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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
3
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
90
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.
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.

921 ms

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

964 ms

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

145 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.

2.21 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.

2.39 s

Page Load Progression

610 ms
1.2 s
1.8 s
2.4 s
3.1 s
3.7 s
4.3 s
4.9 s
Checks
14
5 PASS 4 REVIEW 3 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 Bundles
Action
33 scripts, 708 KB unused
FIX
33 scripts, 708 KB unused
Warning::
https://static.cdninstagram.com/rsrc.php/v4iYwz4/y...: 116 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.cdninstagram.com/rsrc.php/v4iF2A4/y...: 115 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.cdninstagram.com/rsrc.php/v4i_Lc4/y...: 106 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.cdninstagram.com/rsrc.php/v4iMRr4/y...: 90 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.cdninstagram.com/rsrc.php/v4i5wH4/y...: 89 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 708 KB
708 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 KB116 KB (63%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4iF2A4/y9/l/en_US-j/tGoAngMWAex.js234 KB115 KB (49%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4i_Lc4/y7/l/en_US-j/fImsRrfQN-B.js126 KB106 KB (84%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4iMRr4/yk/l/en_US-j/BxWsmc26SVx.js188 KB90 KB (48%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4i5wH4/y_/l/en_US-j/-FRlI3fWEL-H8LGx-iC5ORlBK6n6_KCaAt3px0zJtIL0RYb5vI1kyvR.js186 KB89 KB (48%)✓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 KB38 KB (52%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4ib1W4/yf/l/en_US-j/mgQdedE4AZ_.js39 KB35 KB (90%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4iEOb4/ys/l/en_US-j/6W0RX_TG6FA.js39 KB24 KB (63%)✓3rd
https://static.cdninstagram.com/rsrc.php/v4iaMz4/ys/l/en_US-j/a1fYfLgOBoT.js29 KB23 KB (80%)✓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, 45 requests
REVIEW
1.5 MB transferred, 45 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::
45 HTTP requests
Info::
Estimated 0.31 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
45 requests
0.31 g CO2 per page load
JavaScript 1.2 MiB 84%
HTML 124.3 KiB 8%
CSS 61.2 KiB 4%
Images 28.7 KiB 2%
Other 16.2 KiB 1%
Other 15.5 KiB 1%
Other 656 B 0%
Other 228 B 0%
Other 176 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
6 images, 0 KB saveable
REVIEW
6 images, 0 KB saveable
Info::
All images are well-optimized
6 images 29 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1337ms total JS execution
REVIEW
1337ms total JS execution
Warning::
https://static.cdninstagram.com/rsrc.php/v4/yA/r/D...: 826ms CPU time
Info::
https://www.threads.com/: 220ms CPU time
Info::
Unattributable: 172ms CPU time
Info::
https://static.cdninstagram.com/rsrc.php/v4iF2A4/y...: 63ms CPU time
Info::
https://static.cdninstagram.com/rsrc.php/v4iMRr4/y...: 56ms CPU time
Warning::
Third-party scripts: 1337ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Other 19% Script Parsing & Compilation 12% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://static.cdninstagram.com/rsrc.php/v4/yA/r/DW7-1bEC0OV.js826ms721ms16ms3rd
https://www.threads.com/220ms11ms0ms3rd
Unattributable172ms10ms0ms3rd
https://static.cdninstagram.com/rsrc.php/v4iF2A4/y9/l/en_US-j/tGoAngMWAex.js63ms27ms27ms3rd
https://static.cdninstagram.com/rsrc.php/v4iMRr4/yk/l/en_US-j/BxWsmc26SVx.js56ms18ms23ms3rd
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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
45 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 1337ms · 621KB · $18/mo
static.cdninstagram.com
Other
Costly
Execution 826ms
Transfer 74 KB
Unused 52%
Monthly Cost $11/mo
www.threads.com
Other
Costly
Execution 220ms
Transfer 124 KB
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 172ms
Transfer 0 KB
Monthly Cost $2/mo
static.cdninstagram.com
Other
Optional
Execution 63ms
Transfer 234 KB
Unused 49%
Monthly Cost $1/mo
static.cdninstagram.com
Other
Optional
Execution 56ms
Transfer 188 KB
Unused 48%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • static.cdninstagram.com adds 826ms and costs ~$11/month
  • www.threads.com adds 220ms 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

static.cdninstagram.com takes 826ms 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

52% 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

www.threads.com takes 220ms 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

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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