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Performance

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

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

Mobile Desktop
78
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.

1.39 s

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

2.17 s

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

59 ms

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

0.001

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

3.29 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.

5.30 s

Page Load Progression

2.2 s
4.4 s
6.6 s
8.7 s
10.9 s
13.1 s
15.3 s
17.5 s
Checks
14
5 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
4.7 MB transferred, 160 requests
FIX
4.7 MB transferred, 160 requests
Critical::
Page weighs 9.4 MB (4.7 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
Warning::
Images are 1.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.3 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::
160 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.98 g CO2 per page load
4.7 MB / 2.4 MB budget
4.7 MB transferred
160 requests
0.98 g CO2 per page load
JavaScript 1.4 MiB 31%
Images 1.3 MiB 29%
Other 1.2 MiB 26%
Fonts 411.7 KiB 9%
CSS 178.2 KiB 4%
HTML 56.4 KiB 1%
Other 17.1 KiB 0%
Other 12.1 KiB 0%
Other 2.8 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

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
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (4.7 MiB of 4.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2172ms total JS execution
FIX
2172ms total JS execution
Warning::
https://www.redditstatic.com/ads/pixel.js: 1006ms CPU time
Warning::
Unattributable: 448ms CPU time
Info::
https://www.datadoghq.com/: 178ms CPU time
Info::
https://lp.datadoghq.com/js/forms2/js/forms2.min.j...: 129ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WDC...: 108ms CPU time
Warning::
Third-party scripts: 2172ms (100% of total)

Main Thread Breakdown

Script Evaluation 68% Other 17% Style & Layout 5% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.redditstatic.com/ads/pixel.js1006ms961ms2ms3rd
Unattributable448ms48ms0ms3rd
https://www.datadoghq.com/178ms28ms2ms3rd
https://lp.datadoghq.com/js/forms2/js/forms2.min.js129ms64ms15ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WDC8G6108ms92ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-KN80RDFSQK&cx=c&gtm=4e6461h2102ms78ms14ms3rd
https://www.datadoghq.com/static/dd-libs.cfc0fc7c8131c38b026e93f283148dccf754cd8d3e5ad027ef77c1b84c04d0a7265d7ca94b7475b930ba0e7e179b0ec3e1a73d10d09d79ca3cc6ed6971c09b95.js80ms43ms7ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-827913433&cx=c&gtm=4e6461h261ms46ms15ms3rd
https://www.datadoghq.com/assets/dd-browser-logs-rum.min.21306b867b795939bcec583e53f4a8111d44d48cf8e63d604dca79e5c2e51a18.js61ms55ms3ms3rd
D
JS Bundles
Action
48 scripts, 476 KB unused
FIX
48 scripts, 476 KB unused
Warning::
https://www.datadoghq.com/assets/search-bar.min.44...: 63 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...: 60 KB unused (41%)
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 KB63 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=4e6461h2174 KB62 KB (36%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-827913433&cx=c&gtm=4e6461h2146 KB60 KB (41%)✓3rd
https://transcend-cdn.com/cm/dc241cd4-6477-4f2b-86c0-6bcb51869e28/ui.js99 KB38 KB (38%)✓3rd
https://cdn.calibermind.com/a.js59 KB36 KB (62%)✓3rd
https://lp.datadoghq.com/js/forms2/js/forms2.min.js0 KB36 KB (53%)✓3rd
https://lp.datadoghq.com/js/forms2/js/forms2.min.js68 KB36 KB (53%)✓3rd
https://connect.facebook.net/en_US/fbevents.js95 KB32 KB (34%)✓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::
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/dd_logo_n_70x75.pn... 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 1.3 MB
0 oversized -0 KB
21 legacy format
4 missing dimensions CLS risk

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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.4 s LCP 2.2 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 73 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
160 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 2172ms · 684KB · $7/mo
www.redditstatic.com
Other
Costly
Execution 1006ms
Transfer 19 KB
Monthly Cost $3/mo
Unattributable
Other
Costly
Execution 448ms
Transfer 0 KB
Monthly Cost $1/mo
www.datadoghq.com
Other
Optional
Execution 178ms
Transfer 53 KB
Monthly Cost $1/mo
lp.datadoghq.com
Other
Optional
Execution 129ms
Transfer 0 KB
Unused 53%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 108ms
Transfer 185 KB
Unused 34%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 102ms
Transfer 174 KB
Unused 36%
Monthly Cost $0/mo
www.datadoghq.com
Other
Optional
Execution 80ms
Transfer 78 KB
Unused 39%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 61ms
Transfer 146 KB
Unused 41%
Monthly Cost $0/mo
www.datadoghq.com
Other
Optional
Execution 61ms
Transfer 30 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • www.redditstatic.com adds 1006ms and costs ~$3/month
  • Unattributable adds 448ms 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 1006ms 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 448ms 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

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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