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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
30
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
79
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
75
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.

3.21 s

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

20.42 s

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

4.46 s

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

0.002

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

11.08 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.

29.98 s

Page Load Progression

995 ms
2.0 s
3.0 s
4.0 s
5.0 s
6.0 s
7.0 s
8.0 s
Checks
16
8 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
13.2 MB transferred, 144 requests
FIX
13.2 MB transferred, 144 requests
Critical::
Page weighs 20.6 MB (13.2 MB transferred)
Warning::
JavaScript is 3.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.1 MB
Warning::
144 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.8 g CO2 per page load
13.2 MB / 2.4 MB budget
13.2 MB transferred
144 requests
2.8 g CO2 per page load
Other 8.4 MiB 63%
JavaScript 3.1 MiB 24%
Images 718.0 KiB 5%
Other 406.0 KiB 3%
HTML 349.1 KiB 3%
Fonts 187.6 KiB 1%
CSS 108.8 KiB 1%
Other 20.9 KiB 0%
Other 7.4 KiB 0%
Other 327 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

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
76% third-party, 0 ms blocking
FIX
76% third-party, 0 ms blocking
Warning::
Third-party code accounts for 76% of page weight (10.1 MiB of 13.2 MiB)
Info::
Third-party blocking time is low (0 ms)
24%
76%
First-party Third-party
F
JS Execution Cost
Action
16724ms total JS execution
FIX
16724ms total JS execution
Warning::
https://cua-help-me-charge-ui.tesla.com/charging-m...: 4531ms CPU time
Warning::
https://www.tesla.com/: 2460ms CPU time
Warning::
Unattributable: 1228ms CPU time
Warning::
https://www.tesla.com/VyIxAvoRX/iT/z6D1Ypw/Qmr5JwS...: 1141ms CPU time
Warning::
https://www.tesla.com/_flysystem/s3/js/js_wPIJyP4b...: 1136ms CPU time
Info::
Third-party scripts: 8265ms (49% of total)

Main Thread Breakdown

Script Evaluation 61% Style & Layout 15% Other 12% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://cua-help-me-charge-ui.tesla.com/charging-map/charging-map-DR8fdE3w.js4531ms4285ms1ms3rd
https://www.tesla.com/2460ms12ms14ms1st
Unattributable1228ms276ms0ms3rd
https://www.tesla.com/VyIxAvoRX/iT/z6D1Ypw/Qmr5JwS9/PlRjdnQ/TE4ofl/pFGwFu?v=f3089d3f-ca50-7029-43cc-3a9938be02111141ms972ms45ms1st
https://www.tesla.com/_flysystem/s3/js/js_wPIJyP4bm3RMopeEZRmZCteTA_OhbwuKvmqcPnLLdCI.js1136ms347ms485ms1st
https://www.tesla.com/VyIxAvoRX/iT/z6D1Ypw/afr5JwS91Jb5rQ/HxNednQ/Hy8rfj/goDngB846ms730ms97ms1st
https://www.tesla.com/_flysystem/s3/js/js_Jn-fFtlQnABG5gJ90DCKcJgdUfZs7ffU6ZG8VwjhJKc.js822ms649ms1ms1st
https://www.tesla.com/_flysystem/s3/js/js_lgAUF73EwPZckdVetLd3hyJnuiTfS29L8jj_UyRK5Q4.js815ms531ms13ms1st
https://maps.googleapis.com/maps-api-v3/api/js/63/14d/util.js785ms552ms24ms3rd
https://maps.googleapis.com/maps-api-v3/api/js/63/14d/map.js527ms328ms7ms3rd

Showing top 10 of 20 scripts

F
JS Bundles
Action
27 scripts, 835 KB unused
FIX
27 scripts, 835 KB unused
Warning::
https://cua-chat-ui.tesla.com/assets/www_orca_avay...: 254 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.tesla.com/_flysystem/s3/js/js_KoDDy_wx...: 166 KB unused (30%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.tesla.com/_flysystem/s3/js/js_wPIJyP4b...: 135 KB unused (11%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://maps.googleapis.com/maps/api/js?client=gme...: 83 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.tesla.com/VyIxAvoRX/iT/z6D1Ypw/afr5JwS...: 38 KB unused (22%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 835 KB
835 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cua-chat-ui.tesla.com/assets/www_orca_avaya-CyQF1ULT.js397 KB254 KB (65%)✓3rd
https://www.tesla.com/_flysystem/s3/js/js_KoDDy_wxLdN4gE_TuIsv5xM3rGklD15HSAu_tvi9fjo.js560 KB166 KB (30%)✓1st
https://www.tesla.com/_flysystem/s3/js/js_wPIJyP4bm3RMopeEZRmZCteTA_OhbwuKvmqcPnLLdCI.js1235 KB135 KB (11%)✓1st
https://maps.googleapis.com/maps/api/js?client=gme-teslamotorsinc&language=en-US&libraries=places&region=US&v=3.55173 KB83 KB (48%)✓3rd
https://www.tesla.com/VyIxAvoRX/iT/z6D1Ypw/afr5JwS91Jb5rQ/HxNednQ/Hy8rfj/goDngB176 KB38 KB (22%)✓1st
https://www.tesla.com/_flysystem/s3/js/js_V1jVDsHcMIHYfWteQMBLNX0tzLs3sMW8dcwIb9BQQEc.js62 KB34 KB (54%)✓1st
https://www.tesla.com/VyIxAvoRX/iT/z6D1Ypw/Qmr5JwS9/PlRjdnQ/TE4ofl/pFGwFu?v=f3089d3f-ca50-7029-43cc-3a9938be0211160 KB31 KB (20%)✓1st
https://www.tesla.com/_flysystem/s3/js/js_1-9vQRpdDrFXUeDIMIfORd4gEjkiHTuFRfD_qcGzADQ.js88 KB27 KB (31%)✓1st
https://cua-help-me-charge-ui.tesla.com/charging-map/charging-map-DR8fdE3w.js71 KB24 KB (34%)✓3rd
https://maps.googleapis.com/maps-api-v3/api/js/63/14d/util.js71 KB22 KB (31%)✓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
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
51 images, 0 KB saveable
PASS
51 images, 0 KB saveable
Info::
All images are well-optimized
51 images 718 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
6 fonts (188 KB)
PASS
6 fonts (188 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

188 KB total

Render-blocking

0

of 6

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 18.0 s 20.0 s FCP 3.2 s LCP 20.4 shttps://digitalassets.tesla.com/tesla-design-system/raw/upload/static/fonts/universal-sans-2/web/text/Universal-Sans-Text-Regular.woff2Universal-Sans-Text-Reg... https://digitalassets.tesla.com/tesla-design-system/raw/upload/static/fonts/universal-sans-2/web/text/Universal-Sans-Text-Regular.woff2 — 37.7 KiB — 0 ms — font-display: swaphttps://digitalassets.tesla.com/tesla-design-system/raw/upload/static/fonts/universal-sans-2/web/display/Universal-Sans-Display-Medium.woff2Universal-Sans-Display-... https://digitalassets.tesla.com/tesla-design-system/raw/upload/static/fonts/universal-sans-2/web/display/Universal-Sans-Display-Medium.woff2 — 37.3 KiB — 0 ms — font-display: swaphttps://digitalassets.tesla.com/tesla-design-system/raw/upload/static/fonts/universal-sans-2/web/text/Universal-Sans-Text-Medium.woff2Universal-Sans-Text-Med... https://digitalassets.tesla.com/tesla-design-system/raw/upload/static/fonts/universal-sans-2/web/text/Universal-Sans-Text-Medium.woff2 — 38.2 KiB — 0 ms — font-display: swaphttps://digitalassets.tesla.com/tesla-design-system/raw/upload/static/fonts/universal-sans-2/web/display/Universal-Sans-Display-Regular.woff2Universal-Sans-Display-... https://digitalassets.tesla.com/tesla-design-system/raw/upload/static/fonts/universal-sans-2/web/display/Universal-Sans-Display-Regular.woff2 — 37.7 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 0 ms — font-display: swap
Universal-Sans-Text-Reg... woff2 swap
Size 38 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Universal-Sans-Display-... woff2 swap
Size 37 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Universal-Sans-Text-Med... woff2 swap
Size 38 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Universal-Sans-Display-... woff2 swap
Size 38 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 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
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
Network Waterfall
144 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
49% of JavaScript execution is third-party
First-party Third-party 8265ms · 820KB · $110/mo
cua-help-me-charge-ui.tesla.com
Other
Costly
Execution 4531ms
Transfer 71 KB
Unused 34%
Monthly Cost $60/mo
Unattributable
Other
Costly
Execution 1228ms
Transfer 0 KB
Monthly Cost $16/mo
maps.googleapis.com
Other
Costly
Execution 785ms
Transfer 71 KB
Unused 31%
Monthly Cost $10/mo
maps.googleapis.com
Other
Costly
Execution 527ms
Transfer 25 KB
Monthly Cost $7/mo
maps.googleapis.com
Other
Costly
Execution 460ms
Transfer 26 KB
Monthly Cost $6/mo
cua-chat-ui.tesla.com
Other
Costly
Execution 336ms
Transfer 397 KB
Unused 65%
Monthly Cost $4/mo
maps.googleapis.com
Other
Optional
Execution 181ms
Transfer 173 KB
Unused 48%
Monthly Cost $2/mo
maps.googleapis.com
Other
Optional
Execution 95ms
Transfer 10 KB
Monthly Cost $1/mo
maps.googleapis.com
Other
Optional
Execution 67ms
Transfer 10 KB
Monthly Cost $1/mo
maps.googleapis.com
Other
Optional
Execution 54ms
Transfer 37 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • cua-help-me-charge-ui.tesla.com adds 4531ms and costs ~$60/month
  • Unattributable adds 1228ms and costs ~$16/month
  • maps.googleapis.com adds 785ms and costs ~$10/month
  • maps.googleapis.com adds 527ms and costs ~$7/month
  • maps.googleapis.com adds 460ms and costs ~$6/month
  • cua-chat-ui.tesla.com adds 336ms and costs ~$4/month

49% 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

cua-help-me-charge-ui.tesla.com takes 4531ms 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 1228ms 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

maps.googleapis.com takes 785ms 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

maps.googleapis.com takes 527ms 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

maps.googleapis.com takes 460ms 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

cua-chat-ui.tesla.com takes 336ms 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

65% of cua-chat-ui.tesla.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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