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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
49
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
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.

4.45 s

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

14.23 s

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

517 ms

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

0.000

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

5.49 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.

15.86 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
8 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
2.8 MB transferred, 71 requests
FIX
2.8 MB transferred, 71 requests
Warning::
Page weighs 4.4 MB (2.8 MB transferred)
Warning::
Images are 1.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.8 MB
Warning::
JavaScript is 522 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 522 KB
Info::
Fonts are 314 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 314 KB
Info::
71 HTTP requests
Info::
Estimated 0.59 g CO2 per page load
2.8 MB / 2.4 MB budget
2.8 MB transferred
71 requests
0.59 g CO2 per page load
Images 1.8 MiB 63%
JavaScript 522.1 KiB 18%
Fonts 314.2 KiB 11%
HTML 189.0 KiB 7%
CSS 37.3 KiB 1%
Other 5.7 KiB 0%
Other 2.4 KiB 0%
Other 558 B 0%
Other 549 B 0%
0 2.4 MB 4.9 MB
Over budget

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

Why this matters

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

Source: web.dev

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

Why this matters

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

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (2.8 MiB of 2.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3373ms total JS execution
FIX
3373ms total JS execution
Warning::
https://www.mercola.com/: 488ms CPU time
Warning::
https://www.mercola.com/cdn-cgi/challenge-platform...: 466ms CPU time
Warning::
Unattributable: 456ms CPU time
Warning::
https://scripts.clarity.ms/0.8.59/clarity.js: 401ms CPU time
Warning::
https://cmp.osano.com/w3u6cvyELf/53173368-3d4e-414...: 387ms CPU time
Warning::
Third-party scripts: 3373ms (100% of total)

Main Thread Breakdown

Script Evaluation 59% Other 20% Style & Layout 7% Script Parsing & Compilation 4% Rendering 4% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.mercola.com/488ms57ms3ms3rd
https://www.mercola.com/cdn-cgi/challenge-platform/scripts/jsd/main.js466ms411ms7ms3rd
Unattributable456ms6ms0ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js401ms339ms7ms3rd
https://cmp.osano.com/w3u6cvyELf/53173368-3d4e-414e-8224-aaf0a9213b23/osano.js387ms325ms16ms3rd
https://www.mercola.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js267ms237ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-4MC0V1BXBK&cx=c&gtm=4e64k0245ms197ms37ms3rd
https://media.mercola.com/assets/js/comserver/mercolalibrary.js?v=20260422&_=1776889270463196ms101ms8ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T542QZJD176ms135ms28ms3rd
https://media.mercola.com/assets/js/comserver/mercolascript.js?v=20260422&_=1776889270464157ms113ms13ms3rd

Showing top 10 of 11 scripts

D
Page Weight Inventory
Action
71 resources · 2.8 MB · 158 KB savings available
FIX
71 resources · 2.8 MB · 158 KB savings available
Warning::
Page weight 1.8 MB over 1MB target
Got: 2.8 MB Expected: ≤ 1 MB
Info::
~158 KB of savings available
Warning::
70 third-party resources (100% of weight)
Info::
2 resources over 200KB
71 resources · 2.8 MiB · 70 third-party 1.8 MiB over 1MB target
Image 63% · 1.8 MiB
JavaScript 18% · 522.1 KiB
Font 11% · 314.2 KiB
Document 7% · 189.0 KiB
CSS 1% · 37.3 KiB
Other 0% · 4.2 KiB

~158.1 KiB of savings available

Remove unused JavaScript: 158.1 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
Image Optimization
Action
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Warning::
https://media.mercola.com/assets/images/mercola/fo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/assets/images/mercola/ic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/assets/images/mercola/th... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/assets/images/mercola/fi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/assets/images/mercola/us... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/assets/images/mercola/dc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/assets/images/mercola/nb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/assets/images/mercola/cn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/assets/images/mercola/us... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/assets/images/mercola/cb... 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://media.mercola.com/assets/images/mercola/dr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
33 images 1.8 MB
0 oversized -0 KB
10 legacy format
12 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

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

C
JS Bundles
Action
18 scripts, 158 KB unused
REVIEW
18 scripts, 158 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-4MC0...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T54...: 62 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://media.mercola.com/assets/js/comserver/merc...: 31 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 158 KB
158 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-4MC0V1BXBK&cx=c&gtm=4e64k0158 KB65 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T542QZJD127 KB62 KB (49%)✓3rd
https://media.mercola.com/assets/js/comserver/mercolascript.js?v=20260422&_=177688927046440 KB31 KB (88%)✓3rd
https://media.mercola.com/assets/js/comserver/mercolapagespeed.js?v=202604226 KB—✓3rd
blob:https://www.mercola.com/21361106-6a6f-475b-8691-e0293a9a826d-0 KB—✓3rd
https://www.mercola.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js4 KB—✓3rd
blob:https://www.mercola.com/51fdc064-afdc-40c1-ad67-a1b31f39f5fc-0 KB—✓3rd
https://media.mercola.com/assets/js/seosubscriptionbox.js?v=202604228 KB—✓3rd
https://cmp.osano.com/w3u6cvyELf/53173368-3d4e-414e-8224-aaf0a9213b23/osano.js44 KB—✓3rd
https://www.mercola.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?13 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

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
6 fonts (314 KB)
PASS
6 fonts (314 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

314 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 4.5 s LCP 14.2 shttps://media.mercola.com/assets/fonts/Inter/inter-v2-latin-500.woffinter-v2-latin-500.woff https://media.mercola.com/assets/fonts/Inter/inter-v2-latin-500.woff — 26.3 KiB — 144 ms — font-display: swaphttps://media.mercola.com/assets/fonts/Inter/inter-v2-latin-700.woffinter-v2-latin-700.woff https://media.mercola.com/assets/fonts/Inter/inter-v2-latin-700.woff — 26.5 KiB — 144 ms — font-display: swaphttps://media.mercola.com/assets/fonts/Inter/inter-v2-latin-800.woffinter-v2-latin-800.woff https://media.mercola.com/assets/fonts/Inter/inter-v2-latin-800.woff — 26.4 KiB — 110 ms — font-display: swaphttps://media.mercola.com/assets/fonts/font-awesome/version5/fa-brands-400.wofffa-brands-400.woff https://media.mercola.com/assets/fonts/font-awesome/version5/fa-brands-400.woff — 93.3 KiB — 145 ms — font-display: swaphttps://media.mercola.com/assets/fonts/font-awesome/version5/fa-solid-900.wofffa-solid-900.woff https://media.mercola.com/assets/fonts/font-awesome/version5/fa-solid-900.woff — 106.0 KiB — 155 ms — font-display: swaphttps://media.mercola.com/assets/fonts/alike-angular/alike-angular-v24-latin-regular.woffalike-angular-v24-latin... https://media.mercola.com/assets/fonts/alike-angular/alike-angular-v24-latin-regular.woff — 35.7 KiB — 31 ms — font-display: swap
inter-v2-latin-500.woff woff swap
Size 26 KB
Load time 144 ms
Start 500 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
inter-v2-latin-700.woff woff swap
Size 27 KB
Load time 144 ms
Start 500 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
inter-v2-latin-800.woff woff swap
Size 26 KB
Load time 110 ms
Start 501 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fa-brands-400.woff woff swap
Size 93 KB
Load time 145 ms
Start 501 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fa-solid-900.woff woff swap
Size 106 KB
Load time 155 ms
Start 501 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
alike-angular-v24-latin... woff swap
Size 36 KB
Load time 31 ms
Start 832 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 ~147 KB and ~294 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
1
preload
5
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
71 requests over 2793ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 4.5 s LCP 14.2 shttps://mercola.com// https://mercola.com/ — 301 — 352 B — 64 ms — h2https://www.mercola.com/www.mercola.com/ https://www.mercola.com/ — 200 — 187.8 KiB — 685 ms — h2https://cmp.osano.com/w3u6cvyELf/53173368-3d4e-414e-8224-aaf0a9213b23/osano.jscmp.osano.com/w3u6cvyELf/53173368-3... https://cmp.osano.com/w3u6cvyELf/53173368-3d4e-414e-8224-aaf0a9213b23/osano.js — 200 — 43.7 KiB — 187 ms — h3https://media.mercola.com/assets/js/osano/MercolaCustomJS.js?v=20260422media.mercola.com/assets/js/osano/M... https://media.mercola.com/assets/js/osano/MercolaCustomJS.js?v=20260422 — 200 — 9.9 KiB — 82 ms — h2https://media.mercola.com/assets/css/osano/MercolaCustomCSS.css?v=20260422media.mercola.com/assets/css/osano/... https://media.mercola.com/assets/css/osano/MercolaCustomCSS.css?v=20260422 — 200 — 5.2 KiB — 73 ms — h2https://media.mercola.com/assets/js/comserver/mercolajquery1.js?v=20260422media.mercola.com/assets/js/comserv... https://media.mercola.com/assets/js/comserver/mercolajquery1.js?v=20260422 — 200 — 41.9 KiB — 77 ms — h2https://media.mercola.com/assets/fonts/Inter/inter-v2-latin-500.woffmedia.mercola.com/assets/fonts/Inte... https://media.mercola.com/assets/fonts/Inter/inter-v2-latin-500.woff — 200 — 26.3 KiB — 144 ms — h2https://media.mercola.com/assets/fonts/Inter/inter-v2-latin-700.woffmedia.mercola.com/assets/fonts/Inte... https://media.mercola.com/assets/fonts/Inter/inter-v2-latin-700.woff — 200 — 26.5 KiB — 144 ms — h2https://media.mercola.com/assets/fonts/Inter/inter-v2-latin-800.woffmedia.mercola.com/assets/fonts/Inte... https://media.mercola.com/assets/fonts/Inter/inter-v2-latin-800.woff — 200 — 26.4 KiB — 110 ms — h2https://media.mercola.com/assets/fonts/font-awesome/version5/fa-brands-400.woffmedia.mercola.com/assets/fonts/font... https://media.mercola.com/assets/fonts/font-awesome/version5/fa-brands-400.woff — 200 — 93.3 KiB — 145 ms — h2https://media.mercola.com/assets/fonts/font-awesome/version5/fa-solid-900.woffmedia.mercola.com/assets/fonts/font... https://media.mercola.com/assets/fonts/font-awesome/version5/fa-solid-900.woff — 200 — 106.0 KiB — 155 ms — h2https://www.mercola.com/CMSPages/GetCSS.aspx?stylesheetname=wwwtfs2020www.mercola.com/CMSPages/GetCSS.asp... https://www.mercola.com/CMSPages/GetCSS.aspx?stylesheetname=wwwtfs2020 — 200 — 32.2 KiB — 160 ms — h2blob:https://www.mercola.com/51fdc064-afdc-40c1-ad67-a1b31f39f5fcwww.mercola.com/51fdc064-afdc-40c1-... blob:https://www.mercola.com/51fdc064-afdc-40c1-ad67-a1b31f39f5fc — 200 — -1 B — 16 ms — blobhttps://media.mercola.com/assets/js/mercoladatalayer/mercoladatalayer20210126.jsmedia.mercola.com/assets/js/mercola... https://media.mercola.com/assets/js/mercoladatalayer/mercoladatalayer20210126.js — 200 — 6.5 KiB — 25 ms — h2https://media.mercola.com/assets/images/mercola-logo-responsive.pngmedia.mercola.com/assets/images/mer... https://media.mercola.com/assets/images/mercola-logo-responsive.png — 200 — 9.1 KiB — 31 ms — h2https://media.mercola.com/assets/images/mercolamarket-m-logo_white.pngmedia.mercola.com/assets/images/mer... https://media.mercola.com/assets/images/mercolamarket-m-logo_white.png — 200 — 5.0 KiB — 29 ms — h2https://media.mercola.com/assets/images/mercola/ico-cart-mobile.svgmedia.mercola.com/assets/images/mer... https://media.mercola.com/assets/images/mercola/ico-cart-mobile.svg — 200 — 4.7 KiB — 36 ms — h2https://media.mercola.com/assets/images/mercola-m-logo.svg?width=40;height=40media.mercola.com/assets/images/mer... https://media.mercola.com/assets/images/mercola-m-logo.svg?width=40;height=40 — 200 — 5.0 KiB — 62 ms — h2https://media.mercola.com/assets/images/mercola/hero-header/drmercola-header-hero.webpmedia.mercola.com/assets/images/mer... https://media.mercola.com/assets/images/mercola/hero-header/drmercola-header-hero.webp — 200 — 16.6 KiB — 63 ms — h2https://media.mercola.com/assets/images/cads/butyrate-immune-system-hot-topic-desktop.webp?width=468&height=394media.mercola.com/assets/images/cad... https://media.mercola.com/assets/images/cads/butyrate-immune-system-hot-topic-desktop.webp?width=468&height=394 — 200 — 140.5 KiB — 69 ms — h2https://media.mercola.com/assets/images/cads/butyrate-immune-system-hot-topic-mobile.webp?width=773&height=434media.mercola.com/assets/images/cad... https://media.mercola.com/assets/images/cads/butyrate-immune-system-hot-topic-mobile.webp?width=773&height=434 — 200 — 241.7 KiB — 80 ms — h2https://media.mercola.com/assets/images/mercola/quotation-mark.pngmedia.mercola.com/assets/images/mer... https://media.mercola.com/assets/images/mercola/quotation-mark.png — 200 — 4.9 KiB — 69 ms — h2https://media.mercola.com/assets/images/mercola/dr-mercola-desktop.pngmedia.mercola.com/assets/images/mer... https://media.mercola.com/assets/images/mercola/dr-mercola-desktop.png — 200 — 176.2 KiB — 85 ms — 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h2https://j.clarity.ms/collectj.clarity.ms/collect https://j.clarity.ms/collect — 204 — 279 B — 117 ms — http/1.1https://j.clarity.ms/collectj.clarity.ms/collect https://j.clarity.ms/collect — -1 — 0 B — 0 ms —
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 3373ms · 665KB · €54/mo
www.mercola.com
Other
Costly
Execution 488ms
Transfer 188 KB
Monthly Cost €8/mo
www.mercola.com
Other
Costly
Execution 466ms
Transfer 0 KB
Monthly Cost €7/mo
Unattributable
Other
Costly
Execution 456ms
Transfer 0 KB
Monthly Cost €7/mo
Microsoft Clarity
Session Replay
Costly
Execution 401ms
Transfer 26 KB
Monthly Cost €6/mo
cmp.osano.com
Other
Costly
Execution 387ms
Transfer 44 KB
Monthly Cost €6/mo
www.mercola.com
Other
Costly
Execution 267ms
Transfer 4 KB
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 245ms
Transfer 158 KB
Unused 41%
Monthly Cost €4/mo
media.mercola.com
Other
Optional
Execution 196ms
Transfer 36 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 176ms
Transfer 127 KB
Unused 49%
Monthly Cost €3/mo
media.mercola.com
Other
Optional
Execution 157ms
Transfer 40 KB
Unused 88%
Monthly Cost €3/mo
media.mercola.com
Other
Optional
Execution 134ms
Transfer 42 KB
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • www.mercola.com adds 488ms and costs ~€8/month
  • www.mercola.com adds 466ms and costs ~€7/month
  • Unattributable adds 456ms and costs ~€7/month
  • Microsoft Clarity adds 401ms and costs ~€6/month
  • cmp.osano.com adds 387ms and costs ~€6/month
  • www.mercola.com adds 267ms and costs ~€4/month
  • Google Tag Manager adds 245ms 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

www.mercola.com takes 488ms 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.mercola.com takes 466ms 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 456ms 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

Microsoft Clarity takes 401ms 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

cmp.osano.com takes 387ms 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.mercola.com takes 267ms 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 245ms 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

88% of media.mercola.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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