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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
54
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
77
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.
92
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.

2.29 s

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

3.47 s

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

2.08 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.

6.95 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.

19.33 s

Page Load Progression

905 ms
1.8 s
2.7 s
3.6 s
4.5 s
5.4 s
6.3 s
7.2 s
Checks
16
7 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
2.6 MB transferred, 119 requests
FIX
2.6 MB transferred, 119 requests
Warning::
Page weighs 10.4 MB (2.6 MB transferred)
Warning::
JavaScript is 2.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.0 MB
Warning::
119 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.55 g CO2 per page load
2.6 MB / 2.4 MB budget
2.6 MB transferred
119 requests
0.55 g CO2 per page load
JavaScript 2.0 MiB 76%
Images 411.7 KiB 15%
HTML 163.7 KiB 6%
Fonts 28.2 KiB 1%
Other 13.3 KiB 0%
Other 12.4 KiB 0%
CSS 6.4 KiB 0%
Other 1.4 KiB 0%
Other 1.1 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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
94% third-party, 0 ms blocking
FIX
94% third-party, 0 ms blocking
Warning::
Third-party code accounts for 94% of page weight (2.5 MiB of 2.6 MiB)
Info::
Third-party blocking time is low (0 ms)
94%
First-party Third-party
F
JS Execution Cost
Action
9871ms total JS execution
FIX
9871ms total JS execution
Warning::
https://static-assets-web.flixcart.com/batman-retu...: 4122ms CPU time
Warning::
https://www.flipkart.com/: 2433ms CPU time
Warning::
https://static-assets-web.flixcart.com/batman-retu...: 1504ms CPU time
Warning::
Unattributable: 846ms CPU time
Warning::
https://static-assets-web.flixcart.com/batman-retu...: 318ms CPU time
Warning::
Third-party scripts: 7437ms (75% of total)

Main Thread Breakdown

Script Evaluation 51% Other 23% Style & Layout 10% Script Parsing & Compilation 9% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/app.js4122ms3793ms79ms3rd
https://www.flipkart.com/2433ms596ms139ms1st
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/fkvendor.js1504ms240ms34ms3rd
Unattributable846ms48ms0ms3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/MultiWidgetpage.js318ms5ms313ms3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/CrossPlatformModules.js295ms245ms32ms3rd
https://js-agent.newrelic.com/page_view_event-aggregate.06482edd-1.236.0.min.js123ms106ms1ms3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/MapiActionNonCriticalActions.js87ms4ms83ms3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/BaseActionNonCritical.js81ms7ms73ms3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/CrossCommon.js61ms1ms59ms3rd
F
JS Bundles
Action
27 scripts, 1.3 MB unused
FIX
27 scripts, 1.3 MB unused
Warning::
https://static-assets-web.flixcart.com/batman-retu...: 503 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static-assets-web.flixcart.com/batman-retu...: 206 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static-assets-web.flixcart.com/batman-retu...: 176 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static-assets-web.flixcart.com/batman-retu...: 87 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static-assets-web.flixcart.com/batman-retu...: 77 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.3 MB
1347 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/MultiWidgetpage.js844 KB503 KB (60%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/MapiActionNonCriticalActions.js210 KB206 KB (100%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/BaseActionNonCritical.js177 KB176 KB (100%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/CrossCommon.js127 KB87 KB (69%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/app.js186 KB77 KB (41%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/OVHomePageTS.js101 KB75 KB (74%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/CrossPlatformModules.js119 KB68 KB (57%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/HomePageNonCriticalActions.js67 KB66 KB (98%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/fkvendor.js86 KB40 KB (47%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/329f3907cb96d278607b538ca58c0ea0/OmnitureLazyChunk.js29 KB28 KB (99%)✓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
Image Optimization
51 images, 0 KB saveable
REVIEW
51 images, 0 KB saveable
Info::
All images are well-optimized
51 images 412 KB
0 oversized -0 KB
14 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
3 fonts (28 KB)
PASS
3 fonts (28 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

28 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 2.3 s LCP 3.5 shttps://static-assets-web.flixcart.com/batman-returns/batman-returns/p/fonts/Inter-Regular.woff2Inter-Regular.woff2 https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/fonts/Inter-Regular.woff2 — 7.7 KiB — 0 ms — font-display: swaphttps://static-assets-web.flixcart.com/batman-returns/batman-returns/p/fonts/Inter-SemiBold.woff2Inter-SemiBold.woff2 https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/fonts/Inter-SemiBold.woff2 — 7.9 KiB — 0 ms — font-display: swaphttps://static-assets-web.flixcart.com/batman-returns/batman-returns/p/fonts/Inter-Bold.woff2Inter-Bold.woff2 https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/fonts/Inter-Bold.woff2 — 12.5 KiB — 0 ms — font-display: swap
Inter-Regular.woff2 woff2 swap
Size 8 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Inter-SemiBold.woff2 woff2 swap
Size 8 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Inter-Bold.woff2 woff2 swap
Size 13 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)
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
27 hints, 0 missing preconnects
PASS
27 hints, 0 missing preconnects
Info::
Page uses 27 resource hint(s)

Current Resource Hints

preconnect
2
preload
+13
23
dns-prefetch
2
prefetch
—

27 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
119 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
75% of JavaScript execution is third-party
First-party Third-party 7437ms · 1752KB · ₹9/mo
static-assets-web.flixcart.com
Other
Costly
Execution 4122ms
Transfer 186 KB
Unused 41%
Monthly Cost ₹5/mo
static-assets-web.flixcart.com
Other
Costly
Execution 1504ms
Transfer 86 KB
Unused 47%
Monthly Cost ₹2/mo
Unattributable
Other
Costly
Execution 846ms
Transfer 0 KB
Monthly Cost ₹1/mo
static-assets-web.flixcart.com
Other
Costly
Execution 318ms
Transfer 844 KB
Unused 60%
Monthly Cost ₹0/mo
static-assets-web.flixcart.com
Other
Costly
Execution 295ms
Transfer 119 KB
Unused 57%
Monthly Cost ₹0/mo
js-agent.newrelic.com
Other
Optional
Execution 123ms
Transfer 4 KB
Monthly Cost ₹0/mo
static-assets-web.flixcart.com
Other
Optional
Execution 87ms
Transfer 210 KB
Unused 100%
Monthly Cost ₹0/mo
static-assets-web.flixcart.com
Other
Optional
Execution 81ms
Transfer 177 KB
Unused 100%
Monthly Cost ₹0/mo
static-assets-web.flixcart.com
Other
Optional
Execution 61ms
Transfer 127 KB
Unused 69%
Monthly Cost ₹0/mo

These scripts may cost more than they're worth

  • static-assets-web.flixcart.com adds 4122ms and costs ~₹5/month
  • static-assets-web.flixcart.com adds 1504ms and costs ~₹2/month
  • Unattributable adds 846ms and costs ~₹1/month
  • static-assets-web.flixcart.com adds 318ms and costs ~₹0/month
  • static-assets-web.flixcart.com adds 295ms and costs ~₹0/month

75% 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-assets-web.flixcart.com takes 4122ms 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-assets-web.flixcart.com takes 1504ms 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 846ms 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-assets-web.flixcart.com takes 318ms 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 static-assets-web.flixcart.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

static-assets-web.flixcart.com takes 295ms 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

57% of static-assets-web.flixcart.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

100% of static-assets-web.flixcart.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

100% of static-assets-web.flixcart.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

69% of static-assets-web.flixcart.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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