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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
32
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.

3.53 s

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

13.12 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.

0.000

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

7.62 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.

13.50 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
7 PASS 3 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 (1.9 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
7693ms total JS execution
FIX
7693ms total JS execution
Warning::
https://static.cdninstagram.com/rsrc.php/v4/yA/r/D...: 4674ms CPU time
Warning::
https://www.threads.com/: 782ms CPU time
Warning::
Unattributable: 714ms CPU time
Warning::
https://static.cdninstagram.com/rsrc.php/v4iMRr4/y...: 565ms CPU time
Warning::
https://static.cdninstagram.com/rsrc.php/v4iF2A4/y...: 371ms CPU time
Warning::
Third-party scripts: 7693ms (100% of total)

Main Thread Breakdown

Script Evaluation 56% Other 16% Script Parsing & Compilation 14% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://static.cdninstagram.com/rsrc.php/v4/yA/r/DW7-1bEC0OV.js4674ms3934ms113ms3rd
https://www.threads.com/782ms51ms1ms3rd
Unattributable714ms45ms0ms3rd
https://static.cdninstagram.com/rsrc.php/v4iMRr4/yk/l/en_US-j/BxWsmc26SVx.js565ms165ms135ms3rd
https://static.cdninstagram.com/rsrc.php/v4iF2A4/y9/l/en_US-j/tGoAngMWAex.js371ms125ms186ms3rd
https://static.cdninstagram.com/rsrc.php/v4iDeJ4/yn/l/en_US-j/-FRlI3fWEL-H8LGx-iC5ORlBK6n6_KCaAt3px0zJtIL0AO9n9ebE9Q_RYb5vI1kyvR.js199ms17ms181ms3rd
https://static.cdninstagram.com/rsrc.php/v4iYwz4/ya/l/en_US-j/WPt8LwgsxrM.js195ms22ms162ms3rd
https://static.cdninstagram.com/rsrc.php/v4i_Lc4/y7/l/en_US-j/fImsRrfQN-B.js137ms16ms89ms3rd
https://static.cdninstagram.com/rsrc.php/v4i6pM4/yn/l/en_US-j/Rwn7y3YOgnB.js58ms5ms51ms3rd
F
JS Bundles
Action
34 scripts, 690 KB unused
FIX
34 scripts, 690 KB unused
Warning::
https://static.cdninstagram.com/rsrc.php/v4iYwz4/y...: 108 KB unused (59%)
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/v4iF2A4/y...: 101 KB unused (43%)
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...: 92 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 690 KB
690 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 KB108 KB (59%)✓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/v4iF2A4/y9/l/en_US-j/tGoAngMWAex.js234 KB101 KB (43%)✓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 KB92 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 (82%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4iEOb4/ys/l/en_US-j/6W0RX_TG6FA.js39 KB23 KB (61%)✓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.

C
Page Weight Budget
Action
1.9 MB transferred, 50 requests
REVIEW
1.9 MB transferred, 50 requests
Info::
Page weighs 6.7 MB (1.9 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::
50 HTTP requests
Info::
Estimated 0.40 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
50 requests
0.40 g CO2 per page load
JavaScript 1.2 MiB 65%
Images 459.8 KiB 24%
HTML 116.8 KiB 6%
CSS 61.2 KiB 3%
Other 23.4 KiB 1%
Other 16.2 KiB 1%
Other 650 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

B
Image Optimization
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Info::
All images are well-optimized
9 images 460 KB
0 oversized -0 KB
8 legacy format
0 missing dimensions CLS risk
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+
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
50 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 7693ms · 1189KB · $102/mo
static.cdninstagram.com
Other
Costly
Execution 4674ms
Transfer 74 KB
Unused 49%
Monthly Cost $62/mo
www.threads.com
Other
Costly
Execution 782ms
Transfer 117 KB
Monthly Cost $10/mo
Unattributable
Other
Costly
Execution 714ms
Transfer 0 KB
Monthly Cost $9/mo
static.cdninstagram.com
Other
Costly
Execution 565ms
Transfer 188 KB
Unused 49%
Monthly Cost $8/mo
static.cdninstagram.com
Other
Costly
Execution 371ms
Transfer 234 KB
Unused 43%
Monthly Cost $5/mo
static.cdninstagram.com
Other
Optional
Execution 199ms
Transfer 187 KB
Unused 50%
Monthly Cost $3/mo
static.cdninstagram.com
Other
Optional
Execution 195ms
Transfer 184 KB
Unused 59%
Monthly Cost $3/mo
static.cdninstagram.com
Other
Optional
Execution 137ms
Transfer 126 KB
Unused 83%
Monthly Cost $2/mo
static.cdninstagram.com
Other
Optional
Execution 58ms
Transfer 78 KB
Unused 93%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • static.cdninstagram.com adds 4674ms and costs ~$62/month
  • www.threads.com adds 782ms and costs ~$10/month
  • Unattributable adds 714ms and costs ~$9/month
  • static.cdninstagram.com adds 565ms and costs ~$8/month
  • static.cdninstagram.com adds 371ms and costs ~$5/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 4674ms 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 782ms 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 714ms 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 565ms 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 371ms 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

59% 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

93% 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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