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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
35
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
98
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.
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.

9.28 s

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

24.26 s

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

954 ms

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.

10.16 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.

24.63 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
16
7 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 162 requests
FIX
3.0 MB transferred, 162 requests
Warning::
Page weighs 7.7 MB (3.0 MB transferred)
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Info::
Fonts are 412 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 412 KB
Warning::
162 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.62 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
162 requests
0.62 g CO2 per page load
JavaScript 1.4 MiB 48%
Images 907.0 KiB 30%
Fonts 411.7 KiB 14%
CSS 178.1 KiB 6%
HTML 57.2 KiB 2%
Other 16.8 KiB 1%
Other 12.5 KiB 0%
Other 2.3 KiB 0%
Other 994 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

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
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
8967ms total JS execution
FIX
8967ms total JS execution
Warning::
https://www.redditstatic.com/ads/pixel.js: 3892ms CPU time
Warning::
Unattributable: 1317ms CPU time
Warning::
https://lp.datadoghq.com/js/forms2/js/forms2.min.j...: 615ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WDC...: 433ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-KN80...: 397ms CPU time
Warning::
Third-party scripts: 8967ms (100% of total)

Main Thread Breakdown

Script Evaluation 72% Other 14% Style & Layout 5% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.redditstatic.com/ads/pixel.js3892ms3695ms8ms3rd
Unattributable1317ms174ms0ms3rd
https://lp.datadoghq.com/js/forms2/js/forms2.min.js615ms267ms31ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WDC8G6433ms352ms49ms3rd
https://www.googletagmanager.com/gtag/js?id=G-KN80RDFSQK&cx=c&gtm=4e6460397ms341ms47ms3rd
https://www.datadoghq.com/356ms92ms6ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-827913433&cx=c&gtm=4e6460223ms191ms31ms3rd
https://www.datadoghq.com/assets/dd-browser-logs-rum.min.21306b867b795939bcec583e53f4a8111d44d48cf8e63d604dca79e5c2e51a18.js213ms191ms7ms3rd
https://www.datadoghq.com/static/dd-libs.cfc0fc7c8131c38b026e93f283148dccf754cd8d3e5ad027ef77c1b84c04d0a7265d7ca94b7475b930ba0e7e179b0ec3e1a73d10d09d79ca3cc6ed6971c09b95.js210ms129ms16ms3rd
https://nexus.ensighten.com/choozle/17899/Bootstrap.js196ms136ms3ms3rd

Showing top 10 of 21 scripts

D
JS Bundles
Action
51 scripts, 476 KB unused
FIX
51 scripts, 476 KB unused
Warning::
https://www.datadoghq.com/assets/search-bar.min.44...: 64 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WDC...: 62 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-KN80...: 62 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-827...: 61 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://transcend-cdn.com/cm/dc241cd4-6477-4f2b-86...: 38 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 476 KB
476 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.datadoghq.com/assets/search-bar.min.44a96559baa6da2809e90007237d78800433875436c3883a7a2723435910748f.js97 KB64 KB (66%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WDC8G6185 KB62 KB (34%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-KN80RDFSQK&cx=c&gtm=4e6460174 KB62 KB (36%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-827913433&cx=c&gtm=4e6460146 KB61 KB (42%)✓3rd
https://transcend-cdn.com/cm/dc241cd4-6477-4f2b-86c0-6bcb51869e28/ui.js98 KB38 KB (38%)✓3rd
https://cdn.calibermind.com/a.js59 KB36 KB (62%)✓3rd
https://lp.datadoghq.com/js/forms2/js/forms2.min.js0 KB35 KB (53%)✓3rd
https://lp.datadoghq.com/js/forms2/js/forms2.min.js67 KB35 KB (53%)✓3rd
https://connect.facebook.net/en_US/fbevents.js95 KB32 KB (33%)✓3rd
https://www.datadoghq.com/static/dd-libs.cfc0fc7c8131c38b026e93f283148dccf754cd8d3e5ad027ef77c1b84c04d0a7265d7ca94b7475b930ba0e7e179b0ec3e1a73d10d09d79ca3cc6ed6971c09b95.js78 KB30 KB (39%)✓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
Image Optimization
Action
42 images, 0 KB saveable
REVIEW
42 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://imgix.datadoghq.com/img/home-hostmap-stati... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://imgix.datadoghq.com/img/home/careers_deskt... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://imgix.datadoghq.com/img/blog/state-of-devs... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://imgix.datadoghq.com/img/icons/privacyoptio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
42 images 907 KB
0 oversized -0 KB
18 legacy format
5 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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
6 fonts (412 KB)
PASS
6 fonts (412 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

412 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 22.0 s 24.0 s FCP 9.3 s LCP 24.3 shttps://www.datadoghq.com/fonts/web-fonts/NationalWeb-Light.woff2NationalWeb-Light.woff2 https://www.datadoghq.com/fonts/web-fonts/NationalWeb-Light.woff2 — 72.5 KiB — 0 ms — font-display: swaphttps://www.datadoghq.com/fonts/web-fonts/NationalWeb-Semibold.woff2NationalWeb-Semibold.woff2 https://www.datadoghq.com/fonts/web-fonts/NationalWeb-Semibold.woff2 — 72.9 KiB — 0 ms — font-display: swaphttps://www.datadoghq.com/fonts/web-fonts/NationalWeb-Bold.woff2NationalWeb-Bold.woff2 https://www.datadoghq.com/fonts/web-fonts/NationalWeb-Bold.woff2 — 74.4 KiB — 0 ms — font-display: swaphttps://www.datadoghq.com/fonts/web-fonts/NationalWeb-Book.woff2NationalWeb-Book.woff2 https://www.datadoghq.com/fonts/web-fonts/NationalWeb-Book.woff2 — 65.7 KiB — 0 ms — font-display: swaphttps://www.datadoghq.com/fonts/iconfont.woff2?11122a160a6ede4e25b35a906dfe790ciconfont.woff2 https://www.datadoghq.com/fonts/iconfont.woff2?11122a160a6ede4e25b35a906dfe790c — 64.3 KiB — 0 ms — font-display: swaphttps://www.datadoghq.com/fonts/web-fonts/NationalWeb-BookItalic.woff2NationalWeb-BookItalic.... https://www.datadoghq.com/fonts/web-fonts/NationalWeb-BookItalic.woff2 — 61.9 KiB — 0 ms — font-display: swap
NationalWeb-Light.woff2 woff2 swap
Size 72 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
NationalWeb-Semibold.woff2 woff2 swap
Size 73 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
NationalWeb-Bold.woff2 woff2 swap
Size 74 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
NationalWeb-Book.woff2 woff2 swap
Size 66 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
iconfont.woff2 woff2 swap
Size 64 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
NationalWeb-BookItalic.... woff2 swap
Size 62 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
8 hints, 0 missing preconnects
PASS
8 hints, 0 missing preconnects
Info::
Page uses 8 resource hint(s)

Current Resource Hints

preconnect
—
preload
8
dns-prefetch
—
prefetch
—

8 resource hints configured

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
162 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 8967ms · 1243KB · $29/mo
www.redditstatic.com
Other
Costly
Execution 3892ms
Transfer 19 KB
Monthly Cost $12/mo
Unattributable
Other
Costly
Execution 1317ms
Transfer 0 KB
Monthly Cost $4/mo
lp.datadoghq.com
Other
Costly
Execution 615ms
Transfer 0 KB
Unused 53%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Costly
Execution 433ms
Transfer 185 KB
Unused 34%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Costly
Execution 397ms
Transfer 174 KB
Unused 36%
Monthly Cost $1/mo
www.datadoghq.com
Other
Costly
Execution 356ms
Transfer 53 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Costly
Execution 223ms
Transfer 146 KB
Unused 42%
Monthly Cost $1/mo
www.datadoghq.com
Other
Costly
Execution 213ms
Transfer 30 KB
Monthly Cost $1/mo
www.datadoghq.com
Other
Costly
Execution 210ms
Transfer 78 KB
Unused 39%
Monthly Cost $1/mo
nexus.ensighten.com
Other
Optional
Execution 196ms
Transfer 10 KB
Monthly Cost $1/mo
www.datadoghq.com
Other
Optional
Execution 179ms
Transfer 97 KB
Unused 66%
Monthly Cost $1/mo
transcend-cdn.com
Other
Optional
Execution 171ms
Transfer 98 KB
Unused 38%
Monthly Cost $1/mo
cdn.calibermind.com
Other
Optional
Execution 120ms
Transfer 59 KB
Unused 62%
Monthly Cost $0/mo
transcend-cdn.com
Other
Optional
Execution 107ms
Transfer 55 KB
Monthly Cost $0/mo
Facebook Pixel
Advertising
Optional
Execution 107ms
Transfer 95 KB
Unused 33%
Monthly Cost $0/mo
Facebook Pixel
Advertising
Optional
Execution 105ms
Transfer 40 KB
Monthly Cost $0/mo
d-code.liadm.com
Other
Optional
Execution 83ms
Transfer 46 KB
Unused 46%
Monthly Cost $0/mo
www.datadoghq.com
Other
Optional
Execution 72ms
Transfer 17 KB
Monthly Cost $0/mo
munchkin.marketo.net
Other
Optional
Execution 62ms
Transfer 5 KB
Monthly Cost $0/mo
tag.demandbase.com
Other
Optional
Execution 58ms
Transfer 18 KB
Monthly Cost $0/mo
LinkedIn Insight
Advertising
Optional
Execution 50ms
Transfer 19 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • www.redditstatic.com adds 3892ms and costs ~$12/month
  • Unattributable adds 1317ms and costs ~$4/month
  • lp.datadoghq.com adds 615ms and costs ~$2/month
  • Google Tag Manager adds 433ms and costs ~$1/month
  • Google Tag Manager adds 397ms and costs ~$1/month
  • www.datadoghq.com adds 356ms and costs ~$1/month
  • Google Tag Manager adds 223ms and costs ~$1/month
  • www.datadoghq.com adds 213ms and costs ~$1/month
  • www.datadoghq.com adds 210ms and costs ~$1/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.redditstatic.com takes 3892ms 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 1317ms 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

lp.datadoghq.com takes 615ms 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

53% of lp.datadoghq.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 433ms 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

Google Tag Manager takes 397ms 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.com takes 356ms 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

Google Tag Manager takes 223ms 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.com takes 213ms 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.com takes 210ms 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

66% of www.datadoghq.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

62% of cdn.calibermind.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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