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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
34
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

6.88 s

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

18.86 s

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

960 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.

10.82 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.

19.44 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
16
8 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
24.7 MB transferred, 145 requests
FIX
24.7 MB transferred, 145 requests
Critical::
Page weighs 26.8 MB (24.7 MB transferred)
Warning::
Images are 23.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 23.0 MB
Info::
Fonts are 855 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 855 KB
Warning::
JavaScript is 713 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 713 KB
Warning::
145 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 5.2 g CO2 per page load
24.7 MB / 2.4 MB budget
24.7 MB transferred
145 requests
5.2 g CO2 per page load
Images 23.0 MiB 93%
Fonts 855.3 KiB 3%
JavaScript 712.5 KiB 3%
HTML 73.2 KiB 0%
CSS 71.9 KiB 0%
Other 13.8 KiB 0%
Other 12.9 KiB 0%
Other 826 B 0%
Other 0 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

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

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

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 (24.7 MiB of 24.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6988ms total JS execution
FIX
6988ms total JS execution
Warning::
https://hashnode.com/_next/static/chunks/ae0516f9c...: 2202ms CPU time
Warning::
Unattributable: 2123ms CPU time
Warning::
https://ping.hashnode.com/gtag/js?id=G-72XG3F8LNJ: 988ms CPU time
Warning::
https://hashnode.com/_next/static/chunks/faf4a0202...: 609ms CPU time
Warning::
https://hashnode.com/: 441ms CPU time
Warning::
Third-party scripts: 6988ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Other 31% Style & Layout 10% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://hashnode.com/_next/static/chunks/ae0516f9cf0e7561.js2202ms2011ms43ms3rd
Unattributable2123ms52ms0ms3rd
https://ping.hashnode.com/gtag/js?id=G-72XG3F8LNJ988ms700ms67ms3rd
https://hashnode.com/_next/static/chunks/faf4a0202735b81c.js609ms517ms1ms3rd
https://hashnode.com/441ms79ms41ms3rd
https://hashnode.com/_next/static/chunks/d43fa2c261a15769.js386ms50ms21ms3rd
https://hashnode.com/_next/static/chunks/5d420d97975eccac.js113ms78ms18ms3rd
https://hashnode.com/_next/static/chunks/2046bca9a9daa3cb.js72ms7ms17ms3rd
https://hashnode.com/_next/static/chunks/6826dffb999e18eb.js54ms1ms53ms3rd
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.

B
Image Optimization
79 images, 0 KB saveable
REVIEW
79 images, 0 KB saveable
Info::
All images are well-optimized
79 images 23.0 MB
0 oversized -0 KB
68 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
28 scripts, 199 KB unused
REVIEW
28 scripts, 199 KB unused
Warning::
https://ping.hashnode.com/gtag/js?id=G-72XG3F8LNJ: 58 KB unused (28%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://hashnode.com/_next/static/chunks/ae0516f9c...: 50 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://hashnode.com/_next/static/chunks/6826dffb9...: 43 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://us-assets.i.posthog.com/static/surveys.js?...: 25 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://hashnode.com/_next/static/chunks/d43fa2c26...: 22 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 199 KB
199 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ping.hashnode.com/gtag/js?id=G-72XG3F8LNJ205 KB58 KB (28%)✓3rd
https://hashnode.com/_next/static/chunks/ae0516f9cf0e7561.js125 KB50 KB (41%)✓3rd
https://hashnode.com/_next/static/chunks/6826dffb999e18eb.js75 KB43 KB (61%)✓3rd
https://us-assets.i.posthog.com/static/surveys.js?v=1.357.132 KB25 KB (80%)✓3rd
https://hashnode.com/_next/static/chunks/d43fa2c261a15769.js38 KB22 KB (60%)✓3rd
https://hashnode.com/_next/static/chunks/89bcb98f518389a3.js12 KB—✓3rd
https://hashnode.com/_next/static/chunks/8c045503bec64188.js12 KB—✓3rd
https://hashnode.com/_next/static/chunks/73e3194f06db260e.js8 KB—✓3rd
https://hashnode.com/_next/static/chunks/2939a275487cf6ef.js10 KB—✓3rd
https://hashnode.com/_next/static/chunks/2963de8af5bf4d07.js9 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

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
13 fonts (855 KB)
PASS
13 fonts (855 KB)
Info::
13 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

13

855 KB total

Render-blocking

0

of 13

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 16.0 s 18.0 s FCP 6.9 s LCP 18.9 shttps://hashnode.com/_next/static/media/SuisseIntlMono_Bold_WebS-s.p.3f449a12.woff2SuisseIntlMono_Bold_Web... https://hashnode.com/_next/static/media/SuisseIntlMono_Bold_WebS-s.p.3f449a12.woff2 — 13.8 KiB — 0 ms — font-display: swaphttps://hashnode.com/_next/static/media/SuisseIntlMono_Regular_WebS-s.p.8b264ba5.woff2SuisseIntlMono_Regular_... https://hashnode.com/_next/static/media/SuisseIntlMono_Regular_WebS-s.p.8b264ba5.woff2 — 13.8 KiB — 0 ms — font-display: swaphttps://hashnode.com/_next/static/media/SuisseIntlMono_Thin_WebS-s.p.e0d1588b.woff2SuisseIntlMono_Thin_Web... https://hashnode.com/_next/static/media/SuisseIntlMono_Thin_WebS-s.p.e0d1588b.woff2 — 13.9 KiB — 0 ms — font-display: swaphttps://hashnode.com/_next/static/media/SuisseIntl_Bold-s.p.85ec0343.woff2SuisseIntl_Bold-s.p.85e... https://hashnode.com/_next/static/media/SuisseIntl_Bold-s.p.85ec0343.woff2 — 64.0 KiB — 0 ms — font-display: swaphttps://hashnode.com/_next/static/media/SuisseIntl_BoldIt-s.p.57c67576.woff2SuisseIntl_BoldIt-s.p.5... https://hashnode.com/_next/static/media/SuisseIntl_BoldIt-s.p.57c67576.woff2 — 49.0 KiB — 0 ms — font-display: swaphttps://hashnode.com/_next/static/media/SuisseIntl_Medium-s.p.921e0693.woff2SuisseIntl_Medium-s.p.9... https://hashnode.com/_next/static/media/SuisseIntl_Medium-s.p.921e0693.woff2 — 65.1 KiB — 0 ms — font-display: swaphttps://hashnode.com/_next/static/media/SuisseIntl_MediumIt-s.p.05dd1830.woff2SuisseIntl_MediumIt-s.p... https://hashnode.com/_next/static/media/SuisseIntl_MediumIt-s.p.05dd1830.woff2 — 49.8 KiB — 0 ms — font-display: swaphttps://hashnode.com/_next/static/media/SuisseIntl_Regular-s.p.1b321929.woff2SuisseIntl_Regular-s.p.... https://hashnode.com/_next/static/media/SuisseIntl_Regular-s.p.1b321929.woff2 — 61.0 KiB — 0 ms — font-display: swaphttps://hashnode.com/_next/static/media/SuisseIntl_RegularIt-s.p.557e35b8.woff2SuisseIntl_RegularIt-s.... https://hashnode.com/_next/static/media/SuisseIntl_RegularIt-s.p.557e35b8.woff2 — 45.6 KiB — 0 ms — font-display: swaphttps://hashnode.com/_next/static/media/SuisseIntl_Semibold-s.p.169cec61.woff2SuisseIntl_Semibold-s.p... https://hashnode.com/_next/static/media/SuisseIntl_Semibold-s.p.169cec61.woff2 — 65.7 KiB — 0 ms — font-display: swaphttps://hashnode.com/_next/static/media/SuisseIntl_SemiboldIt-s.p.63924a3e.woff2SuisseIntl_SemiboldIt-s... https://hashnode.com/_next/static/media/SuisseIntl_SemiboldIt-s.p.63924a3e.woff2 — 50.5 KiB — 0 ms — font-display: swaphttps://hashnode.com/_next/static/media/fa-regular-400.6b955cc3.woff2fa-regular-400.6b955cc3... https://hashnode.com/_next/static/media/fa-regular-400.6b955cc3.woff2 — 325.9 KiB — 0 ms — font-display: swaphttps://hashnode.com/_next/static/media/fa-jelly-regular-400.566fddeb.woff2fa-jelly-regular-400.56... https://hashnode.com/_next/static/media/fa-jelly-regular-400.566fddeb.woff2 — 37.1 KiB — 0 ms — font-display: swap
SuisseIntlMono_Bold_Web... woff2 swap
Size 14 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
SuisseIntlMono_Regular_... woff2 swap
Size 14 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
SuisseIntlMono_Thin_Web... woff2 swap
Size 14 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
SuisseIntl_Bold-s.p.85e... woff2 swap
Size 64 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
SuisseIntl_BoldIt-s.p.5... woff2 swap
Size 49 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
SuisseIntl_Medium-s.p.9... woff2 swap
Size 65 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
SuisseIntl_MediumIt-s.p... woff2 swap
Size 50 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
SuisseIntl_Regular-s.p.... woff2 swap
Size 61 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
SuisseIntl_RegularIt-s.... woff2 swap
Size 46 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
SuisseIntl_Semibold-s.p... woff2 swap
Size 66 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
SuisseIntl_SemiboldIt-s... woff2 swap
Size 50 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.6b955cc3... woff2 swap
Size 326 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-jelly-regular-400.56... woff2 swap
Size 37 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 ~163 KB and ~326 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
54 hints, 0 missing preconnects
PASS
54 hints, 0 missing preconnects
Info::
Page uses 54 resource hint(s)

Current Resource Hints

preconnect
—
preload
+44
54
dns-prefetch
—
prefetch
—

54 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
145 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 6988ms · 575KB · €112/mo
hashnode.com
Other
Costly
Execution 2202ms
Transfer 125 KB
Unused 41%
Monthly Cost €35/mo
Unattributable
Other
Costly
Execution 2123ms
Transfer 0 KB
Monthly Cost €34/mo
ping.hashnode.com
Other
Costly
Execution 988ms
Transfer 205 KB
Unused 28%
Monthly Cost €16/mo
hashnode.com
Other
Costly
Execution 609ms
Transfer 1 KB
Monthly Cost €10/mo
hashnode.com
Other
Costly
Execution 441ms
Transfer 71 KB
Monthly Cost €7/mo
hashnode.com
Other
Costly
Execution 386ms
Transfer 38 KB
Unused 60%
Monthly Cost €6/mo
hashnode.com
Other
Optional
Execution 113ms
Transfer 30 KB
Monthly Cost €2/mo
hashnode.com
Other
Optional
Execution 72ms
Transfer 29 KB
Monthly Cost €1/mo
hashnode.com
Other
Optional
Execution 54ms
Transfer 75 KB
Unused 61%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • hashnode.com adds 2202ms and costs ~€35/month
  • Unattributable adds 2123ms and costs ~€34/month
  • ping.hashnode.com adds 988ms and costs ~€16/month
  • hashnode.com adds 609ms and costs ~€10/month
  • hashnode.com adds 441ms and costs ~€7/month
  • hashnode.com adds 386ms and costs ~€6/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

hashnode.com takes 2202ms 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 2123ms 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

ping.hashnode.com takes 988ms 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

hashnode.com takes 609ms 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

hashnode.com takes 441ms 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

hashnode.com takes 386ms 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 hashnode.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

61% of hashnode.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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