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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
68
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
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.

1.10 s

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

2.95 s

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

4 ms

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

0.258

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

1.33 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.

3.15 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 74 requests
FIX
2.9 MB transferred, 74 requests
Warning::
Page weighs 4.4 MB (2.9 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 520 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 520 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::
74 HTTP requests
Info::
Estimated 0.61 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
74 requests
0.61 g CO2 per page load
Images 1.8 MiB 64%
JavaScript 520.5 KiB 18%
Fonts 314.2 KiB 11%
HTML 189.1 KiB 6%
CSS 37.4 KiB 1%
Other 5.7 KiB 0%
Other 2.8 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 (2.9 MiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
74 resources · 2.9 MB · 158 KB savings available
FIX
74 resources · 2.9 MB · 158 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~158 KB of savings available
Warning::
73 third-party resources (100% of weight)
Info::
2 resources over 200KB
74 resources · 2.9 MiB · 73 third-party 1.9 MiB over 1MB target
Image 64% · 1.8 MiB
JavaScript 18% · 520.5 KiB
Font 11% · 314.2 KiB
Document 6% · 189.1 KiB
CSS 1% · 37.4 KiB
Other 0% · 4.6 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
36 images, 0 KB saveable
REVIEW
36 images, 0 KB saveable
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.
Warning::
https://media.mercola.com/ImageServer/Public/2026/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/ImageServer/Public/2026/... 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/fi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/ImageServer/Public/2026/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/ImageServer/Public/2026/... 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/ImageServer/Public/2026/... 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::
https://media.mercola.com/ImageServer/Public/2026/... 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.
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-lo... 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/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/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/dc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/ImageServer/Public/2026/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/ImageServer/Public/2026/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/assets/images/cads/butyr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.mercola.com/assets/images/mercolamar... 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/ImageServer/Public/2026/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
36 images 1.8 MB
0 oversized -0 KB
13 legacy format
24 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

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

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

B
JS Execution Cost
665ms total JS execution
REVIEW
665ms total JS execution
Info::
https://cmp.osano.com/w3u6cvyELf/53173368-3d4e-414...: 127ms CPU time
Info::
Unattributable: 115ms CPU time
Info::
https://www.mercola.com/: 104ms CPU time
Info::
https://scripts.clarity.ms/0.8.59/clarity.js: 97ms CPU time
Info::
https://www.mercola.com/cdn-cgi/challenge-platform...: 88ms CPU time
Warning::
Third-party scripts: 665ms (100% of total)

Main Thread Breakdown

Script Evaluation 60% Other 20% Style & Layout 8% Script Parsing & Compilation 4% Parse HTML & CSS 3% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://cmp.osano.com/w3u6cvyELf/53173368-3d4e-414e-8224-aaf0a9213b23/osano.js127ms105ms4ms3rd
Unattributable115ms1ms0ms3rd
https://www.mercola.com/104ms11ms1ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js97ms80ms1ms3rd
https://www.mercola.com/cdn-cgi/challenge-platform/scripts/jsd/main.js88ms83ms1ms3rd
https://www.mercola.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js78ms69ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-4MC0V1BXBK&cx=c&gtm=4e64k056ms47ms8ms3rd
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&_=177688928573240 KB31 KB (88%)✓3rd
https://media.mercola.com/assets/js/mercoladatalayer/mercoladatalayer20210126.js7 KB—✓3rd
blob:https://www.mercola.com/25ad84a9-f886-4972-badc-a4fe38dba5d3-0 KB—✓3rd
https://www.mercola.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js4 KB—✓3rd
blob:https://www.mercola.com/576bf739-9901-407a-85b1-6ec3ff133e02-0 KB—✓3rd
https://media.mercola.com/assets/js/seosubscriptionbox.js?v=202604228 KB—✓3rd
https://media.mercola.com/assets/js/comserver/mercolapagespeed.js?v=202604226 KB—✓3rd
https://www.mercola.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?12 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 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 3.0 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 — 115 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 — 115 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 — 26.7 KiB — 74 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 — 93.0 KiB — 112 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 — 112 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 — 30 ms — font-display: swap
inter-v2-latin-500.woff woff swap
Size 26 KB
Load time 115 ms
Start 280 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 115 ms
Start 280 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 27 KB
Load time 74 ms
Start 280 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 112 ms
Start 280 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 112 ms
Start 281 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 30 ms
Start 540 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
74 requests over 2483ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 3.0 shttps://mercola.com// https://mercola.com/ — 301 — 356 B — 59 ms — h2https://www.mercola.com/www.mercola.com/ https://www.mercola.com/ — 200 — 187.9 KiB — 419 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 — 28 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 — 39 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 — 33 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 — 37 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 — 115 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 — 115 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 — 26.7 KiB — 74 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 — 93.0 KiB — 112 ms — 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h2blob:https://www.mercola.com/53109cc3-4eaa-4da1-a766-17b463f9c764www.mercola.com/53109cc3-4eaa-4da1-... blob:https://www.mercola.com/53109cc3-4eaa-4da1-a766-17b463f9c764 — 200 — -1 B — 8 ms — blobhttps://media.mercola.com/assets/js/comserver/mercolascript.js?v=20260422&_=1776889285732media.mercola.com/assets/js/comserv... https://media.mercola.com/assets/js/comserver/mercolascript.js?v=20260422&_=1776889285732 — 200 — 40.0 KiB — 138 ms — h2https://media.mercola.com/assets/images/cads/earth-day-sitewide-042126-cs-desktop.jpgmedia.mercola.com/assets/images/cad... https://media.mercola.com/assets/images/cads/earth-day-sitewide-042126-cs-desktop.jpg — 200 — 50.3 KiB — 37 ms — h2https://media.mercola.com/ImageServer/Public/2026/April/lead/vitamin-a-thyroid-hormone-good-eyesight-thumb.jpgmedia.mercola.com/ImageServer/Publi... https://media.mercola.com/ImageServer/Public/2026/April/lead/vitamin-a-thyroid-hormone-good-eyesight-thumb.jpg — 200 — 38.7 KiB — 29 ms — h2https://media.mercola.com/ImageServer/Public/2026/April/lead/early-warning-signs-pancreatic-problems-thmbnl.jpgmedia.mercola.com/ImageServer/Publi... https://media.mercola.com/ImageServer/Public/2026/April/lead/early-warning-signs-pancreatic-problems-thmbnl.jpg — 200 — 24.4 KiB — 35 ms — h2https://media.mercola.com/ImageServer/Public/2026/April/lead/frequent-urination-underlying-health-conditions.jpgmedia.mercola.com/ImageServer/Publi... https://media.mercola.com/ImageServer/Public/2026/April/lead/frequent-urination-underlying-health-conditions.jpg — 200 — 42.0 KiB — 31 ms — h2https://media.mercola.com/ImageServer/Public/2026/April/lead/melatonin-sleep-deprivation-immune-dysregulation-thumb.jpgmedia.mercola.com/ImageServer/Publi... https://media.mercola.com/ImageServer/Public/2026/April/lead/melatonin-sleep-deprivation-immune-dysregulation-thumb.jpg — 200 — 25.7 KiB — 28 ms — h2https://media.mercola.com/ImageServer/Public/2026/April/lead/hidden-fat-visceral-liver-bmi-thmbnl.jpgmedia.mercola.com/ImageServer/Publi... https://media.mercola.com/ImageServer/Public/2026/April/lead/hidden-fat-visceral-liver-bmi-thmbnl.jpg — 200 — 32.9 KiB — 34 ms — h2https://media.mercola.com/ImageServer/Public/2026/April/lead/anger-management-techniques.jpgmedia.mercola.com/ImageServer/Publi... https://media.mercola.com/ImageServer/Public/2026/April/lead/anger-management-techniques.jpg — 200 — 43.0 KiB — 33 ms — h2https://scripts.clarity.ms/0.8.59/clarity.jsscripts.clarity.ms/0.8.59/clarity.j... https://scripts.clarity.ms/0.8.59/clarity.js — 200 — 26.2 KiB — 134 ms — h2https://media.mercola.com/ImageServer/Public/2026/April/Nonlead/ghost-poops-saag.jpgmedia.mercola.com/ImageServer/Publi... https://media.mercola.com/ImageServer/Public/2026/April/Nonlead/ghost-poops-saag.jpg — 200 — 14.8 KiB — 29 ms — h2https://media.mercola.com/ImageServer/Public/2026/April/Nonlead/oranges-could-help-reduce-obesity.jpgmedia.mercola.com/ImageServer/Publi... https://media.mercola.com/ImageServer/Public/2026/April/Nonlead/oranges-could-help-reduce-obesity.jpg — 200 — 18.9 KiB — 25 ms — h2https://media.mercola.com/ImageServer/Public/2026/April/Nonlead/breaking-news-2-blog-thumb.jpgmedia.mercola.com/ImageServer/Publi... https://media.mercola.com/ImageServer/Public/2026/April/Nonlead/breaking-news-2-blog-thumb.jpg — 200 — 15.8 KiB — 27 ms — h2https://media.mercola.com/themes/mercola/images/search-select-arrow.pngmedia.mercola.com/themes/mercola/im... https://media.mercola.com/themes/mercola/images/search-select-arrow.png — 200 — 4.3 KiB — 27 ms — h2https://media.mercola.com/assets/images/searchloadingicon.gifmedia.mercola.com/assets/images/sea... https://media.mercola.com/assets/images/searchloadingicon.gif — 200 — 7.1 KiB — 27 ms — h2https://j.clarity.ms/collectj.clarity.ms/collect https://j.clarity.ms/collect — 204 — 279 B — 644 ms — http/1.1https://j.clarity.ms/collectj.clarity.ms/collect https://j.clarity.ms/collect — 204 — 279 B — 119 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 665ms · 420KB · €11/mo
cmp.osano.com
Other
Optional
Execution 127ms
Transfer 44 KB
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 115ms
Transfer 0 KB
Monthly Cost €2/mo
www.mercola.com
Other
Optional
Execution 104ms
Transfer 188 KB
Monthly Cost €2/mo
Microsoft Clarity
Session Replay
Optional
Execution 97ms
Transfer 26 KB
Monthly Cost €2/mo
www.mercola.com
Other
Optional
Execution 88ms
Transfer 0 KB
Monthly Cost €1/mo
www.mercola.com
Other
Optional
Execution 78ms
Transfer 4 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 56ms
Transfer 158 KB
Unused 41%
Monthly Cost €1/mo

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

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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