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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
38
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
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.
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.

3.40 s

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

12.56 s

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

1.19 s

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

0.085

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

5.93 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.

12.70 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
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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5085ms total JS execution
FIX
5085ms total JS execution
Warning::
https://static.cdninstagram.com/rsrc.php/v4/yA/r/D...: 3084ms CPU time
Warning::
Unattributable: 592ms CPU time
Warning::
https://www.threads.com/: 545ms CPU time
Warning::
https://static.cdninstagram.com/rsrc.php/v4iMRr4/y...: 284ms CPU time
Warning::
https://static.cdninstagram.com/rsrc.php/v4iF2A4/y...: 267ms CPU time
Warning::
Third-party scripts: 5085ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 18% Script Parsing & Compilation 13% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://static.cdninstagram.com/rsrc.php/v4/yA/r/DW7-1bEC0OV.js3084ms2626ms80ms3rd
Unattributable592ms32ms0ms3rd
https://www.threads.com/545ms40ms1ms3rd
https://static.cdninstagram.com/rsrc.php/v4iMRr4/yk/l/en_US-j/BxWsmc26SVx.js284ms56ms81ms3rd
https://static.cdninstagram.com/rsrc.php/v4iF2A4/y9/l/en_US-j/tGoAngMWAex.js267ms114ms118ms3rd
https://static.cdninstagram.com/rsrc.php/v4iDeJ4/yn/l/en_US-j/-FRlI3fWEL-H8LGx-iC5ORlBK6n6_KCaAt3px0zJtIL0AO9n9ebE9Q_RYb5vI1kyvR.js117ms10ms106ms3rd
https://static.cdninstagram.com/rsrc.php/v4iYwz4/ya/l/en_US-j/WPt8LwgsxrM.js116ms14ms94ms3rd
https://static.cdninstagram.com/rsrc.php/v4i_Lc4/y7/l/en_US-j/fImsRrfQN-B.js81ms15ms65ms3rd
F
JS Bundles
Action
33 scripts, 704 KB unused
FIX
33 scripts, 704 KB unused
Warning::
https://static.cdninstagram.com/rsrc.php/v4iYwz4/y...: 114 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.cdninstagram.com/rsrc.php/v4iF2A4/y...: 108 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.cdninstagram.com/rsrc.php/v4i_Lc4/y...: 104 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.cdninstagram.com/rsrc.php/v4iDeJ4/y...: 93 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.cdninstagram.com/rsrc.php/v4iMRr4/y...: 91 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 704 KB
704 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.cdninstagram.com/rsrc.php/v4iYwz4/ya/l/en_US-j/WPt8LwgsxrM.js184 KB114 KB (62%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4iF2A4/y9/l/en_US-j/tGoAngMWAex.js234 KB108 KB (46%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4i_Lc4/y7/l/en_US-j/fImsRrfQN-B.js126 KB104 KB (83%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4iDeJ4/yn/l/en_US-j/-FRlI3fWEL-H8LGx-iC5ORlBK6n6_KCaAt3px0zJtIL0AO9n9ebE9Q_RYb5vI1kyvR.js187 KB93 KB (50%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4iMRr4/yk/l/en_US-j/BxWsmc26SVx.js188 KB91 KB (49%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4i6pM4/yn/l/en_US-j/Rwn7y3YOgnB.js78 KB72 KB (93%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4/yA/r/DW7-1bEC0OV.js74 KB36 KB (49%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4ib1W4/yf/l/en_US-j/mgQdedE4AZ_.js39 KB36 KB (93%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4iaMz4/ys/l/en_US-j/a1fYfLgOBoT.js29 KB24 KB (81%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4iEOb4/ys/l/en_US-j/6W0RX_TG6FA.js39 KB24 KB (62%)✓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

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
Page Weight Budget
1.5 MB transferred, 44 requests
REVIEW
1.5 MB transferred, 44 requests
Info::
Page weighs 6.3 MB (1.5 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
44 HTTP requests
Info::
Estimated 0.31 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
44 requests
0.31 g CO2 per page load
JavaScript 1.2 MiB 84%
HTML 119.5 KiB 8%
CSS 61.2 KiB 4%
Images 18.2 KiB 1%
Other 18.1 KiB 1%
Other 16.2 KiB 1%
Other 648 B 0%
Other 228 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
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
4 images, 0 KB saveable
PASS
4 images, 0 KB saveable
Info::
All images are well-optimized
4 images 18 KB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
9 hints, 0 missing preconnects
PASS
9 hints, 0 missing preconnects
Info::
Page uses 9 resource hint(s)

Current Resource Hints

preconnect
—
preload
9
dns-prefetch
—
prefetch
—

9 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
Network Waterfall
44 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 5085ms · 1113KB · $68/mo
static.cdninstagram.com
Other
Costly
Execution 3084ms
Transfer 74 KB
Unused 49%
Monthly Cost $41/mo
Unattributable
Other
Costly
Execution 592ms
Transfer 0 KB
Monthly Cost $8/mo
www.threads.com
Other
Costly
Execution 545ms
Transfer 120 KB
Monthly Cost $7/mo
static.cdninstagram.com
Other
Costly
Execution 284ms
Transfer 188 KB
Unused 49%
Monthly Cost $4/mo
static.cdninstagram.com
Other
Costly
Execution 267ms
Transfer 234 KB
Unused 46%
Monthly Cost $4/mo
static.cdninstagram.com
Other
Optional
Execution 117ms
Transfer 187 KB
Unused 50%
Monthly Cost $2/mo
static.cdninstagram.com
Other
Optional
Execution 116ms
Transfer 184 KB
Unused 62%
Monthly Cost $2/mo
static.cdninstagram.com
Other
Optional
Execution 81ms
Transfer 126 KB
Unused 83%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • static.cdninstagram.com adds 3084ms and costs ~$41/month
  • Unattributable adds 592ms and costs ~$8/month
  • www.threads.com adds 545ms and costs ~$7/month
  • static.cdninstagram.com adds 284ms and costs ~$4/month
  • static.cdninstagram.com adds 267ms and costs ~$4/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

static.cdninstagram.com takes 3084ms 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 592ms 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.threads.com takes 545ms 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

static.cdninstagram.com takes 284ms 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

static.cdninstagram.com takes 267ms 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

62% of static.cdninstagram.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

83% of static.cdninstagram.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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