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https://www.coinbase.com

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
45
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.

4.28 s

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

7.88 s

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

842 ms

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

0.023

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

4.52 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.

11.32 s

Page Load Progression

598 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.8 s
Checks
16
8 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
3.9 MB transferred, 135 requests
FIX
3.9 MB transferred, 135 requests
Warning::
Page weighs 6.9 MB (3.9 MB transferred)
Warning::
JavaScript is 961 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 961 KB
Info::
Fonts are 459 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 459 KB
Warning::
135 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.81 g CO2 per page load
3.9 MB / 2.4 MB budget
3.9 MB transferred
135 requests
0.81 g CO2 per page load
Other 2.1 MiB 55%
JavaScript 961.3 KiB 24%
Fonts 459.5 KiB 12%
Images 239.5 KiB 6%
HTML 58.9 KiB 1%
CSS 29.7 KiB 1%
Other 20.5 KiB 1%
Other 5.5 KiB 0%
Other 2.6 KiB 0%
Other 1.5 KiB 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

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

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
64% third-party, 0 ms blocking
FIX
64% third-party, 0 ms blocking
Warning::
Third-party code accounts for 64% of page weight (2.5 MiB of 3.9 MiB)
Info::
Third-party blocking time is low (0 ms)
36%
64%
First-party Third-party
F
JS Execution Cost
Action
6255ms total JS execution
FIX
6255ms total JS execution
Warning::
https://www.coinbase.com/assets/sw-cache/e_CPeMmKQ...: 3496ms CPU time
Warning::
https://www.coinbase.com/en-es: 1393ms CPU time
Warning::
Unattributable: 964ms CPU time
Warning::
https://www.coinbase.com/assets/sw-cache/c_SDqiHuC...: 351ms CPU time
Info::
https://accounts.google.com/gsi/client: 52ms CPU time
Info::
Third-party scripts: 1015ms (16% of total)

Main Thread Breakdown

Script Evaluation 51% Other 24% Style & Layout 17% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://www.coinbase.com/assets/sw-cache/e_CPeMmKQD.js3496ms2747ms10ms1st
https://www.coinbase.com/en-es1393ms6ms1ms1st
Unattributable964ms57ms0ms3rd
https://www.coinbase.com/assets/sw-cache/c_SDqiHuCG.js351ms326ms0ms1st
https://accounts.google.com/gsi/client52ms24ms27ms3rd
D
JS Bundles
Action
79 scripts, 366 KB unused
FIX
79 scripts, 366 KB unused
Warning::
https://www.coinbase.com/assets/sw-cache/e_CPeMmKQ...: 213 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 70 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.coinbase.com/assets/sw-cache/c_Cpj0G-N...: 60 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.coinbase.com/assets/sw-cache/c_CI3cnUD...: 24 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 366 KB
366 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.coinbase.com/assets/sw-cache/e_CPeMmKQD.js556 KB213 KB (38%)✓1st
https://accounts.google.com/gsi/client93 KB70 KB (75%)✓3rd
https://www.coinbase.com/assets/sw-cache/c_Cpj0G-NY.js68 KB60 KB (89%)✓1st
https://www.coinbase.com/assets/sw-cache/c_CI3cnUDh.js42 KB24 KB (58%)✓1st
https://www.coinbase.com/assets/sw-cache/c_SDqiHuCG.js12 KB—✓1st
https://www.coinbase.com/assets/sw-cache/c_BUJ-iIkL.js2 KB—✓1st
https://www.coinbase.com/assets/sw-cache/c_B6Pw_4Fk.js11 KB—✓1st
https://www.coinbase.com/assets/sw-cache/c_CG1oB3en.js1 KB—✓1st
https://www.coinbase.com/assets/sw-cache/c_CamGwVL_.js4 KB—✓1st
https://www.coinbase.com/assets/sw-cache/c_BvoB-3h9.js6 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

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, no-cache, must-revalidate, max-age=0,no-store, no-cache, must-revalidate, proxy-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, no-cache, must-revalidate, max-age=0,no-store, no-cache, must-revalidate, proxy-revalidate

DirectiveValueMeaning
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
max-age0Cache for 0 seconds
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
proxy-revalidate—
B
Image Optimization
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Info::
All images are well-optimized
15 images 240 KB
0 oversized -0 KB
11 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
6 fonts (459 KB)
PASS
6 fonts (459 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

459 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 4.3 s LCP 7.9 shttps://www.coinbase.com/assets/sw-cache/a_CH-aRrrD.woff2a_CH-aRrrD.woff2 https://www.coinbase.com/assets/sw-cache/a_CH-aRrrD.woff2 — 39.8 KiB — 0 ms — font-display: swaphttps://www.coinbase.com/assets/sw-cache/a_UN23PxTD.woff2a_UN23PxTD.woff2 https://www.coinbase.com/assets/sw-cache/a_UN23PxTD.woff2 — 259.4 KiB — 0 ms — font-display: swaphttps://www.coinbase.com/assets/sw-cache/a_BDyAm2xz.woff2a_BDyAm2xz.woff2 https://www.coinbase.com/assets/sw-cache/a_BDyAm2xz.woff2 — 40.3 KiB — 0 ms — font-display: swaphttps://www.coinbase.com/assets/sw-cache/a_BJ1-X6Dz.woff2a_BJ1-X6Dz.woff2 https://www.coinbase.com/assets/sw-cache/a_BJ1-X6Dz.woff2 — 38.7 KiB — 0 ms — font-display: swaphttps://www.coinbase.com/assets/sw-cache/a_BybxolpF.woff2a_BybxolpF.woff2 https://www.coinbase.com/assets/sw-cache/a_BybxolpF.woff2 — 40.3 KiB — 0 ms — font-display: swaphttps://www.coinbase.com/assets/sw-cache/a_B-911Gqf.woff2a_B-911Gqf.woff2 https://www.coinbase.com/assets/sw-cache/a_B-911Gqf.woff2 — 41.0 KiB — 0 ms — font-display: swap
a_CH-aRrrD.woff2 woff2 swap
Size 40 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
a_UN23PxTD.woff2 woff2 swap
Size 259 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
a_BDyAm2xz.woff2 woff2 swap
Size 40 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
a_BJ1-X6Dz.woff2 woff2 swap
Size 39 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
a_BybxolpF.woff2 woff2 swap
Size 40 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
a_B-911Gqf.woff2 woff2 swap
Size 41 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)

Fixing the unchecked items could save ~130 KB and ~260 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
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: Cloudflare

Network Waterfall
135 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
16% of JavaScript execution is third-party
First-party Third-party 1015ms · 93KB · $13/mo
Unattributable
Other
Costly
Execution 964ms
Transfer 0 KB
Monthly Cost $13/mo
accounts.google.com
Other
Optional
Execution 52ms
Transfer 93 KB
Unused 75%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 964ms and costs ~$13/month

Unattributable takes 964ms 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

75% 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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