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Performance

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

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

Mobile Desktop
68
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
72
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.
85
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.

1.71 s

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

2.08 s

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

256 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.

2.86 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.

5.10 s

Page Load Progression

927 ms
1.9 s
2.8 s
3.7 s
4.6 s
5.6 s
6.5 s
7.4 s
Checks
14
5 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 170 requests
FIX
3.4 MB transferred, 170 requests
Warning::
Page weighs 12.7 MB (3.4 MB transferred)
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Warning::
170 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.72 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
170 requests
0.72 g CO2 per page load
JavaScript 2.4 MiB 69%
Images 853.6 KiB 24%
HTML 162.0 KiB 5%
Fonts 28.2 KiB 1%
CSS 11.1 KiB 0%
Other 7.2 KiB 0%
Other 6.3 KiB 0%
Other 1.5 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
95% third-party, 0 ms blocking
FIX
95% third-party, 0 ms blocking
Warning::
Third-party code accounts for 95% of page weight (3.3 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
95%
First-party Third-party
D
JS Execution Cost
Action
2104ms total JS execution
FIX
2104ms total JS execution
Warning::
https://static-assets-web.flixcart.com/batman-retu...: 810ms CPU time
Warning::
https://www.flipkart.com/: 789ms CPU time
Info::
Unattributable: 247ms CPU time
Info::
https://static-assets-web.flixcart.com/batman-retu...: 109ms CPU time
Info::
https://static-assets-web.flixcart.com/batman-retu...: 98ms CPU time
Warning::
Third-party scripts: 1315ms (62% of total)

Main Thread Breakdown

Script Evaluation 43% Other 25% Script Parsing & Compilation 12% Style & Layout 11% Rendering 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/0750db5012a218723773a10412a72bce/app.js810ms728ms15ms3rd
https://www.flipkart.com/789ms69ms21ms1st
Unattributable247ms21ms0ms3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/0750db5012a218723773a10412a72bce/MultiWidgetpage.js109ms2ms107ms3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/0750db5012a218723773a10412a72bce/CrossPlatformModules.js98ms79ms12ms3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/0750db5012a218723773a10412a72bce/fkvendor.js51ms22ms11ms3rd
F
JS Bundles
Action
27 scripts, 1.7 MB unused
FIX
27 scripts, 1.7 MB unused
Warning::
https://static-assets-web.flixcart.com/batman-retu...: 504 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static-assets-web.flixcart.com/batman-retu...: 428 KB unused (96%)
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...: 101 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.7 MB
1731 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/0750db5012a218723773a10412a72bce/MultiWidgetpage.js844 KB504 KB (60%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/0750db5012a218723773a10412a72bce/StorePageTS.js447 KB428 KB (96%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/0750db5012a218723773a10412a72bce/MapiActionNonCriticalActions.js210 KB206 KB (100%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/0750db5012a218723773a10412a72bce/BaseActionNonCritical.js177 KB176 KB (100%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/0750db5012a218723773a10412a72bce/OVHomePageTS.js101 KB101 KB (100%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/0750db5012a218723773a10412a72bce/CrossCommon.js127 KB88 KB (69%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/0750db5012a218723773a10412a72bce/app.js186 KB81 KB (43%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/0750db5012a218723773a10412a72bce/CrossPlatformModules.js119 KB59 KB (50%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/0750db5012a218723773a10412a72bce/fkvendor.js86 KB40 KB (47%)✓3rd
https://static-assets-web.flixcart.com/batman-returns/batman-returns/p/0750db5012a218723773a10412a72bce/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
89 images, 0 KB saveable
REVIEW
89 images, 0 KB saveable
Warning::
https://static-assets-web.flixcart.com/batman-retu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
89 images 854 KB
0 oversized -0 KB
34 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.7 s LCP 2.1 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
170 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
62% of JavaScript execution is third-party
First-party Third-party 1315ms · 1234KB · ₹2/mo
static-assets-web.flixcart.com
Other
Costly
Execution 810ms
Transfer 186 KB
Unused 43%
Monthly Cost ₹1/mo
Unattributable
Other
Costly
Execution 247ms
Transfer 0 KB
Monthly Cost ₹0/mo
static-assets-web.flixcart.com
Other
Optional
Execution 109ms
Transfer 844 KB
Unused 60%
Monthly Cost ₹0/mo
static-assets-web.flixcart.com
Other
Optional
Execution 98ms
Transfer 119 KB
Unused 50%
Monthly Cost ₹0/mo
static-assets-web.flixcart.com
Other
Optional
Execution 51ms
Transfer 86 KB
Unused 47%
Monthly Cost ₹0/mo

These scripts may cost more than they're worth

  • static-assets-web.flixcart.com adds 810ms and costs ~₹1/month
  • Unattributable adds 247ms and costs ~₹0/month

62% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

static-assets-web.flixcart.com takes 810ms 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 247ms 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

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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