Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
989 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.89 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.13 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.
2.59 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.
11.90 s
Page Load Progression
DThird-Party ImpactAction98% third-party, 0 ms blockingFIX
FJS Execution CostAction4632ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://cdn-client.medium.com/lite/static/js/2746.261ecfe2.js | 1641ms | 1449ms | 113ms | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 966ms | 813ms | 123ms | 3rd |
| https://cdn-client.medium.com/lite/static/js/main.df962949.js | 696ms | 537ms | 145ms | 3rd |
| Unattributable | 338ms | 12ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-7JY7T788PK | 326ms | 268ms | 56ms | 3rd |
| https://medium.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 301ms | 291ms | 4ms | 1st |
| https://medium.com/ | 246ms | 49ms | 8ms | 1st |
| https://cdn-client.medium.com/lite/static/js/HomeLoLegacyPage.MainContent.eb0cf9a0.chunk.js | 118ms | 115ms | 2ms | 3rd |
FJS BundlesAction13 scripts, 858 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 0 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 177 KB (49%) | ✓ | 3rd |
| https://cdn-client.medium.com/lite/static/js/main.df962949.js | 247 KB | 147 KB (60%) | ✓ | 3rd |
| https://cdn-client.medium.com/lite/static/js/2746.261ecfe2.js | 255 KB | 116 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-7JY7T788PK | 149 KB | 63 KB (42%) | ✓ | 3rd |
| https://cdn-client.medium.com/lite/static/js/instrumentation.bbc70038.chunk.js | 2 KB | — | ✓ | 3rd |
| https://cdn-client.medium.com/lite/static/js/HomeLoLegacyPage.MainContent.eb0cf9a0.chunk.js | 5 KB | — | ✓ | 3rd |
| https://static.cloudflareinsights.com/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c1241717689176015 | 7 KB | — | ✓ | 3rd |
| https://medium.com/cdn-cgi/challenge-platform/h/g/scripts/jsd/b0a7532ac8ec/main.js? | 12 KB | — | ✓ | 1st |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction35 resources · 1.6 MB · 858 KB savings availableFIX
~857.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 35 resources | 1.6 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
no-cache, no-store, max-age=0, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| no-cache | — | Cache but always revalidate first |
| no-store | — | Never cache this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
CPage Weight BudgetAction1.6 MB transferred, 35 requestsREVIEW
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization2 images, 0 KB saveablePASS
A+Font Loading3 fonts (60 KB)PASS
Web fonts
3
60 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- 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 ~8 KB and ~16 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall35 requests over 1535msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
cdn-client.medium.com cdn-client.medium.com | Other | 1641ms | 255 KB | 45% | $22/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 966ms | 0 KB | 49% | $13/mo | Costly |
cdn-client.medium.com cdn-client.medium.com | Other | 696ms | 247 KB | 60% | $9/mo | Costly |
Unattributable Unattributable | Other | 338ms | 0 KB | — | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 326ms | 149 KB | 42% | $4/mo | Costly |
cdn-client.medium.com cdn-client.medium.com | Other | 118ms | 5 KB | — | $2/mo | Optional |
These scripts may cost more than they're worth
- cdn-client.medium.com adds 1641ms and costs ~$22/month
- www.gstatic.com adds 966ms and costs ~$13/month
- cdn-client.medium.com adds 696ms and costs ~$9/month
- Unattributable adds 338ms and costs ~$4/month
- Google Tag Manager adds 326ms and costs ~$4/month
88% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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 1641ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.gstatic.com takes 966ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
cdn-client.medium.com takes 696ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
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.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
Unattributable takes 338ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 326ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev