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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
58
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

1.41 s

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

2.70 s

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

416 ms

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

0.069

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

2.11 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.

2.83 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
14
5 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 106 requests
FIX
2.4 MB transferred, 106 requests
Info::
Page weighs 7.3 MB (2.4 MB transferred)
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Warning::
106 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.50 g CO2 per page load
2.4 MB / 2.4 MB budget
2.4 MB transferred
106 requests
0.50 g CO2 per page load
JavaScript 1.3 MiB 56%
Images 776.7 KiB 32%
HTML 125.0 KiB 5%
Fonts 117.1 KiB 5%
Other 45.7 KiB 2%
Other 3.8 KiB 0%
Other 3.0 KiB 0%
Other 915 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

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
JS Execution Cost
Action
2602ms total JS execution
FIX
2602ms total JS execution
Warning::
https://www.uber.com/_static/client-vendor-61e4c4f...: 1863ms CPU time
Warning::
https://www.uber.com/fr/en/: 294ms CPU time
Warning::
Unattributable: 264ms CPU time
Info::
https://www.uber.com/_static/client-main-af165af41...: 180ms CPU time
Info::
Third-party scripts: 264ms (10% of total)

Main Thread Breakdown

Script Evaluation 70% Other 16% Style & Layout 6% Garbage Collection 3% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.uber.com/_static/client-vendor-61e4c4f1e391a01d.js1863ms1679ms1ms1st
https://www.uber.com/fr/en/294ms9ms2ms1st
Unattributable264ms4ms0ms3rd
https://www.uber.com/_static/client-main-af165af41dd15219.js180ms166ms1ms1st
F
JS Bundles
Action
42 scripts, 750 KB unused
FIX
42 scripts, 750 KB unused
Warning::
https://www.uber.com/_static/client-main-af165af41...: 234 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uber.com/_static/client-8708-353544d5e...: 219 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 78 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uber.com/_static/client-vendor-61e4c4f...: 78 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uber.com/_static/client-450-bfe15bf1cd...: 51 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 750 KB
750 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.uber.com/_static/client-main-af165af41dd15219.js388 KB234 KB (60%)✓1st
https://www.uber.com/_static/client-8708-353544d5ef8de5b9.js280 KB219 KB (78%)✓1st
https://accounts.google.com/gsi/client94 KB78 KB (84%)✓3rd
https://www.uber.com/_static/client-vendor-61e4c4f1e391a01d.js175 KB78 KB (44%)✓1st
https://www.uber.com/_static/client-450-bfe15bf1cd6fa2b9.js95 KB51 KB (54%)✓1st
https://www.uber.com/_static/client-5122-56789282ad38667f.js36 KB25 KB (70%)✓1st
https://www.uber.com/_static/client-6557-009cc196b55e3405.js43 KB23 KB (54%)✓1st
https://www.uber.com/_static/client-3265-65fce3dcb4176869.js30 KB21 KB (70%)✓1st
https://tags.tiqcdn.com/utag/uber/main/prod/utag.js36 KB20 KB (57%)✓3rd
https://www.uber.com/_static/client-9405-3618dd210052180d.js3 KB—✓1st

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

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store, max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, max-age=0

DirectiveValueMeaning
no-store—Never cache this response
max-age0Cache for 0 seconds
B
Third-Party Impact
42% third-party, 0 ms blocking
REVIEW
42% third-party, 0 ms blocking
Info::
Third-party code accounts for 42% of page weight (1023.8 KiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
58%
42%
First-party Third-party
B
Image Optimization
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
Info::
All images are well-optimized
29 images 777 KB
0 oversized -0 KB
26 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
4 fonts (117 KB)
PASS
4 fonts (117 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

117 KB total

Render-blocking

0

of 4

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 2.5 s FCP 1.4 s LCP 2.7 shttps://tb-static.uber.com/prod/uber-static/UberMove-Regular.woff2UberMove-Regular.woff2 https://tb-static.uber.com/prod/uber-static/UberMove-Regular.woff2 — 29.6 KiB — 0 ms — font-display: swaphttps://tb-static.uber.com/prod/uber-static/UberMoveText-Medium.woff2UberMoveText-Medium.woff2 https://tb-static.uber.com/prod/uber-static/UberMoveText-Medium.woff2 — 29.5 KiB — 0 ms — font-display: swaphttps://tb-static.uber.com/prod/uber-static/UberMove-Bold.woff2UberMove-Bold.woff2 https://tb-static.uber.com/prod/uber-static/UberMove-Bold.woff2 — 29.8 KiB — 0 ms — font-display: swaphttps://tb-static.uber.com/prod/uber-static/UberMoveText-Regular.woff2UberMoveText-Regular.woff2 https://tb-static.uber.com/prod/uber-static/UberMoveText-Regular.woff2 — 28.2 KiB — 0 ms — font-display: swap
UberMove-Regular.woff2 woff2 swap
Size 30 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
UberMoveText-Medium.woff2 woff2 swap
Size 30 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
UberMove-Bold.woff2 woff2 swap
Size 30 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
UberMoveText-Regular.woff2 woff2 swap
Size 28 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
106 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
10% of JavaScript execution is third-party
First-party Third-party 264ms · 0KB · $4/mo
Unattributable
Other
Costly
Execution 264ms
Transfer 0 KB
Monthly Cost $4/mo

These scripts may cost more than they're worth

  • Unattributable adds 264ms and costs ~$4/month

Unattributable takes 264ms 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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