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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
6
REVIEW
1
PASS
8
INFO
2

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

28
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
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.
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.

9.63 s

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

15.87 s

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

2.41 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.

9.63 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.

16.20 s

Page Load Progression

436 ms
871 ms
1.3 s
1.7 s
2.2 s
2.6 s
3.0 s
3.5 s
Checks
17
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
2.8 MB transferred, 106 requests
FIX
2.8 MB transferred, 106 requests
Warning::
Page weighs 7.8 MB (2.8 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::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Warning::
106 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.59 g CO2 per page load
2.8 MB / 2.4 MB budget
2.8 MB transferred
106 requests
0.59 g CO2 per page load
JavaScript 1.3 MiB 47%
Images 1.2 MiB 43%
HTML 128.6 KiB 4%
Fonts 117.1 KiB 4%
Other 46.6 KiB 2%
Other 4.2 KiB 0%
Other 1.1 KiB 0%
Other 615 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

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
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.8 MiB of 2.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
12555ms total JS execution
FIX
12555ms total JS execution
Warning::
https://www.uber.com/_static/client-vendor-61e4c4f...: 8913ms CPU time
Warning::
https://www.uber.com/: 1262ms CPU time
Warning::
Unattributable: 1157ms CPU time
Warning::
https://www.uber.com/_static/client-main-892d89862...: 992ms CPU time
Info::
https://tags.tiqcdn.com/utag/uber/main/prod/utag.j...: 168ms CPU time
Warning::
Third-party scripts: 12555ms (100% of total)

Main Thread Breakdown

Script Evaluation 73% Other 12% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://www.uber.com/_static/client-vendor-61e4c4f1e391a01d.js8913ms8111ms5ms3rd
https://www.uber.com/1262ms57ms17ms3rd
Unattributable1157ms37ms0ms3rd
https://www.uber.com/_static/client-main-892d89862f7981e6.js992ms864ms7ms3rd
https://tags.tiqcdn.com/utag/uber/main/prod/utag.js168ms140ms25ms3rd
https://accounts.google.com/gsi/client62ms30ms31ms3rd
F
JS Bundles
Action
42 scripts, 752 KB unused
FIX
42 scripts, 752 KB unused
Warning::
https://www.uber.com/_static/client-main-892d89862...: 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: 81 KB unused (85%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uber.com/_static/client-vendor-61e4c4f...: 78 KB unused (45%)
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: 752 KB
752 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.uber.com/_static/client-main-892d89862f7981e6.js390 KB234 KB (60%)✓3rd
https://www.uber.com/_static/client-8708-353544d5ef8de5b9.js280 KB219 KB (78%)✓3rd
https://accounts.google.com/gsi/client96 KB81 KB (85%)✓3rd
https://www.uber.com/_static/client-vendor-61e4c4f1e391a01d.js175 KB78 KB (45%)✓3rd
https://www.uber.com/_static/client-450-bfe15bf1cd6fa2b9.js95 KB51 KB (54%)✓3rd
https://www.uber.com/_static/client-5122-56789282ad38667f.js36 KB25 KB (70%)✓3rd
https://www.uber.com/_static/client-6557-6931926b27570e0d.js43 KB23 KB (54%)✓3rd
https://www.uber.com/_static/client-3265-c7e3496f50449268.js30 KB21 KB (70%)✓3rd
https://tags.tiqcdn.com/utag/uber/main/prod/utag.js36 KB20 KB (56%)✓3rd
https://www.uber.com/_static/client-9405-3618dd210052180d.js3 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
Page Weight Inventory
Action
106 resources · 2.8 MB · 752 KB savings available
FIX
106 resources · 2.8 MB · 752 KB savings available
Warning::
Page weight 1.8 MB over 1MB target
Got: 2.8 MB Expected: ≤ 1 MB
Info::
~752 KB of savings available
Warning::
105 third-party resources (100% of weight)
Info::
3 resources over 200KB
106 resources · 2.8 MiB · 105 third-party 1.8 MiB over 1MB target
JavaScript 47% · 1.3 MiB
Image 43% · 1.2 MiB
Document 4% · 128.9 KiB
Font 4% · 117.1 KiB
Other 2% · 51.9 KiB

~751.7 KiB of savings available

Remove unused JavaScript: 751.7 KiB
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
Image Optimization
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Info::
All images are well-optimized
27 images 1.2 MB
0 oversized -0 KB
22 legacy format
0 missing dimensions CLS risk
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 9.6 s LCP 15.9 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 — 60 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 — 29.3 KiB — 51 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 — 66 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 — 28.4 KiB — 48 ms — font-display: swap
UberMove-Regular.woff2 woff2 swap
Size 30 KB
Load time 60 ms
Start 484 ms
Risk FOUT — text flashes from fallback to web font
UberMoveText-Medium.woff2 woff2 swap
Size 29 KB
Load time 51 ms
Start 486 ms
Risk FOUT — text flashes from fallback to web font
UberMove-Bold.woff2 woff2 swap
Size 30 KB
Load time 66 ms
Start 486 ms
Risk FOUT — text flashes from fallback to web font
UberMoveText-Regular.woff2 woff2 swap
Size 28 KB
Load time 48 ms
Start 486 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
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

Network Waterfall
106 requests over 5978ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 9.6 s LCP 15.9 shttps://uber.com// https://uber.com/ — 301 — 312 B — 53 ms — h2https://www.uber.com/www.uber.com/ https://www.uber.com/ — 200 — 128.6 KiB — 175 ms — h2https://tags.tiqcdn.com/utag/uber/main/prod/utag.jstags.tiqcdn.com/utag/uber/main/prod... https://tags.tiqcdn.com/utag/uber/main/prod/utag.js — 200 — 36.3 KiB — 18 ms — h2https://www.uber.com/bootstrap.json?referrer=&_bmd=2026-04-16T17%3A55%3A26.525Z_0b383b51-540d-48ff-9936-b39c68b2238dwww.uber.com/bootstrap.json?referre... https://www.uber.com/bootstrap.json?referrer=&_bmd=2026-04-16T17%3A55%3A26.525Z_0b383b51-540d-48ff-9936-b39c68b2238d — 200 — 1.8 KiB — 198 ms — h2https://www.uber.com/api/getCurrentUser?localeCode=enwww.uber.com/api/getCurrentUser?loc... https://www.uber.com/api/getCurrentUser?localeCode=en — 200 — 239 B — 59 ms — h2https://www.uber.com/api/getExperiments?localeCode=enwww.uber.com/api/getExperiments?loc... https://www.uber.com/api/getExperiments?localeCode=en — 200 — 253 B — 186 ms — h2https://www.uber.com/api/getMapHeroEnabledProducts?localeCode=enwww.uber.com/api/getMapHeroEnabledP... https://www.uber.com/api/getMapHeroEnabledProducts?localeCode=en — 200 — 275 B — 195 ms — h2https://www.uber.com/api/getProductSuggestions?localeCode=enwww.uber.com/api/getProductSuggesti... https://www.uber.com/api/getProductSuggestions?localeCode=en — 200 — 857 B — 192 ms — h2https://www.uber.com/api/getProductSuggestions?localeCode=enwww.uber.com/api/getProductSuggesti... https://www.uber.com/api/getProductSuggestions?localeCode=en — 200 — 789 B — 194 ms — h2https://www.uber.com/_static/client-main-892d89862f7981e6.jswww.uber.com/_static/client-main-89... https://www.uber.com/_static/client-main-892d89862f7981e6.js — 200 — 389.9 KiB — 166 ms — h2https://www.uber.com/_static/client-vendor-61e4c4f1e391a01d.jswww.uber.com/_static/client-vendor-... https://www.uber.com/_static/client-vendor-61e4c4f1e391a01d.js — 200 — 174.9 KiB — 128 ms — h2https://www.uber.com/_static/client-2611-cea8fd9da8c4aa5f.jswww.uber.com/_static/client-2611-ce... https://www.uber.com/_static/client-2611-cea8fd9da8c4aa5f.js — 200 — 1008 B — 65 ms — h2https://www.uber.com/_static/client-450-bfe15bf1cd6fa2b9.jswww.uber.com/_static/client-450-bfe... https://www.uber.com/_static/client-450-bfe15bf1cd6fa2b9.js — 200 — 94.7 KiB — 78 ms — h2https://www.uber.com/_static/client-5646-1e02200604102a9c.jswww.uber.com/_static/client-5646-1e... https://www.uber.com/_static/client-5646-1e02200604102a9c.js — 200 — 2.7 KiB — 51 ms — h2https://www.uber.com/_static/client-380-01c47a7ed61e48bb.jswww.uber.com/_static/client-380-01c... https://www.uber.com/_static/client-380-01c47a7ed61e48bb.js — 200 — 17.8 KiB — 47 ms — h2https://www.uber.com/_static/client-4498-f530650f5e4edfb3.jswww.uber.com/_static/client-4498-f5... https://www.uber.com/_static/client-4498-f530650f5e4edfb3.js — 200 — 4.3 KiB — 66 ms — h2https://www.uber.com/_static/client-7012-7ef2edff816f9813.jswww.uber.com/_static/client-7012-7e... https://www.uber.com/_static/client-7012-7ef2edff816f9813.js — 200 — 6.0 KiB — 126 ms — h2https://www.uber.com/_static/client-8760-2088e005f836ce44.jswww.uber.com/_static/client-8760-20... https://www.uber.com/_static/client-8760-2088e005f836ce44.js — 200 — 1.9 KiB — 67 ms — h2https://www.uber.com/_static/client-2404-de0f9162860a66e7.jswww.uber.com/_static/client-2404-de... https://www.uber.com/_static/client-2404-de0f9162860a66e7.js — 200 — 10.6 KiB — 72 ms — h2https://www.uber.com/_static/client-3265-c7e3496f50449268.jswww.uber.com/_static/client-3265-c7... https://www.uber.com/_static/client-3265-c7e3496f50449268.js — 200 — 29.9 KiB — 86 ms — h2https://www.uber.com/_static/client-4312-36afdf6fb5b158eb.jswww.uber.com/_static/client-4312-36... https://www.uber.com/_static/client-4312-36afdf6fb5b158eb.js — 200 — 2.7 KiB — 120 ms — h2https://www.uber.com/_static/client-5122-56789282ad38667f.jswww.uber.com/_static/client-5122-56... https://www.uber.com/_static/client-5122-56789282ad38667f.js — 200 — 36.0 KiB — 102 ms — h2https://www.uber.com/_static/client-6189-d911f066ba8f7785.jswww.uber.com/_static/client-6189-d9... https://www.uber.com/_static/client-6189-d911f066ba8f7785.js — 200 — 4.6 KiB — 119 ms — h2https://www.uber.com/_static/client-6557-6931926b27570e0d.jswww.uber.com/_static/client-6557-69... https://www.uber.com/_static/client-6557-6931926b27570e0d.js — 200 — 43.1 KiB — 106 ms — h2https://www.uber.com/_static/client-6766-77c883e6a8d9617e.jswww.uber.com/_static/client-6766-77... https://www.uber.com/_static/client-6766-77c883e6a8d9617e.js — 200 — 4.0 KiB — 80 ms — h2https://www.uber.com/_static/client-7951-631b13a970483b0a.jswww.uber.com/_static/client-7951-63... https://www.uber.com/_static/client-7951-631b13a970483b0a.js — 200 — 5.3 KiB — 118 ms — h2https://www.uber.com/_static/client-7968-dd35b79dd65c1a3b.jswww.uber.com/_static/client-7968-dd... https://www.uber.com/_static/client-7968-dd35b79dd65c1a3b.js — 200 — 3.4 KiB — 150 ms — h2https://www.uber.com/_static/client-8708-353544d5ef8de5b9.jswww.uber.com/_static/client-8708-35... https://www.uber.com/_static/client-8708-353544d5ef8de5b9.js — 200 — 280.0 KiB — 181 ms — h2https://www.uber.com/_static/client-9405-3618dd210052180d.jswww.uber.com/_static/client-9405-36... https://www.uber.com/_static/client-9405-3618dd210052180d.js — 200 — 3.4 KiB — 144 ms — h2https://www.uber.com/_static/client-3271-b10ae485732e961c.jswww.uber.com/_static/client-3271-b1... https://www.uber.com/_static/client-3271-b10ae485732e961c.js — 200 — 2.0 KiB — 144 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 9.6 s LCP 15.9 shttps://uber.com// https://uber.com/ — 301 — 312 B — 53 ms — h2https://www.uber.com/www.uber.com/ https://www.uber.com/ — 200 — 128.6 KiB — 175 ms — h2https://tags.tiqcdn.com/utag/uber/main/prod/utag.jstags.tiqcdn.com/utag/uber/main/prod... https://tags.tiqcdn.com/utag/uber/main/prod/utag.js — 200 — 36.3 KiB — 18 ms — h2https://www.uber.com/bootstrap.json?referrer=&_bmd=2026-04-16T17%3A55%3A26.525Z_0b383b51-540d-48ff-9936-b39c68b2238dwww.uber.com/bootstrap.json?referre... https://www.uber.com/bootstrap.json?referrer=&_bmd=2026-04-16T17%3A55%3A26.525Z_0b383b51-540d-48ff-9936-b39c68b2238d — 200 — 1.8 KiB — 198 ms — h2https://www.uber.com/api/getCurrentUser?localeCode=enwww.uber.com/api/getCurrentUser?loc... https://www.uber.com/api/getCurrentUser?localeCode=en — 200 — 239 B — 59 ms — h2https://www.uber.com/api/getExperiments?localeCode=enwww.uber.com/api/getExperiments?loc... https://www.uber.com/api/getExperiments?localeCode=en — 200 — 253 B — 186 ms — h2https://www.uber.com/api/getMapHeroEnabledProducts?localeCode=enwww.uber.com/api/getMapHeroEnabledP... https://www.uber.com/api/getMapHeroEnabledProducts?localeCode=en — 200 — 275 B — 195 ms — h2https://www.uber.com/api/getProductSuggestions?localeCode=enwww.uber.com/api/getProductSuggesti... https://www.uber.com/api/getProductSuggestions?localeCode=en — 200 — 857 B — 192 ms — h2https://www.uber.com/api/getProductSuggestions?localeCode=enwww.uber.com/api/getProductSuggesti... https://www.uber.com/api/getProductSuggestions?localeCode=en — 200 — 789 B — 194 ms — h2https://www.uber.com/_static/client-main-892d89862f7981e6.jswww.uber.com/_static/client-main-89... https://www.uber.com/_static/client-main-892d89862f7981e6.js — 200 — 389.9 KiB — 166 ms — h2https://www.uber.com/_static/client-vendor-61e4c4f1e391a01d.jswww.uber.com/_static/client-vendor-... 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h3https://tb-static.uber.com/prod/udam-assets/b3d58f99-f7f6-4bab-8d37-4736846ecd98.svgtb-static.uber.com/prod/udam-assets... https://tb-static.uber.com/prod/udam-assets/b3d58f99-f7f6-4bab-8d37-4736846ecd98.svg — 200 — 307 B — 11 ms — h3https://www.uber.com/_eventswww.uber.com/_events https://www.uber.com/_events — 200 — 132 B — 66 ms — h2https://www.uber.com/api/pudoLocationSearch?localeCode=enwww.uber.com/api/pudoLocationSearch... https://www.uber.com/api/pudoLocationSearch?localeCode=en — 200 — 794 B — 197 ms — h2https://www.uber.com/api/pudoLocationSearch?localeCode=enwww.uber.com/api/pudoLocationSearch... https://www.uber.com/api/pudoLocationSearch?localeCode=en — 200 — 902 B — 984 ms — h2https://www.uber.com/_eventswww.uber.com/_events https://www.uber.com/_events — 200 — 195 B — 1.2 s — h2https://www.uber.com/_eventswww.uber.com/_events https://www.uber.com/_events — 200 — 132 B — 43 ms — h2https://www.uber.com/_eventswww.uber.com/_events https://www.uber.com/_events — 200 — 156 B — 40 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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 12555ms · 826KB · $167/mo
www.uber.com
Other
Costly
Execution 8913ms
Transfer 175 KB
Unused 45%
Monthly Cost $118/mo
www.uber.com
Other
Costly
Execution 1262ms
Transfer 129 KB
Monthly Cost $17/mo
Unattributable
Other
Costly
Execution 1157ms
Transfer 0 KB
Monthly Cost $15/mo
www.uber.com
Other
Costly
Execution 992ms
Transfer 390 KB
Unused 60%
Monthly Cost $13/mo
tags.tiqcdn.com
Other
Optional
Execution 168ms
Transfer 36 KB
Unused 56%
Monthly Cost $2/mo
accounts.google.com
Other
Optional
Execution 62ms
Transfer 96 KB
Unused 85%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.uber.com adds 8913ms and costs ~$118/month
  • www.uber.com adds 1262ms and costs ~$17/month
  • Unattributable adds 1157ms and costs ~$15/month
  • www.uber.com adds 992ms and costs ~$13/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

www.uber.com takes 8913ms 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

www.uber.com takes 1262ms 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 1157ms 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

www.uber.com takes 992ms 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 www.uber.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

56% of tags.tiqcdn.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

85% of accounts.google.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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