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https://www.snapchat.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
4
REVIEW
1
PASS
9
INFO
2

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

Mobile Desktop
36
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

1.97 s

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

11.12 s

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

2.11 s

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

0.001

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

13.29 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.

72.42 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
9 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
14.1 MB transferred, 67 requests
FIX
14.1 MB transferred, 67 requests
Critical::
Page weighs 14.9 MB (14.1 MB transferred)
Warning::
JavaScript is 12.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 12.0 MB
Warning::
Images are 1.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.5 MB
Info::
67 HTTP requests
Info::
Estimated 3.0 g CO2 per page load
14.1 MB / 2.4 MB budget
14.1 MB transferred
67 requests
3.0 g CO2 per page load
JavaScript 12.0 MiB 85%
Images 1.5 MiB 10%
Other 375.7 KiB 3%
Fonts 180.8 KiB 1%
HTML 43.0 KiB 0%
CSS 28.6 KiB 0%
Other 22.1 KiB 0%
Other 10.0 KiB 0%
Other 594 B 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

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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 (14.1 MiB of 14.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6779ms total JS execution
FIX
6779ms total JS execution
Warning::
https://static.snapchat.com/snapchat-dot-com/_next...: 3208ms CPU time
Warning::
https://static.snapchat.com/snapchat-dot-com/_next...: 1472ms CPU time
Warning::
Unattributable: 696ms CPU time
Warning::
https://www.snapchat.com/: 680ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DPDH...: 565ms CPU time
Warning::
Third-party scripts: 6099ms (90% of total)

Main Thread Breakdown

Script Evaluation 51% Script Parsing & Compilation 27% Other 9% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://static.snapchat.com/snapchat-dot-com/_next/static/chunks/pages/_app-0ad9e43c5ce9c3d8.js3208ms1619ms1556ms3rd
https://static.snapchat.com/snapchat-dot-com/_next/static/chunks/framework-41b02394b273386f.js1472ms1326ms25ms3rd
Unattributable696ms75ms0ms3rd
https://www.snapchat.com/680ms8ms1ms1st
https://www.googletagmanager.com/gtag/js?id=G-DPDHJB4310565ms304ms258ms3rd
https://static.snapchat.com/snapchat-dot-com/_next/static/chunks/main-2324219b5dd34d31.js104ms76ms26ms3rd
https://www.google-analytics.com/analytics.js54ms28ms25ms3rd
F
JS Bundles
Action
25 scripts, 8.7 MB unused
FIX
25 scripts, 8.7 MB unused
Warning::
https://static.snapchat.com/snapchat-dot-com/_next...: 8.6 MB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DPDH...: 66 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.snapchat.com/snapchat-dot-com/_next...: 27 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 8.7 MB
8943 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.snapchat.com/snapchat-dot-com/_next/static/chunks/pages/_app-0ad9e43c5ce9c3d8.js11956 KB8850 KB (76%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-DPDHJB4310169 KB66 KB (40%)✓3rd
https://static.snapchat.com/snapchat-dot-com/_next/static/chunks/main-2324219b5dd34d31.js51 KB27 KB (53%)✓3rd
https://static.snapchat.com/snapchat-dot-com/_next/static/chunks/4630.77cb43b65f5e1c81.js5 KB—✓3rd
https://static.snapchat.com/snapchat-dot-com/_next/static/chunks/2298.de8f2e7513101035.js2 KB—✓3rd
https://static.snapchat.com/snapchat-dot-com/_next/static/chunks/webpack-da1cb1501e637600.js6 KB—✓3rd
https://static.snapchat.com/snapchat-dot-com/_next/static/chunks/6018-a929ed8e96168083.js4 KB—✓3rd
https://static.snapchat.com/snapchat-dot-com/_next/static/chunks/1540-20a56721f07d4ed0.js4 KB—✓3rd
https://static.snapchat.com/snapchat-dot-com/_next/static/chunks/pages/index-4d8c485f82f083cd.js6 KB—✓3rd
https://static.snapchat.com/snapchat-dot-com/_next/static/OVOexCOz_k92F5c94RZO9/_buildManifest.js2 KB—✓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

B
Image Optimization
5 images, 0 KB saveable
REVIEW
5 images, 0 KB saveable
Warning::
https://static.snapchat.com/images/snapchatdotcom/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
5 images 1.5 MB
0 oversized -0 KB
5 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

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 (181 KB)
PASS
3 fonts (181 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

181 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 2.0 s LCP 11.1 shttps://static.snapchat.com/fonts/AvenirNext-Medium.woff2AvenirNext-Medium.woff2 https://static.snapchat.com/fonts/AvenirNext-Medium.woff2 — 58.7 KiB — 0 ms — font-display: swaphttps://static.snapchat.com/fonts/AvenirNext-DemiBold.woff2AvenirNext-DemiBold.woff2 https://static.snapchat.com/fonts/AvenirNext-DemiBold.woff2 — 58.8 KiB — 0 ms — font-display: swaphttps://static.snapchat.com/fonts/AvenirNext-Bold.woff2AvenirNext-Bold.woff2 https://static.snapchat.com/fonts/AvenirNext-Bold.woff2 — 63.3 KiB — 0 ms — font-display: swap
AvenirNext-Medium.woff2 woff2 swap
Size 59 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
AvenirNext-DemiBold.woff2 woff2 swap
Size 59 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
AvenirNext-Bold.woff2 woff2 swap
Size 63 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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
—
preload
4
dns-prefetch
—
prefetch
—

4 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

A+
HTTP Caching
max-age=10800 (3 hours)
PASS
max-age=10800 (3 hours)
Info::
Cache-Control header is set
Got: public, max-age=10800, s-maxage=10800, stale-while-revalidate=5400
Info::
Effective TTL: 3 hours (max-age=10800)
Info::
CDN TTL: 3 hours (s-maxage=10800)
Info::
ETag present — enables conditional (304) responses
Cache-Control

public, max-age=10800, s-maxage=10800, stale-while-revalidate=5400

DirectiveValueMeaning
public—Any cache may store this response
max-age10800Cache for 3 hours
s-maxage10800CDN caches for 3 hours
stale-while-revalidate5400Serve stale for 1 hour while fetching fresh
Effective TTL: 10800 seconds
Network Waterfall
67 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
90% of JavaScript execution is third-party
First-party Third-party 6099ms · 12241KB · $81/mo
static.snapchat.com
Other
Costly
Execution 3208ms
Transfer 11956 KB
Unused 76%
Monthly Cost $43/mo
static.snapchat.com
Other
Costly
Execution 1472ms
Transfer 44 KB
Monthly Cost $20/mo
Unattributable
Other
Costly
Execution 696ms
Transfer 0 KB
Monthly Cost $9/mo
Google Tag Manager
Tag Manager
Costly
Execution 565ms
Transfer 169 KB
Unused 40%
Monthly Cost $7/mo
static.snapchat.com
Other
Optional
Execution 104ms
Transfer 51 KB
Unused 53%
Monthly Cost $1/mo
Google Analytics
Analytics
Optional
Execution 54ms
Transfer 21 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • static.snapchat.com adds 3208ms and costs ~$43/month
  • static.snapchat.com adds 1472ms and costs ~$20/month
  • Unattributable adds 696ms and costs ~$9/month
  • Google Tag Manager adds 565ms and costs ~$7/month

90% 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.snapchat.com takes 3208ms 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

76% of static.snapchat.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.snapchat.com takes 1472ms 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 696ms 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

Google Tag Manager 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

53% of static.snapchat.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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