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https://www.midjourney.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
1
PASS
7
INFO
2

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

Mobile Desktop
48
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
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.

1.72 s

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

1.72 s

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

14.01 s

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.

4.38 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.

48.08 s

Page Load Progression

4.6 s
9.1 s
13.7 s
18.3 s
22.8 s
27.4 s
32.0 s
36.5 s
Checks
14
7 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
14.6 MB transferred, 45 requests
FIX
14.6 MB transferred, 45 requests
Critical::
Page weighs 18.3 MB (14.6 MB transferred)
Warning::
Images are 13.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 13.0 MB
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::
45 HTTP requests
Info::
Estimated 3.1 g CO2 per page load
14.6 MB / 2.4 MB budget
14.6 MB transferred
45 requests
3.1 g CO2 per page load
Images 13.0 MiB 89%
JavaScript 1.4 MiB 10%
Fonts 81.9 KiB 1%
CSS 45.2 KiB 0%
HTML 7.4 KiB 0%
Other 5.6 KiB 0%
Other 1.7 KiB 0%
Other 1.0 KiB 0%
Other 763 B 0%
Other 0 B 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

F
JS Execution Cost
Action
44494ms total JS execution
FIX
44494ms total JS execution
Warning::
https://www.midjourney.com/public/out/clientSideEn...: 43326ms CPU time
Warning::
Unattributable: 739ms CPU time
Info::
https://www.midjourney.com/: 248ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=AW-165...: 101ms CPU time
Info::
https://www.midjourney.com/cdn-cgi/challenge-platf...: 80ms CPU time
Info::
Third-party scripts: 840ms (2% of total)

Main Thread Breakdown

Other 78% Script Evaluation 21%
ScriptTotalScriptingParse/CompileParty
https://www.midjourney.com/public/out/clientSideEntry-fawaqcm4.js43326ms9231ms5ms1st
Unattributable739ms39ms0ms3rd
https://www.midjourney.com/248ms34ms1ms1st
https://www.googletagmanager.com/gtag/js?id=AW-16508112792101ms86ms14ms3rd
https://www.midjourney.com/cdn-cgi/challenge-platform/scripts/jsd/main.js80ms77ms1ms1st
F
JS Bundles
Action
6 scripts, 917 KB unused
FIX
6 scripts, 917 KB unused
Warning::
https://www.midjourney.com/public/out/clientSideEn...: 868 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-165...: 50 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 917 KB
917 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.midjourney.com/public/out/clientSideEntry-fawaqcm4.js1262 KB868 KB (69%)✓1st
https://www.googletagmanager.com/gtag/js?id=AW-16508112792146 KB50 KB (34%)✓3rd
https://www.midjourney.com/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 KB—✓1st
https://challenges.cloudflare.com/turnstile/v0/b/625261456364/api.js17 KB—✓3rd
https://www.midjourney.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/625261456364/main.js?13 KB—✓1st
https://googleads.g.doubleclick.net/pagead/viewthroughconversion/16508112792/?random=1775594190450&cv=11&fst=1775594190450&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45be6460v9180911394za200zd9180911394xec&gcd=13n3n3n3n5l1&dma=0&tag_exp=0~115938466~115938468~116991817~117384406&frm=0&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=542347552.1775594190&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&data=event%3Dgtag.config&rfmt=3&fmt=42 KB—✓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

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.

B
Image Optimization
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Info::
All images are well-optimized
16 images 13.0 MB
0 oversized -0 KB
10 legacy format
0 missing dimensions CLS risk
A+
Third-Party Impact
4% third-party, 0 ms blocking
PASS
4% third-party, 0 ms blocking
Info::
Third-party code accounts for 4% of page weight (527.2 KiB of 14.6 MiB)
Info::
Third-party blocking time is low (0 ms)
96%
First-party Third-party
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
2 fonts (82 KB)
PASS
2 fonts (82 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

82 KB total

Render-blocking

0

of 2

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 FCP 1.7 s LCP 1.7 shttps://fonts.gstatic.com/s/dmsans/v17/rP2Hp2ywxg089UriCZOIHTWEBlw.woff2rP2Hp2ywxg089UriCZOIHTW... https://fonts.gstatic.com/s/dmsans/v17/rP2Hp2ywxg089UriCZOIHTWEBlw.woff2 — 61.1 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/jetbrainsmono/v24/tDbY2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKxTOlOVk6OThhvA.woff2tDbY2o-flEEny0FZhsfKu5W... https://fonts.gstatic.com/s/jetbrainsmono/v24/tDbY2o-flEEny0FZhsfKu5WU4zr3E_BX0PnT8RD8yKxTOlOVk6OThhvA.woff2 — 20.7 KiB — 0 ms — font-display: swap
rP2Hp2ywxg089UriCZOIHTW... woff2 swap
Size 61 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
tDbY2o-flEEny0FZhsfKu5W... woff2 swap
Size 21 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
45 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
2% of JavaScript execution is third-party
First-party Third-party 840ms · 146KB · $11/mo
Unattributable
Other
Costly
Execution 739ms
Transfer 0 KB
Monthly Cost $10/mo
Google Tag Manager
Tag Manager
Optional
Execution 101ms
Transfer 146 KB
Unused 34%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 739ms and costs ~$10/month

Unattributable takes 739ms 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

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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