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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
3
REVIEW
1
PASS
8
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.
89
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.

1.63 s

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

2.41 s

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

2.40 s

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

0.001

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

2.21 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.

12.22 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
14
8 PASS 1 REVIEW 3 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (1.6 MiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4444ms total JS execution
FIX
4444ms total JS execution
Warning::
https://cdn-client.medium.com/lite/static/js/2746....: 1618ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 902ms CPU time
Warning::
https://cdn-client.medium.com/lite/static/js/main....: 659ms CPU time
Warning::
https://medium.com/cdn-cgi/challenge-platform/scri...: 341ms CPU time
Warning::
Unattributable: 311ms CPU time
Warning::
Third-party scripts: 4444ms (100% of total)

Main Thread Breakdown

Script Evaluation 77% Script Parsing & Compilation 9% Other 8%
ScriptTotalScriptingParse/CompileParty
https://cdn-client.medium.com/lite/static/js/2746.1817984d.js1618ms1427ms107ms3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js902ms765ms112ms3rd
https://cdn-client.medium.com/lite/static/js/main.bacd74be.js659ms506ms140ms3rd
https://medium.com/cdn-cgi/challenge-platform/scripts/jsd/main.js341ms290ms3ms3rd
Unattributable311ms11ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7JY7T788PK289ms235ms52ms3rd
https://medium.com/209ms49ms7ms3rd
https://cdn-client.medium.com/lite/static/js/HomeLoLegacyPage.MainContent.eb0cf9a0.chunk.js115ms113ms2ms3rd
F
JS Bundles
Action
13 scripts, 862 KB unused
FIX
13 scripts, 862 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 179 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 179 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 179 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn-client.medium.com/lite/static/js/main....: 147 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn-client.medium.com/lite/static/js/2746....: 115 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 862 KB
862 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB179 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js0 KB179 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB179 KB (49%)✓3rd
https://cdn-client.medium.com/lite/static/js/main.bacd74be.js246 KB147 KB (60%)✓3rd
https://cdn-client.medium.com/lite/static/js/2746.1817984d.js255 KB115 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-7JY7T788PK147 KB62 KB (42%)✓3rd
https://cdn-client.medium.com/lite/static/js/instrumentation.bbc70038.chunk.js2 KB—✓3rd
https://cdn-client.medium.com/lite/static/js/HomeLoLegacyPage.MainContent.eb0cf9a0.chunk.js5 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c12417176891760157 KB—✓3rd
https://www.google.com/recaptcha/enterprise.js?render=6Le-uGgpAAAAAPprRaokM8AKthQ9KNGdoxaGUvVp1 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

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
Page Weight Budget
Action
1.6 MB transferred, 36 requests
REVIEW
1.6 MB transferred, 36 requests
Info::
Page weighs 5.1 MB (1.6 MB transferred)
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Info::
36 HTTP requests
Info::
Estimated 0.33 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
36 requests
0.33 g CO2 per page load
JavaScript 1.4 MiB 87%
Fonts 60.4 KiB 4%
Images 51.0 KiB 3%
HTML 41.7 KiB 3%
CSS 41.7 KiB 3%
Other 7.1 KiB 0%
Other 2.3 KiB 0%
Other 1.1 KiB 0%
Other 793 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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+
Image Optimization
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Info::
All images are well-optimized
2 images 51 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (60 KB)
PASS
3 fonts (60 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

60 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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.6 s LCP 2.4 shttps://glyph.medium.com/font/b492c44/0-3j_4g_53_6bu_6c4_6c8_6c9_6cc_6cd_6ci_6cm/sohne-400-normal.woffsohne-400-normal.woff https://glyph.medium.com/font/b492c44/0-3j_4g_53_6bu_6c4_6c8_6c9_6cc_6cd_6ci_6cm/sohne-400-normal.woff — 13.0 KiB — 0 ms — font-display: swaphttps://glyph.medium.com/font/4a44748/0-3j_4g_53_6bu_6c4_6c8_6c9_6cc_6cd_6ci_6cm/gt-super-400-normal.woffgt-super-400-normal.woff https://glyph.medium.com/font/4a44748/0-3j_4g_53_6bu_6c4_6c8_6c9_6cc_6cd_6ci_6cm/gt-super-400-normal.woff — 13.5 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 0 ms — font-display: swap
sohne-400-normal.woff woff swap
Size 13 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
gt-super-400-normal.woff woff swap
Size 13 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 0 ms
Start 0 ms
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 ~8 KB and ~16 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

A
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=3600

DirectiveValueMeaning
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
36 requests over 0ms
INFO

Performance analysis not available for this result.

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 4444ms · 667KB · $59/mo
cdn-client.medium.com
Other
Costly
Execution 1618ms
Transfer 255 KB
Unused 45%
Monthly Cost $21/mo
www.gstatic.com
Other
Costly
Execution 902ms
Transfer 0 KB
Unused 49%
Monthly Cost $12/mo
cdn-client.medium.com
Other
Costly
Execution 659ms
Transfer 246 KB
Unused 60%
Monthly Cost $9/mo
medium.com
Other
Costly
Execution 341ms
Transfer 0 KB
Monthly Cost $5/mo
Unattributable
Other
Costly
Execution 311ms
Transfer 0 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 289ms
Transfer 147 KB
Unused 42%
Monthly Cost $4/mo
medium.com
Other
Costly
Execution 209ms
Transfer 14 KB
Monthly Cost $3/mo
cdn-client.medium.com
Other
Optional
Execution 115ms
Transfer 5 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • cdn-client.medium.com adds 1618ms and costs ~$21/month
  • www.gstatic.com adds 902ms and costs ~$12/month
  • cdn-client.medium.com adds 659ms and costs ~$9/month
  • medium.com adds 341ms and costs ~$5/month
  • Unattributable adds 311ms and costs ~$4/month
  • Google Tag Manager adds 289ms and costs ~$4/month
  • medium.com adds 209ms 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

cdn-client.medium.com takes 1618ms 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.gstatic.com takes 902ms 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

cdn-client.medium.com takes 659ms 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

60% of cdn-client.medium.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

medium.com takes 341ms 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 311ms 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 289ms 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

medium.com takes 209ms 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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