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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
2
PASS
5
INFO
2

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

Mobile Desktop
60
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

445 ms

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

2.02 s

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

592 ms

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

0.043

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

2.76 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.

8.89 s

Page Load Progression

972 ms
1.9 s
2.9 s
3.9 s
4.9 s
5.8 s
6.8 s
7.8 s
Checks
14
5 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
7.4 MB transferred, 206 requests
FIX
7.4 MB transferred, 206 requests
Critical::
Page weighs 17.8 MB (7.4 MB transferred)
Warning::
JavaScript is 3.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.6 MB
Warning::
Images are 3.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.3 MB
Info::
Fonts are 278 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 278 KB
Warning::
206 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.5 g CO2 per page load
7.4 MB / 2.4 MB budget
7.4 MB transferred
206 requests
1.5 g CO2 per page load
JavaScript 3.6 MiB 49%
Images 3.3 MiB 45%
Fonts 278.3 KiB 4%
CSS 84.4 KiB 1%
HTML 64.9 KiB 1%
Other 13.8 KiB 0%
Other 6.2 KiB 0%
Other 2.1 KiB 0%
Other 880 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

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

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
76% third-party, 0 ms blocking
FIX
76% third-party, 0 ms blocking
Warning::
Third-party code accounts for 76% of page weight (5.6 MiB of 7.4 MiB)
Info::
Third-party blocking time is low (0 ms)
24%
76%
First-party Third-party
D
JS Execution Cost
Action
2960ms total JS execution
FIX
2960ms total JS execution
Warning::
https://widget.kapa.ai/kapa-widget.bundle.js: 427ms CPU time
Warning::
https://www.cockroachlabs.com/: 350ms CPU time
Warning::
Unattributable: 301ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 270ms CPU time
Warning::
https://www.cockroachlabs.com/_next/static/chunks/...: 252ms CPU time
Warning::
Third-party scripts: 2173ms (73% of total)

Main Thread Breakdown

Script Evaluation 65% Other 14% Script Parsing & Compilation 9% Style & Layout 6% Garbage Collection 4%
ScriptTotalScriptingParse/CompileParty
https://widget.kapa.ai/kapa-widget.bundle.js427ms351ms56ms3rd
https://www.cockroachlabs.com/350ms16ms8ms1st
Unattributable301ms26ms0ms3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js270ms232ms30ms3rd
https://www.cockroachlabs.com/_next/static/chunks/8069-b2b9ba81e4d52617.js252ms231ms3ms1st
https://www.datadoghq-browser-agent.com/datadog-rum-v3.js233ms116ms5ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NR8LC4204ms176ms19ms3rd
https://www.googletagmanager.com/gtag/js?id=G-913SQ8GKPR&cx=c&gtm=4e6460148ms127ms19ms3rd
https://go.cockroachlabs.com/js/forms2/js/forms2.min.js130ms98ms13ms3rd
https://js.stripe.com/v3103ms71ms28ms3rd

Showing top 10 of 17 scripts

F
JS Bundles
Action
71 scripts, 1.4 MB unused
FIX
71 scripts, 1.4 MB unused
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 179 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 179 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 179 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://widget.kapa.ai/kapa-widget.bundle.js: 179 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.stripe.com/v3: 148 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.4 MB
1475 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB179 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js0 KB179 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB179 KB (49%)✓3rd
https://widget.kapa.ai/kapa-widget.bundle.js569 KB179 KB (32%)✓3rd
https://js.stripe.com/v3225 KB148 KB (66%)✓3rd
https://www.cockroachlabs.com/_next/static/chunks/2053-7bbc002aee614434.js97 KB75 KB (78%)✓1st
https://www.cockroachlabs.com/_next/static/chunks/7894-065e7ecb97011df2.js112 KB74 KB (66%)✓1st
https://www.googletagmanager.com/gtag/destination?id=G-WPTKE58Z5D&cx=c&gtm=4e6460155 KB62 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-913SQ8GKPR&cx=c&gtm=4e6460174 KB62 KB (36%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NR8LC4182 KB58 KB (32%)✓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

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

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

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-cache—Cache but always revalidate first
no-store—Never cache this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
B
Image Optimization
43 images, 0 KB saveable
REVIEW
43 images, 0 KB saveable
Info::
All images are well-optimized
43 images 3.3 MB
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
8 fonts (278 KB)
PASS
8 fonts (278 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

278 KB total

Render-blocking

0

of 8

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 FCP 445 ms LCP 2.0 shttps://www.cockroachlabs.com/_next/static/media/poppins-semibold-webfont.7a6e4176.woff2poppins-semibold-webfon... https://www.cockroachlabs.com/_next/static/media/poppins-semibold-webfont.7a6e4176.woff2 — 16.3 KiB — 0 ms — font-display: swaphttps://www.cockroachlabs.com/_next/static/media/poppins-regular-webfont.aa7134f0.woff2poppins-regular-webfont... https://www.cockroachlabs.com/_next/static/media/poppins-regular-webfont.aa7134f0.woff2 — 16.3 KiB — 0 ms — font-display: swaphttps://www.cockroachlabs.com/_next/static/media/open-sans-light.3a7db618.ttfopen-sans-light.3a7db61... https://www.cockroachlabs.com/_next/static/media/open-sans-light.3a7db618.ttf — 72.4 KiB — 0 ms — font-display: swaphttps://www.cockroachlabs.com/_next/static/media/poppins-medium-webfont.ae432059.woff2poppins-medium-webfont.... https://www.cockroachlabs.com/_next/static/media/poppins-medium-webfont.ae432059.woff2 — 49.4 KiB — 0 ms — font-display: swaphttps://www.cockroachlabs.com/_next/static/media/open-sans-semibold.3e3373ee.ttfopen-sans-semibold.3e33... https://www.cockroachlabs.com/_next/static/media/open-sans-semibold.3e3373ee.ttf — 72.4 KiB — 0 ms — font-display: swaphttps://www.cockroachlabs.com/_next/static/media/slick.653a4cbb.woffslick.653a4cbb.woff https://www.cockroachlabs.com/_next/static/media/slick.653a4cbb.woff — 1.4 KiB — 0 ms — font-display: swaphttps://www.cockroachlabs.com/_next/static/media/poppins-bold-webfont.7e41b9e4.woff2poppins-bold-webfont.7e... https://www.cockroachlabs.com/_next/static/media/poppins-bold-webfont.7e41b9e4.woff2 — 16.1 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 0 ms — font-display: swap
poppins-semibold-webfon... woff2 swap
Size 16 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
poppins-regular-webfont... woff2 swap
Size 16 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
open-sans-light.3a7db61... ttf swap
Size 72 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
poppins-medium-webfont.... woff2 swap
Size 49 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
open-sans-semibold.3e33... ttf swap
Size 72 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
slick.653a4cbb.woff woff swap
Size 1 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
poppins-bold-webfont.7e... woff2 swap
Size 16 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 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 ~44 KB and ~88 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
Network Waterfall
206 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
73% of JavaScript execution is third-party
First-party Third-party 2173ms · 1488KB · €38/mo
widget.kapa.ai
Other
Costly
Execution 427ms
Transfer 569 KB
Unused 32%
Monthly Cost €7/mo
Unattributable
Other
Costly
Execution 301ms
Transfer 0 KB
Monthly Cost €5/mo
www.gstatic.com
Other
Costly
Execution 270ms
Transfer 0 KB
Unused 49%
Monthly Cost €5/mo
www.datadoghq-browser-agent.com
Other
Costly
Execution 233ms
Transfer 39 KB
Unused 58%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 204ms
Transfer 182 KB
Unused 32%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Optional
Execution 148ms
Transfer 174 KB
Unused 36%
Monthly Cost €3/mo
go.cockroachlabs.com
Other
Optional
Execution 130ms
Transfer 0 KB
Unused 54%
Monthly Cost €2/mo
Stripe
Payment
Essential
Execution 103ms
Transfer 225 KB
Unused 66%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 89ms
Transfer 155 KB
Unused 40%
Monthly Cost €2/mo
j.6sc.co
Other
Optional
Execution 81ms
Transfer 19 KB
Monthly Cost €1/mo
Facebook Pixel
Advertising
Optional
Execution 64ms
Transfer 95 KB
Unused 35%
Monthly Cost €1/mo
Microsoft Clarity
Session Replay
Optional
Execution 64ms
Transfer 26 KB
Monthly Cost €1/mo
boards.greenhouse.io
Other
Optional
Execution 60ms
Transfer 5 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • widget.kapa.ai adds 427ms and costs ~€7/month
  • Unattributable adds 301ms and costs ~€5/month
  • www.gstatic.com adds 270ms and costs ~€5/month
  • www.datadoghq-browser-agent.com adds 233ms and costs ~€4/month
  • Google Tag Manager adds 204ms and costs ~€4/month

73% 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

widget.kapa.ai takes 427ms 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 301ms 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.gstatic.com takes 270ms 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.datadoghq-browser-agent.com takes 233ms 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

58% of www.datadoghq-browser-agent.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

Google Tag Manager takes 204ms 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 go.cockroachlabs.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

66% of Stripe'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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