNjgyZmQyNDJjZmMzNzczYl8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzFmYjFkNzVkLWE2YjAtNGJiOC05ZTcxLWE4ZWJkMjAxMDM0Ny8%3Dfastly-signed-us-east-1-prod.bright... https://fastly-signed-us-east-1-prod.brightcovecdn.com/media/v1/hls/v4/clear/1611106632001/bc03b5f3-ab97-4863-bd4f-2352fb869668/1fb1d75d-a6b0-4bb8-9e71-a8ebd2010347/3x/segment3.ts?fastly_token=NjllOWE1MmNfOGIxZGZkN2U1NjM5ZWQyMjM1ZmM5ZDlmOTJjZmE2ZmVkMTA0MDQzNTAxZjA5NTgxNjgyZmQyNDJjZmMzNzczYl8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzFmYjFkNzVkLWE2YjAtNGJiOC05ZTcxLWE4ZWJkMjAxMDM0Ny8%3D — 200 — 350.7 KiB — 10 ms — h2https://fastly-signed-us-east-1-prod.brightcovecdn.com/media/v1/hls/v4/clear/1611106632001/bc03b5f3-ab97-4863-bd4f-2352fb869668/1fb1d75d-a6b0-4bb8-9e71-a8ebd2010347/3x/segment4.ts?fastly_token=NjllOWE1MmNfOGIxZGZkN2U1NjM5ZWQyMjM1ZmM5ZDlmOTJjZmE2ZmVkMTA0MDQzNTAxZjA5NTgxNjgyZmQyNDJjZmMzNzczYl8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzFmYjFkNzVkLWE2YjAtNGJiOC05ZTcxLWE4ZWJkMjAxMDM0Ny8%3Dfastly-signed-us-east-1-prod.bright... https://fastly-signed-us-east-1-prod.brightcovecdn.com/media/v1/hls/v4/clear/1611106632001/bc03b5f3-ab97-4863-bd4f-2352fb869668/1fb1d75d-a6b0-4bb8-9e71-a8ebd2010347/3x/segment4.ts?fastly_token=NjllOWE1MmNfOGIxZGZkN2U1NjM5ZWQyMjM1ZmM5ZDlmOTJjZmE2ZmVkMTA0MDQzNTAxZjA5NTgxNjgyZmQyNDJjZmMzNzczYl8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzFmYjFkNzVkLWE2YjAtNGJiOC05ZTcxLWE4ZWJkMjAxMDM0Ny8%3D — 200 — 241.7 KiB — 7 ms — h2https://fastly-signed-us-east-1-prod.brightcovecdn.com/media/v1/hls/v4/clear/1611106632001/bc03b5f3-ab97-4863-bd4f-2352fb869668/1fb1d75d-a6b0-4bb8-9e71-a8ebd2010347/3x/segment5.ts?fastly_token=NjllOWE1MmNfOGIxZGZkN2U1NjM5ZWQyMjM1ZmM5ZDlmOTJjZmE2ZmVkMTA0MDQzNTAxZjA5NTgxNjgyZmQyNDJjZmMzNzczYl8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzFmYjFkNzVkLWE2YjAtNGJiOC05ZTcxLWE4ZWJkMjAxMDM0Ny8%3Dfastly-signed-us-east-1-prod.bright... https://fastly-signed-us-east-1-prod.brightcovecdn.com/media/v1/hls/v4/clear/1611106632001/bc03b5f3-ab97-4863-bd4f-2352fb869668/1fb1d75d-a6b0-4bb8-9e71-a8ebd2010347/3x/segment5.ts?fastly_token=NjllOWE1MmNfOGIxZGZkN2U1NjM5ZWQyMjM1ZmM5ZDlmOTJjZmE2ZmVkMTA0MDQzNTAxZjA5NTgxNjgyZmQyNDJjZmMzNzczYl8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzFmYjFkNzVkLWE2YjAtNGJiOC05ZTcxLWE4ZWJkMjAxMDM0Ny8%3D — 200 — 309.2 KiB — 9 ms — h2
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 1832ms · 394KB · $24/mo
players.brightcove.net
Other
Costly
Execution 787ms
Transfer 169 KB
Unused 32%
Monthly Cost $10/mo
Unattributable
Other
Costly
Execution 300ms
Transfer 0 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 262ms
Transfer 187 KB
Unused 40%
Monthly Cost $3/mo
www.merck.com
Other
Costly
Execution 260ms
Transfer 13 KB
Monthly Cost $3/mo
www.merck.com
Other
Costly
Execution 224ms
Transfer 25 KB
Monthly Cost $3/mo

These scripts may cost more than they're worth

  • players.brightcove.net adds 787ms and costs ~$10/month
  • Unattributable adds 300ms and costs ~$4/month
  • Google Tag Manager adds 262ms and costs ~$3/month
  • www.merck.com adds 260ms and costs ~$3/month
  • www.merck.com adds 224ms 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

players.brightcove.net takes 787ms 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 300ms 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 262ms 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.merck.com takes 260ms 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.merck.com takes 224ms 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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