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Performance

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

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

Mobile Desktop
92
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.
77
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.

513 ms

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

1.38 s

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

170 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.

882 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.07 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 2 REVIEW 2 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 (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
14 scripts, 931 KB unused
FIX
14 scripts, 931 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....: 146 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: 931 KB
931 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 KB146 KB (60%)✓3rd
https://cdn-client.medium.com/lite/static/js/2746.1817984d.js255 KB115 KB (45%)✓3rd
https://accounts.google.com/gsi/client93 KB70 KB (75%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-7JY7T788PK147 KB61 KB (42%)✓3rd
https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c12417176891760157 KB—✓3rd
https://medium.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/625261456364/main.js?13 KB—✓3rd
https://cdn-client.medium.com/lite/static/js/HomeLoLegacyPage.MainContent.eb0cf9a0.chunk.js5 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
1.7 MB transferred, 38 requests
REVIEW
1.7 MB transferred, 38 requests
Info::
Page weighs 5.4 MB (1.7 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Info::
38 HTTP requests
Info::
Estimated 0.35 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
38 requests
0.35 g CO2 per page load
JavaScript 1.5 MiB 88%
Fonts 60.4 KiB 4%
Images 51.1 KiB 3%
CSS 42.8 KiB 3%
HTML 41.6 KiB 2%
Other 7.1 KiB 0%
Other 2.2 KiB 0%
Other 1.1 KiB 0%
Other 996 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

C
JS Execution Cost
Action
1150ms total JS execution
REVIEW
1150ms total JS execution
Warning::
https://cdn-client.medium.com/lite/static/js/2746....: 398ms CPU time
Info::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 238ms CPU time
Info::
https://cdn-client.medium.com/lite/static/js/main....: 168ms CPU time
Info::
https://medium.com/: 106ms CPU time
Info::
Unattributable: 92ms CPU time
Warning::
Third-party scripts: 1150ms (100% of total)

Main Thread Breakdown

Script Evaluation 73% Script Parsing & Compilation 9% Other 9% Style & Layout 6%
ScriptTotalScriptingParse/CompileParty
https://cdn-client.medium.com/lite/static/js/2746.1817984d.js398ms352ms25ms3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js238ms203ms28ms3rd
https://cdn-client.medium.com/lite/static/js/main.bacd74be.js168ms128ms36ms3rd
https://medium.com/106ms14ms2ms3rd
Unattributable92ms3ms0ms3rd
https://medium.com/cdn-cgi/challenge-platform/scripts/jsd/main.js78ms74ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7JY7T788PK70ms57ms12ms3rd
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 FCP 513 ms LCP 1.4 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
38 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 1150ms · 662KB · $15/mo
cdn-client.medium.com
Other
Costly
Execution 398ms
Transfer 255 KB
Unused 45%
Monthly Cost $5/mo
www.gstatic.com
Other
Costly
Execution 238ms
Transfer 0 KB
Unused 49%
Monthly Cost $3/mo
cdn-client.medium.com
Other
Optional
Execution 168ms
Transfer 246 KB
Unused 60%
Monthly Cost $2/mo
medium.com
Other
Optional
Execution 106ms
Transfer 14 KB
Monthly Cost $1/mo
Unattributable
Other
Optional
Execution 92ms
Transfer 0 KB
Monthly Cost $1/mo
medium.com
Other
Optional
Execution 78ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 70ms
Transfer 147 KB
Unused 42%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • cdn-client.medium.com adds 398ms and costs ~$5/month
  • www.gstatic.com adds 238ms 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 398ms 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 238ms 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

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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