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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
3
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
80
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

1.40 s

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

2.72 s

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

80 ms

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

0.005

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

1.40 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.

4.77 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
14
5 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
8.8 MB transferred, 91 requests
FIX
8.8 MB transferred, 91 requests
Critical::
Page weighs 13.1 MB (8.8 MB transferred)
Warning::
Images are 4.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.0 MB
Warning::
JavaScript is 2.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.0 MB
Info::
Fonts are 392 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 392 KB
Info::
91 HTTP requests
Info::
Estimated 1.8 g CO2 per page load
8.8 MB / 2.4 MB budget
8.8 MB transferred
91 requests
1.8 g CO2 per page load
Images 4.0 MiB 46%
JavaScript 2.0 MiB 23%
Other 1.8 MiB 21%
HTML 496.6 KiB 6%
Fonts 392.2 KiB 4%
CSS 32.4 KiB 0%
Other 5.3 KiB 0%
Other 1.6 KiB 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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 (8.8 MiB of 8.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
35 scripts, 1.4 MB unused
FIX
35 scripts, 1.4 MB unused
Warning::
https://www.getdbt.com/_next/static/chunks/7641-73...: 450 KB unused (98%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.getdbt.com/_next/static/chunks/9677-c6...: 413 KB unused (94%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.getdbt.com/_next/static/chunks/620-507...: 106 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KKF...: 80 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.getdbt.com/_next/static/chunks/47bf8ba...: 68 KB unused (87%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.4 MB
1384 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.getdbt.com/_next/static/chunks/7641-73639cef0cc45242.js459 KB450 KB (98%)✓3rd
https://www.getdbt.com/_next/static/chunks/9677-c65d0244bac40aaa.js438 KB413 KB (94%)✓3rd
https://www.getdbt.com/_next/static/chunks/620-507cb01e9b3ab03b.js192 KB106 KB (55%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KKF5R7X164 KB80 KB (49%)✓3rd
https://www.getdbt.com/_next/static/chunks/47bf8baf-e20b49444a715f32.js78 KB68 KB (87%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-328058248&cx=c&gtm=4e6460144 KB57 KB (40%)✓3rd
https://www.getdbt.com/_next/static/chunks/456-e07cad14c828e7df.js61 KB52 KB (86%)✓3rd
https://cdn.optimizely.com/js/5579855295676416.js90 KB47 KB (52%)✓3rd
https://www.getdbt.com/_next/static/chunks/9933-0d316493926abc4a.js48 KB42 KB (87%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓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
Image Optimization
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Info::
All images are well-optimized
22 images 4.0 MB
0 oversized -0 KB
11 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1551ms total JS execution
REVIEW
1551ms total JS execution
Warning::
https://www.getdbt.com/: 645ms CPU time
Info::
Unattributable: 233ms CPU time
Info::
https://www.getdbt.com/_next/static/chunks/18-734d...: 174ms CPU time
Info::
https://www.getdbt.com/_next/static/chunks/9677-c6...: 144ms CPU time
Info::
https://ob.greencolumnhealth.com/i/b1abb5fabf95cc1...: 140ms CPU time
Warning::
Third-party scripts: 1551ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Other 28% Style & Layout 17% Script Parsing & Compilation 9% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://www.getdbt.com/645ms7ms25ms3rd
Unattributable233ms19ms0ms3rd
https://www.getdbt.com/_next/static/chunks/18-734d931430e3e6ea.js174ms157ms5ms3rd
https://www.getdbt.com/_next/static/chunks/9677-c65d0244bac40aaa.js144ms128ms16ms3rd
https://ob.greencolumnhealth.com/i/b1abb5fabf95cc12245be3eb1a870015.js140ms93ms3ms3rd
https://cdn.optimizely.com/js/5579855295676416.js77ms67ms6ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-328058248&cx=c&gtm=4e646071ms54ms16ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KKF5R7X66ms46ms17ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
7 fonts (392 KB)
PASS
7 fonts (392 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

392 KB total

Render-blocking

0

of 7

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 2.5 s FCP 1.4 s LCP 2.7 shttps://use.typekit.net/af/95ce8a/000000000000000077588a3d/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3l https://use.typekit.net/af/95ce8a/000000000000000077588a3d/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3 — 63.2 KiB — 0 ms — font-display: swaphttps://use.typekit.net/af/ac73e9/000000000000000077588a48/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3l https://use.typekit.net/af/ac73e9/000000000000000077588a48/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3 — 67.3 KiB — 0 ms — font-display: swaphttps://use.typekit.net/af/e32df6/000000000000000077588a4e/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/e32df6/000000000000000077588a4e/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 63.0 KiB — 0 ms — font-display: swaphttps://use.typekit.net/af/c77c44/00000000000000007735944d/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/c77c44/00000000000000007735944d/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 18.5 KiB — 0 ms — font-display: swaphttps://use.typekit.net/af/dd126b/00000000000000007755bcc6/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/dd126b/00000000000000007755bcc6/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 63.5 KiB — 0 ms — font-display: swaphttps://use.typekit.net/af/d86b45/0000000000000000775828cf/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/d86b45/0000000000000000775828cf/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 66.7 KiB — 0 ms — font-display: swaphttps://www.getdbt.com/_next/static/media/938eaa8f547a81be-s.p.woff2938eaa8f547a81be-s.p.woff2 https://www.getdbt.com/_next/static/media/938eaa8f547a81be-s.p.woff2 — 50.2 KiB — 0 ms — font-display: swap
l woff2 swap
Size 63 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 67 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 63 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 63 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 67 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
938eaa8f547a81be-s.p.woff2 woff2 swap
Size 50 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
Network Waterfall
91 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 1551ms · 1421KB · €27/mo
www.getdbt.com
Other
Costly
Execution 645ms
Transfer 494 KB
Monthly Cost €11/mo
Unattributable
Other
Costly
Execution 233ms
Transfer 0 KB
Monthly Cost €4/mo
www.getdbt.com
Other
Optional
Execution 174ms
Transfer 46 KB
Monthly Cost €3/mo
www.getdbt.com
Other
Optional
Execution 144ms
Transfer 438 KB
Unused 94%
Monthly Cost €2/mo
ob.greencolumnhealth.com
Other
Optional
Execution 140ms
Transfer 45 KB
Monthly Cost €2/mo
Optimizely
A/B Testing
Optional
Execution 77ms
Transfer 90 KB
Unused 52%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 144 KB
Unused 40%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 66ms
Transfer 164 KB
Unused 49%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.getdbt.com adds 645ms and costs ~€11/month
  • Unattributable adds 233ms 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

www.getdbt.com takes 645ms 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 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

94% of www.getdbt.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

52% of Optimizely'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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