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https://www.1password.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
3
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
29
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

10.00 s

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

21.40 s

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

1.74 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.

10.00 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.

21.53 s

Page Load Progression

388 ms
776 ms
1.2 s
1.6 s
1.9 s
2.3 s
2.7 s
3.1 s
Checks
14
6 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 132 requests
FIX
3.0 MB transferred, 132 requests
Warning::
Page weighs 10.7 MB (3.0 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
Info::
CSS is 373 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 373 KB
Warning::
132 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.63 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
132 requests
0.63 g CO2 per page load
JavaScript 1.3 MiB 42%
Other 919.9 KiB 30%
CSS 373.3 KiB 12%
Images 244.5 KiB 8%
HTML 168.8 KiB 5%
Fonts 57.1 KiB 2%
Other 13.5 KiB 0%
Other 2.3 KiB 0%
Other 238 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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 (3.0 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
9273ms total JS execution
FIX
9273ms total JS execution
Warning::
Unattributable: 2393ms CPU time
Warning::
https://1password.com/_next/static/chunks/framewor...: 2187ms CPU time
Warning::
https://1password.com/: 1494ms CPU time
Warning::
https://1password.com/_next/static/chunks/pages/%5...: 446ms CPU time
Warning::
https://1password.com/_next/static/chunks/bc1a11eb...: 429ms CPU time
Warning::
Third-party scripts: 9273ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 28% Script Parsing & Compilation 5% Style & Layout 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable2393ms908ms0ms3rd
https://1password.com/_next/static/chunks/framework-b9fd9bcc3ecde907.js?dpl=dpl_3ETtrf6YZYuQAaGKzJ8t6s2P3Pmd2187ms1844ms25ms3rd
https://1password.com/1494ms2ms0ms3rd
https://1password.com/_next/static/chunks/pages/%5B%5B...slug%5D%5D-e8c27fe4287662cf.js?dpl=dpl_3ETtrf6YZYuQAaGKzJ8t6s2P3Pmd446ms444ms1ms3rd
https://1password.com/_next/static/chunks/bc1a11eb-39d6b105a12c9d8e.js?dpl=dpl_3ETtrf6YZYuQAaGKzJ8t6s2P3Pmd429ms406ms22ms3rd
https://1password.com/_next/static/chunks/3171-baaca19acadc507b.js?dpl=dpl_3ETtrf6YZYuQAaGKzJ8t6s2P3Pmd329ms188ms25ms3rd
https://1password.com/_next/static/css/776567fbd6210af8.css?dpl=dpl_3ETtrf6YZYuQAaGKzJ8t6s2P3Pmd306ms0ms0ms3rd
https://transcend-cdn.com/cm/fa619274-3c15-4155-bbec-c0cb75733259/ui.js292ms235ms53ms3rd
https://1password.com/6si.min.js283ms258ms5ms3rd
https://1password.com/_next/static/chunks/pages/_app-b5117911cac3e570.js?dpl=dpl_3ETtrf6YZYuQAaGKzJ8t6s2P3Pmd257ms175ms81ms3rd

Showing top 10 of 17 scripts

B
Image Optimization
42 images, 0 KB saveable
REVIEW
42 images, 0 KB saveable
Info::
All images are well-optimized
42 images 244 KB
0 oversized -0 KB
31 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
44 scripts, 285 KB unused
REVIEW
44 scripts, 285 KB unused
Warning::
https://1password.com/_next/static/chunks/1380-23d...: 64 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://1password.com/_next/static/chunks/pages/_a...: 44 KB unused (33%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://transcend-cdn.com/cm/fa619274-3c15-4155-bb...: 38 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://1password.com/_next/static/chunks/3171-baa...: 33 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://1password.com/_next/static/chunks/6563-54a...: 31 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 285 KB
285 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://1password.com/_next/static/chunks/1380-23d45b7c0830f5df.js?dpl=dpl_3ETtrf6YZYuQAaGKzJ8t6s2P3Pmd137 KB64 KB (48%)✓3rd
https://1password.com/_next/static/chunks/pages/_app-b5117911cac3e570.js?dpl=dpl_3ETtrf6YZYuQAaGKzJ8t6s2P3Pmd137 KB44 KB (33%)✓3rd
https://transcend-cdn.com/cm/fa619274-3c15-4155-bbec-c0cb75733259/ui.js99 KB38 KB (38%)✓3rd
https://1password.com/_next/static/chunks/3171-baaca19acadc507b.js?dpl=dpl_3ETtrf6YZYuQAaGKzJ8t6s2P3Pmd63 KB33 KB (54%)✓3rd
https://1password.com/_next/static/chunks/6563-54aa583b2aa4597d.js?dpl=dpl_3ETtrf6YZYuQAaGKzJ8t6s2P3Pmd50 KB31 KB (65%)✓3rd
https://1password.com/_next/static/chunks/4064-c74433f99dc46b66.js?dpl=dpl_3ETtrf6YZYuQAaGKzJ8t6s2P3Pmd63 KB30 KB (50%)✓3rd
https://1password.com/_next/static/chunks/3447-687e2c50eea3ba65.js?dpl=dpl_3ETtrf6YZYuQAaGKzJ8t6s2P3Pmd66 KB26 KB (41%)✓3rd
https://transcend-cdn.com/cm/fa619274-3c15-4155-bbec-c0cb75733259/airgap.js53 KB20 KB (39%)✓3rd
https://1password.com/_next/static/chunks/6246.25d99a1e87dc3e57.js?dpl=dpl_3ETtrf6YZYuQAaGKzJ8t6s2P3Pmd5 KB—✓3rd
https://1password.com/_next/static/chunks/6307.0ea24fcfa26fdf0c.js?dpl=dpl_3ETtrf6YZYuQAaGKzJ8t6s2P3Pmd4 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

B
HTTP Caching
public, max-age=0, must-revalidate
REVIEW
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
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
2 fonts (57 KB)
PASS
2 fonts (57 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

57 KB total

Render-blocking

0

of 2

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 22.0 s FCP 10.0 s LCP 21.4 shttps://1password.com/_next/static/media/9e5180a7add93a09-s.p.woff29e5180a7add93a09-s.p.woff2 https://1password.com/_next/static/media/9e5180a7add93a09-s.p.woff2 — 29.6 KiB — 0 ms — font-display: swaphttps://1password.com/_next/static/media/bee40e69b0eb6902-s.p.woff2bee40e69b0eb6902-s.p.woff2 https://1password.com/_next/static/media/bee40e69b0eb6902-s.p.woff2 — 27.4 KiB — 0 ms — font-display: swap
9e5180a7add93a09-s.p.woff2 woff2 swap
Size 30 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
bee40e69b0eb6902-s.p.woff2 woff2 swap
Size 27 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
14 hints, 0 missing preconnects
PASS
14 hints, 0 missing preconnects
Info::
Page uses 14 resource hint(s)

Current Resource Hints

preconnect
—
preload
+4
14
dns-prefetch
—
prefetch
—

14 resource hints configured

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
132 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 9273ms · 1339KB · €148/mo
Unattributable
Other
Costly
Execution 2393ms
Transfer 0 KB
Monthly Cost €38/mo
1password.com
Other
Costly
Execution 2187ms
Transfer 48 KB
Monthly Cost €35/mo
1password.com
Other
Costly
Execution 1494ms
Transfer 165 KB
Monthly Cost €24/mo
1password.com
Other
Costly
Execution 446ms
Transfer 4 KB
Monthly Cost €7/mo
1password.com
Other
Costly
Execution 429ms
Transfer 42 KB
Monthly Cost €7/mo
1password.com
Other
Costly
Execution 329ms
Transfer 63 KB
Unused 54%
Monthly Cost €5/mo
1password.com
Other
Costly
Execution 306ms
Transfer 366 KB
Monthly Cost €5/mo
transcend-cdn.com
Other
Costly
Execution 292ms
Transfer 99 KB
Unused 38%
Monthly Cost €5/mo
1password.com
Other
Costly
Execution 283ms
Transfer 14 KB
Monthly Cost €5/mo
1password.com
Other
Costly
Execution 257ms
Transfer 137 KB
Unused 33%
Monthly Cost €4/mo
1password.com
Other
Costly
Execution 256ms
Transfer 42 KB
Monthly Cost €4/mo
1password.com
Other
Optional
Execution 179ms
Transfer 64 KB
Monthly Cost €3/mo
transcend-cdn.com
Other
Optional
Execution 145ms
Transfer 53 KB
Unused 39%
Monthly Cost €2/mo
1password.com
Other
Optional
Execution 95ms
Transfer 25 KB
Monthly Cost €2/mo
1password.com
Other
Optional
Execution 65ms
Transfer 66 KB
Unused 41%
Monthly Cost €1/mo
1password.com
Other
Optional
Execution 63ms
Transfer 137 KB
Unused 48%
Monthly Cost €1/mo
1password.com
Other
Optional
Execution 52ms
Transfer 15 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 2393ms and costs ~€38/month
  • 1password.com adds 2187ms and costs ~€35/month
  • 1password.com adds 1494ms and costs ~€24/month
  • 1password.com adds 446ms and costs ~€7/month
  • 1password.com adds 429ms and costs ~€7/month
  • 1password.com adds 329ms and costs ~€5/month
  • 1password.com adds 306ms and costs ~€5/month
  • transcend-cdn.com adds 292ms and costs ~€5/month
  • 1password.com adds 283ms and costs ~€5/month
  • 1password.com adds 257ms and costs ~€4/month
  • 1password.com adds 256ms 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

Unattributable takes 2393ms 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

1password.com takes 2187ms 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

1password.com takes 1494ms 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

1password.com takes 446ms 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

1password.com takes 429ms 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

1password.com takes 329ms 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

54% of 1password.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

1password.com takes 306ms 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

transcend-cdn.com takes 292ms 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

1password.com takes 283ms 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

1password.com takes 257ms 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

1password.com takes 256ms 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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