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https://www.djangoproject.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
93
GRADE
A
FIX
1
REVIEW
2
PASS
11
INFO
2

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

Mobile Desktop
88
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

3.03 s

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

3.05 s

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

0 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.

3.03 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.

3.05 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
11 PASS 2 REVIEW 1 FIX
D
Third-Party Impact
Action
98% third-party, 0 ms blocking
FIX
98% third-party, 0 ms blocking
Warning::
Third-party code accounts for 98% of page weight (309.2 KiB of 315.6 KiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
B
Image Optimization
5 images, 0 KB saveable
REVIEW
5 images, 0 KB saveable
Warning::
https://static.djangoproject.com/img/fundraising-h... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
5 images 7 KB
0 oversized -0 KB
5 legacy format
1 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
316 KB transferred, 16 requests
PASS
316 KB transferred, 16 requests
Info::
Page weighs 439 KB (316 KB transferred)
Info::
Fonts are 264 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 264 KB
Info::
16 HTTP requests
Info::
Estimated 0.06 g CO2 per page load
316 KB / 2.4 MB budget
316 KB transferred
16 requests
0.06 g CO2 per page load
Fonts 264.2 KiB 84%
CSS 26.3 KiB 8%
JavaScript 11.2 KiB 4%
Images 6.8 KiB 2%
HTML 6.3 KiB 2%
Other 703 B 0%
0 2.4 MB 4.9 MB
Under budget

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

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+
JS Execution Cost
434ms total JS execution
PASS
434ms total JS execution
Warning::
https://www.djangoproject.com/: 278ms CPU time
Info::
Unattributable: 155ms CPU time
Info::
Third-party scripts: 155ms (36% of total)

Main Thread Breakdown

Style & Layout 48% Other 34% Script Evaluation 9% Rendering 4% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.djangoproject.com/278ms6ms1ms1st
Unattributable155ms5ms0ms3rd
A+
Font Loading
4 fonts (264 KB)
PASS
4 fonts (264 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

264 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 3.0 s LCP 3.1 shttps://static.djangoproject.com/font/Roboto-Regular.62d315e68f04.woff2Roboto-Regular.62d315e6... https://static.djangoproject.com/font/Roboto-Regular.62d315e68f04.woff2 — 66.2 KiB — 0 ms — font-display: swaphttps://static.djangoproject.com/font/Roboto-Bold.b7e6688d781f.woff2Roboto-Bold.b7e6688d781... https://static.djangoproject.com/font/Roboto-Bold.b7e6688d781f.woff2 — 67.7 KiB — 0 ms — font-display: swaphttps://static.djangoproject.com/font/fontawesome-webfont.d95d6f5d5ab7.woff?v=4.2.0fontawesome-webfont.d95... https://static.djangoproject.com/font/fontawesome-webfont.d95d6f5d5ab7.woff?v=4.2.0 — 64.0 KiB — 0 ms — font-display: swaphttps://static.djangoproject.com/font/Roboto-Light.4b97d1da126a.woff2Roboto-Light.4b97d1da12... https://static.djangoproject.com/font/Roboto-Light.4b97d1da126a.woff2 — 66.1 KiB — 0 ms — font-display: swap
Roboto-Regular.62d315e6... woff2 swap
Size 66 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Bold.b7e6688d781... woff2 swap
Size 68 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.d95... woff swap
Size 64 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
Roboto-Light.4b97d1da12... woff2 swap
Size 66 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 ~19 KB and ~38 ms

A+
JS Bundles
4 scripts, 0 KB unused
PASS
4 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.djangoproject.com/js/mod/switch-dark-mode.139625c684db.js1 KB—✓3rd
https://static.djangoproject.com/js/lib/require.177879fbe7dd.js7 KB—✓3rd
https://static.djangoproject.com/js/djangoproject.6e389ef71ec2.js3 KB—✓3rd
https://static.djangoproject.com/js/main.8677b21133eb.js0 KB—✓3rd
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
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
A
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: max-age=300
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=300

DirectiveValueMeaning
max-age300Cache for 5 minutes
Effective TTL: 300 seconds
Network Waterfall
16 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
36% of JavaScript execution is third-party
First-party Third-party 155ms · 0KB · $2/mo
Unattributable
Other
Optional
Execution 155ms
Transfer 0 KB
Monthly Cost $2/mo

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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