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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
93
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.

668 ms

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

1.59 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.

0.024

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

1.42 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.

1.60 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
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
11.9 MB transferred, 76 requests
FIX
11.9 MB transferred, 76 requests
Critical::
Page weighs 13.7 MB (11.9 MB transferred)
Warning::
Images are 2.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.3 MB
Info::
76 HTTP requests
Info::
Estimated 2.5 g CO2 per page load
11.9 MB / 2.4 MB budget
11.9 MB transferred
76 requests
2.5 g CO2 per page load
Other 9.1 MiB 76%
Images 2.3 MiB 19%
JavaScript 389.7 KiB 3%
Fonts 80.5 KiB 1%
CSS 42.5 KiB 0%
HTML 24.6 KiB 0%
Other 3.8 KiB 0%
Other 506 B 0%
Other 0 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

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 (11.9 MiB of 11.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
76 resources · 11.9 MB · 130 KB savings available
FIX
76 resources · 11.9 MB · 130 KB savings available
Warning::
Page weight 10.9 MB over 1MB target
Got: 11.9 MB Expected: ≤ 1 MB
Info::
~130 KB of savings available
Warning::
75 third-party resources (100% of weight)
Info::
7 resources over 200KB
76 resources · 11.9 MiB · 75 third-party 10.9 MiB over 1MB target
Media 76% · 9.1 MiB
Image 19% · 2.3 MiB
JavaScript 3% · 389.7 KiB
Font 1% · 80.5 KiB
CSS 0% · 42.5 KiB
Document 0% · 24.7 KiB
Other 0% · 20.9 KiB

~129.7 KiB of savings available

Remove unused JavaScript: 129.7 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
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
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::
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/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/uploads/sites/124... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
29 images 2.3 MB
0 oversized -0 KB
15 legacy format
14 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

Performance issues directly impact user engagement and conversion rates.

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

B
JS Execution Cost
570ms total JS execution
REVIEW
570ms total JS execution
Warning::
https://players.brightcove.net/1611106632001/defau...: 292ms CPU time
Info::
Unattributable: 117ms CPU time
Info::
https://www.merck.com/: 85ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-M74...: 77ms CPU time
Warning::
Third-party scripts: 570ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Other 34% Style & Layout 10% Script Parsing & Compilation 6% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
https://players.brightcove.net/1611106632001/default_default/index.min.js292ms166ms17ms3rd
Unattributable117ms1ms0ms3rd
https://www.merck.com/85ms5ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M74WZDM77ms62ms13ms3rd
B
JS Bundles
14 scripts, 130 KB unused
REVIEW
14 scripts, 130 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: 130 KB
130 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
4 fonts (81 KB)
PASS
4 fonts (81 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

81 KB total

Render-blocking

0

of 4

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 FCP 668 ms LCP 1.6 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 — 21 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 — 20 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 — 17 ms — font-display: swapdata:application/octet-stream;base64,d09GRk9UVE8AAA2kAAoAAAAADVwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABDRk…octet-stream;base64,d09... data:application/octet-stream;base64,d09GRk9UVE8AAA2kAAoAAAAADVwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABDRk… — 3.4 KiB — 11 ms — font-display: swap
InventionVF_W_Wght.woff2 woff2 swap
Size 35 KB
Load time 21 ms
Start 858 ms
Risk FOUT — text flashes from fallback to web font
InventionVF_Italics_W_W... woff2 swap
Size 38 KB
Load time 20 ms
Start 858 ms
Risk FOUT — text flashes from fallback to web font
font-woff;charset=utf-8... woff swap
Size 4 KB
Load time 17 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
octet-stream;base64,d09... unknown swap
Size 3 KB
Load time 11 ms
Start 1.0 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 ~2 KB and ~4 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
76 requests over 1803ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 668 ms LCP 1.6 shttps://merck.com// https://merck.com/ — 301 — 148 B — 184 ms — h2https://www.merck.com/www.merck.com/ https://www.merck.com/ — 200 — 24.6 KiB — 665 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 — 21 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 — 20 ms — h2https://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 — 19 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 — 9 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 — 10 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 — 11 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 — 161 ms — https://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 — 14 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 — 15 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 — 3 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 — 4 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 — 28 ms — h2https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/images/pause-white.svgwww.merck.com/wp-content/themes/cex... https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/images/pause-white.svg — 200 — 544 B — 7 ms — h2https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/images/play-white.svgwww.merck.com/wp-content/themes/cex... https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/images/play-white.svg — 200 — 435 B — 7 ms — h2https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/css/search-form.min.css?ver=1764577519www.merck.com/wp-content/themes/cex... https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/css/search-form.min.css?ver=1764577519 — 200 — 567 B — 8 ms — h2https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/blocks/mccberg/b25-homepage-light-text-over-dark-video/css/style.min.css?ver=1775805992www.merck.com/wp-content/themes/cex... https://www.merck.com/wp-content/themes/cex-wpvip-mhh-mhh2-mcc-theme/blocks/mccberg/b25-homepage-light-text-over-dark-video/css/style.min.css?ver=1775805992 — 200 — 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h2https://metrics.brightcove.com/v2/tracker?domain=videocloud&platform=video-js&session=e1ab258b1d5957c3c672130c&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=1776897302920&event=video_view&load_time_ms=348&start_time_ms=348&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=e1ab258b1d5957c3c672130c&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=1776897302920&event=video_view&load_time_ms=348&start_time_ms=348&video=6392644500112&video_name=HomepageTakeover_v3&video_duration=55 — 200 — 52 B — 122 ms — h3https://fastly-signed-us-east-1-prod.brightcovecdn.com/media/v1/hls/v4/clear/1611106632001/bc03b5f3-ab97-4863-bd4f-2352fb869668/587f1844-2a1e-4c5a-9dcd-a14ec98d65f6/3x/segment2.ts?fastly_token=NjllOWE1M2JfMTM5N2Y5M2FkY2UyMDg1ODlkMjExMGQzMTZiYTgzMDY2YjI1ZWM3ZjJiMGFmNjIwYzEyYTNkZjgxZWViMWMyZV8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzU4N2YxODQ0LTJhMWUtNGM1YS05ZGNkLWExNGVjOThkNjVmNi8%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-2352fb869668/587f1844-2a1e-4c5a-9dcd-a14ec98d65f6/3x/segment2.ts?fastly_token=NjllOWE1M2JfMTM5N2Y5M2FkY2UyMDg1ODlkMjExMGQzMTZiYTgzMDY2YjI1ZWM3ZjJiMGFmNjIwYzEyYTNkZjgxZWViMWMyZV8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzU4N2YxODQ0LTJhMWUtNGM1YS05ZGNkLWExNGVjOThkNjVmNi8%3D — 200 — 1.3 MiB — 32 ms — h2https://fastly-signed-us-east-1-prod.brightcovecdn.com/media/v1/hls/v4/clear/1611106632001/bc03b5f3-ab97-4863-bd4f-2352fb869668/587f1844-2a1e-4c5a-9dcd-a14ec98d65f6/3x/segment3.ts?fastly_token=NjllOWE1M2JfMTM5N2Y5M2FkY2UyMDg1ODlkMjExMGQzMTZiYTgzMDY2YjI1ZWM3ZjJiMGFmNjIwYzEyYTNkZjgxZWViMWMyZV8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzU4N2YxODQ0LTJhMWUtNGM1YS05ZGNkLWExNGVjOThkNjVmNi8%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-2352fb869668/587f1844-2a1e-4c5a-9dcd-a14ec98d65f6/3x/segment3.ts?fastly_token=NjllOWE1M2JfMTM5N2Y5M2FkY2UyMDg1ODlkMjExMGQzMTZiYTgzMDY2YjI1ZWM3ZjJiMGFmNjIwYzEyYTNkZjgxZWViMWMyZV8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzU4N2YxODQ0LTJhMWUtNGM1YS05ZGNkLWExNGVjOThkNjVmNi8%3D — 200 — 1.4 MiB — 33 ms — h2https://fastly-signed-us-east-1-prod.brightcovecdn.com/media/v1/hls/v4/clear/1611106632001/bc03b5f3-ab97-4863-bd4f-2352fb869668/587f1844-2a1e-4c5a-9dcd-a14ec98d65f6/3x/segment4.ts?fastly_token=NjllOWE1M2JfMTM5N2Y5M2FkY2UyMDg1ODlkMjExMGQzMTZiYTgzMDY2YjI1ZWM3ZjJiMGFmNjIwYzEyYTNkZjgxZWViMWMyZV8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzU4N2YxODQ0LTJhMWUtNGM1YS05ZGNkLWExNGVjOThkNjVmNi8%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-2352fb869668/587f1844-2a1e-4c5a-9dcd-a14ec98d65f6/3x/segment4.ts?fastly_token=NjllOWE1M2JfMTM5N2Y5M2FkY2UyMDg1ODlkMjExMGQzMTZiYTgzMDY2YjI1ZWM3ZjJiMGFmNjIwYzEyYTNkZjgxZWViMWMyZV8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzU4N2YxODQ0LTJhMWUtNGM1YS05ZGNkLWExNGVjOThkNjVmNi8%3D — 200 — 1.1 MiB — 26 ms — h2https://fastly-signed-us-east-1-prod.brightcovecdn.com/media/v1/hls/v4/clear/1611106632001/bc03b5f3-ab97-4863-bd4f-2352fb869668/587f1844-2a1e-4c5a-9dcd-a14ec98d65f6/3x/segment5.ts?fastly_token=NjllOWE1M2JfMTM5N2Y5M2FkY2UyMDg1ODlkMjExMGQzMTZiYTgzMDY2YjI1ZWM3ZjJiMGFmNjIwYzEyYTNkZjgxZWViMWMyZV8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzU4N2YxODQ0LTJhMWUtNGM1YS05ZGNkLWExNGVjOThkNjVmNi8%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-2352fb869668/587f1844-2a1e-4c5a-9dcd-a14ec98d65f6/3x/segment5.ts?fastly_token=NjllOWE1M2JfMTM5N2Y5M2FkY2UyMDg1ODlkMjExMGQzMTZiYTgzMDY2YjI1ZWM3ZjJiMGFmNjIwYzEyYTNkZjgxZWViMWMyZV8vL2Zhc3RseS1zaWduZWQtdXMtZWFzdC0xLXByb2QuYnJpZ2h0Y292ZWNkbi5jb20vbWVkaWEvdjEvaGxzL3Y0L2NsZWFyLzE2MTExMDY2MzIwMDEvYmMwM2I1ZjMtYWI5Ny00ODYzLWJkNGYtMjM1MmZiODY5NjY4LzU4N2YxODQ0LTJhMWUtNGM1YS05ZGNkLWExNGVjOThkNjVmNi8%3D — 200 — 1.4 MiB — 33 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 570ms · 381KB · $8/mo
players.brightcove.net
Other
Costly
Execution 292ms
Transfer 169 KB
Unused 32%
Monthly Cost $4/mo
Unattributable
Other
Optional
Execution 117ms
Transfer 0 KB
Monthly Cost $2/mo
www.merck.com
Other
Optional
Execution 85ms
Transfer 25 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 77ms
Transfer 187 KB
Unused 40%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • players.brightcove.net adds 292ms and costs ~$4/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 292ms 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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