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https://www.lucidmotors.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
80
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.
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.

1.52 s

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

1.96 s

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

124 ms

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.

2.24 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.

2.89 s

Page Load Progression

494 ms
988 ms
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
14
6 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
14.2 MB transferred, 51 requests
FIX
14.2 MB transferred, 51 requests
Critical::
Page weighs 18.3 MB (14.2 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
Fonts are 381 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 381 KB
Info::
51 HTTP requests
Info::
Estimated 3.0 g CO2 per page load
14.2 MB / 2.4 MB budget
14.2 MB transferred
51 requests
3.0 g CO2 per page load
Other 12.4 MiB 88%
JavaScript 1.1 MiB 8%
Fonts 381.0 KiB 3%
CSS 199.5 KiB 1%
HTML 41.0 KiB 0%
Other 4.9 KiB 0%
Other 1.3 KiB 0%
Other 458 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (14.2 MiB of 14.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
17 scripts, 432 KB unused
FIX
17 scripts, 432 KB unused
Warning::
https://lucidmotors.com/_next/static/chunks/634-03...: 127 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://lucidmotors.com/_next/static/chunks/89ddd2...: 84 KB unused (87%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W9C...: 71 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.optimizely.com/js/4942072910708736.js: 55 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://lucidmotors.com/_next/static/chunks/00c3fd...: 34 KB unused (91%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 432 KB
432 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://lucidmotors.com/_next/static/chunks/634-03fb50f8f72028d2.js358 KB127 KB (36%)✓3rd
https://lucidmotors.com/_next/static/chunks/89ddd23d-aafe56895c21422b.js97 KB84 KB (87%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W9CKZJ&gtm_auth=OcDGx7g4rvpwfYGPDufp2A&gtm_preview=env-2&gtm_cookies_win=x188 KB71 KB (38%)✓3rd
https://cdn.optimizely.com/js/4942072910708736.js115 KB55 KB (48%)✓3rd
https://lucidmotors.com/_next/static/chunks/00c3fd52-1d621a8b9eb7615e.js39 KB34 KB (91%)✓3rd
https://lucidmotors.com/_next/static/chunks/285-68b69379d88ab9a7.js66 KB32 KB (48%)✓3rd
https://lucidmotors.com/_next/static/chunks/app/%5B%5B...slug%5D%5D/page-107536b500328b89.js66 KB30 KB (46%)✓3rd
https://lucidmotors.com/_next/static/chunks/7bf36345-c27dd68a182fd2c1.js25 KB—✓3rd
https://lucidmotors.com/_next/static/chunks/7c09d4dc-1c88d7d8491dd3f0.js15 KB—✓3rd
https://lucidmotors.com/_next/static/chunks/206-b2ac887f41a6cfb7.js44 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

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
JS Execution Cost
Action
1170ms total JS execution
REVIEW
1170ms total JS execution
Warning::
https://lucidmotors.com/_next/static/chunks/18-734...: 338ms CPU time
Info::
https://lucidmotors.com/_next/static/chunks/634-03...: 229ms CPU time
Info::
Unattributable: 193ms CPU time
Info::
https://lucidmotors.com/: 178ms CPU time
Info::
https://cdn.optimizely.com/js/4942072910708736.js: 113ms CPU time
Warning::
Third-party scripts: 1170ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 21% Style & Layout 10% Parse HTML & CSS 9% Script Parsing & Compilation 8% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://lucidmotors.com/_next/static/chunks/18-734d931430e3e6ea.js338ms236ms3ms3rd
https://lucidmotors.com/_next/static/chunks/634-03fb50f8f72028d2.js229ms124ms37ms3rd
Unattributable193ms4ms0ms3rd
https://lucidmotors.com/178ms3ms4ms3rd
https://cdn.optimizely.com/js/4942072910708736.js113ms95ms10ms3rd
https://lucidmotors.com/_next/static/chunks/87c73c54-dd8d81ac9604067c.js62ms53ms3ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W9CKZJ&gtm_auth=OcDGx7g4rvpwfYGPDufp2A&gtm_preview=env-2&gtm_cookies_win=x57ms43ms14ms3rd
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+
Image Optimization
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (381 KB)
PASS
3 fonts (381 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

381 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 1.5 s LCP 2.0 shttps://lucidmotors.com/fonts/Sans/Lucid-Sans-VF.woff2Lucid-Sans-VF.woff2 https://lucidmotors.com/fonts/Sans/Lucid-Sans-VF.woff2 — 131.9 KiB — 0 ms — font-display: swaphttps://lucidmotors.com/fonts/Serif/Lucid-Serif-VF.woff2Lucid-Serif-VF.woff2 https://lucidmotors.com/fonts/Serif/Lucid-Serif-VF.woff2 — 120.0 KiB — 0 ms — font-display: swaphttps://lucidmotors.com/fonts/Serif-Italic/Lucid-Serif-Italic-VF.woff2Lucid-Serif-Italic-VF.w... https://lucidmotors.com/fonts/Serif-Italic/Lucid-Serif-Italic-VF.woff2 — 129.1 KiB — 0 ms — font-display: swap
Lucid-Sans-VF.woff2 woff2 swap
Size 132 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Lucid-Serif-VF.woff2 woff2 swap
Size 120 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Lucid-Serif-Italic-VF.w... woff2 swap
Size 129 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)

Fixing the unchecked items could save ~190 KB and ~380 ms

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
51 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 1170ms · 795KB · $22/mo
lucidmotors.com
Other
Costly
Execution 338ms
Transfer 42 KB
Monthly Cost $6/mo
lucidmotors.com
Other
Costly
Execution 229ms
Transfer 358 KB
Unused 36%
Monthly Cost $4/mo
Unattributable
Other
Optional
Execution 193ms
Transfer 0 KB
Monthly Cost $4/mo
lucidmotors.com
Other
Optional
Execution 178ms
Transfer 40 KB
Monthly Cost $3/mo
Optimizely
A/B Testing
Optional
Execution 113ms
Transfer 115 KB
Unused 48%
Monthly Cost $2/mo
lucidmotors.com
Other
Optional
Execution 62ms
Transfer 52 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 57ms
Transfer 188 KB
Unused 38%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • lucidmotors.com adds 338ms and costs ~$6/month
  • lucidmotors.com adds 229ms and costs ~$4/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

lucidmotors.com takes 338ms 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

lucidmotors.com takes 229ms 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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