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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
2
REVIEW
5
PASS
8
INFO
2

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

Mobile Desktop
85
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
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.
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.

1.39 s

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

4.26 s

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

22 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.

1.39 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.

4.26 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
17
8 PASS 5 REVIEW 2 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 48 requests
FIX
2.2 MB transferred, 48 requests
Info::
Page weighs 4.2 MB (2.2 MB transferred)
Warning::
Images are 1.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.4 MB
Info::
48 HTTP requests
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
48 requests
0.46 g CO2 per page load
Images 1.4 MiB 63%
JavaScript 495.7 KiB 22%
HTML 171.0 KiB 8%
Fonts 111.0 KiB 5%
CSS 47.5 KiB 2%
Other 9.4 KiB 0%
Other 4.0 KiB 0%
Other 1.1 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Warning::
https://neocities.org/img/neocities-Logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://neocities.org/img/nav-Icon.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://neocities.org/img/cat.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
27 images 1.4 MB
0 oversized -0 KB
13 legacy format
3 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

B
JS Execution Cost
768ms total JS execution
REVIEW
768ms total JS execution
Warning::
https://neocities.org/: 311ms CPU time
Info::
Unattributable: 204ms CPU time
Info::
https://hcaptcha.com/1/api.js: 181ms CPU time
Info::
https://neocities.org/js/jquery-1.11.0.min.js: 72ms CPU time
Warning::
Third-party scripts: 385ms (50% of total)

Main Thread Breakdown

Other 30% Style & Layout 28% Script Evaluation 27% Rendering 6% Script Parsing & Compilation 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://neocities.org/311ms10ms2ms1st
Unattributable204ms4ms0ms3rd
https://hcaptcha.com/1/api.js181ms151ms23ms3rd
https://neocities.org/js/jquery-1.11.0.min.js72ms47ms11ms1st
B
JS Bundles
5 scripts, 51 KB unused
REVIEW
5 scripts, 51 KB unused
Warning::
https://hcaptcha.com/1/api.js: 29 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://neocities.org/js/jquery-1.11.0.min.js: 21 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 51 KB
51 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://hcaptcha.com/1/api.js86 KB29 KB (35%)✓3rd
https://neocities.org/js/jquery-1.11.0.min.js33 KB21 KB (64%)✓1st
https://neocities.org/js/app.min.js1 KB—✓1st
https://neocities.org/js/bootstrap.min.js8 KB—✓1st
https://newassets.hcaptcha.com/c/d20e92d7370b431dfc001500e0cad77b360e4d09203f2848e3cd8edb4fe5e5df/hsw.js369 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

C
Page Weight Inventory
Action
48 resources · 2.2 MB · 51 KB savings available
REVIEW
48 resources · 2.2 MB · 51 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~51 KB of savings available
Info::
10 third-party resources (28% of weight)
Info::
2 resources over 200KB
48 resources · 2.2 MiB · 10 third-party 1.2 MiB over 1MB target
Image 64% · 1.4 MiB
JavaScript 22% · 495.7 KiB
Document 8% · 171.0 KiB
Font 5% · 111.0 KiB
CSS 2% · 47.5 KiB
Other 0% · 1.1 KiB

~50.5 KiB of savings available

Remove unused JavaScript: 50.5 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Third-Party Impact
28% third-party, 0 ms blocking
PASS
28% third-party, 0 ms blocking
Info::
Third-party code accounts for 28% of page weight (624.6 KiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
72%
28%
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
3 fonts (111 KB)
PASS
3 fonts (111 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

111 KB total

Render-blocking

0

of 3

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 4.0 s FCP 1.4 s LCP 4.3 shttps://neocities.org/fonts/fontawesome-webfont.woff2?v=4.3.0fontawesome-webfont.woff2 https://neocities.org/fonts/fontawesome-webfont.woff2?v=4.3.0 — 55.7 KiB — 52 ms — font-display: swaphttps://neocities.org/fonts/Droid_Serif_400.woffDroid_Serif_400.woff https://neocities.org/fonts/Droid_Serif_400.woff — 25.8 KiB — 50 ms — font-display: swaphttps://neocities.org/fonts/Droid_Serif_700.woffDroid_Serif_700.woff https://neocities.org/fonts/Droid_Serif_700.woff — 29.5 KiB — 51 ms — font-display: swap
fontawesome-webfont.woff2 unknown swap
Size 56 KB
Load time 52 ms
Start 247 ms
Risk FOUT — text flashes from fallback to web font
Droid_Serif_400.woff woff swap
Size 26 KB
Load time 50 ms
Start 247 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Droid_Serif_700.woff woff swap
Size 29 KB
Load time 51 ms
Start 247 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~33 KB and ~66 ms

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
Network Waterfall
48 requests over 798ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.4 s LCP 4.3 shttps://neocities.org// https://neocities.org/ — 200 — 6.2 KiB — 82 ms — h2https://neocities.org/css/neo.css/css/neo.css https://neocities.org/css/neo.css — 200 — 17.2 KiB — 38 ms — h2https://neocities.org/js/jquery-1.11.0.min.js/js/jquery-1.11.0.min.js https://neocities.org/js/jquery-1.11.0.min.js — 200 — 33.0 KiB — 64 ms — h2https://neocities.org/img/nav-Icon.png/img/nav-Icon.png https://neocities.org/img/nav-Icon.png — 200 — 372 B — 59 ms — h2https://neocities.org/img/cat.png/img/cat.png https://neocities.org/img/cat.png — 200 — 7.9 KiB — 63 ms — h2https://neocities.org/fonts/fonts.css/fonts/fonts.css https://neocities.org/fonts/fonts.css — 200 — 1.9 KiB — 30 ms — h2https://neocities.org/css/bootstrap.min.css/css/bootstrap.min.css https://neocities.org/css/bootstrap.min.css — 200 — 18.3 KiB — 35 ms — h2https://neocities.org/css/bootstrap-responsive.min.css/css/bootstrap-responsive.min.css https://neocities.org/css/bootstrap-responsive.min.css — 200 — 4.2 KiB — 36 ms — h2https://neocities.org/css/font-awesome.css/css/font-awesome.css https://neocities.org/css/font-awesome.css — 200 — 5.9 KiB — 38 ms — h2https://neocities.org/img/neocities-Logo.png/img/neocities-Logo.png https://neocities.org/img/neocities-Logo.png — 200 — 38.6 KiB — 34 ms — h2https://neocities.org/site_screenshots/30/52/angel99/index.html.540x405.webp/site_screenshots/30/52/angel99/ind... https://neocities.org/site_screenshots/30/52/angel99/index.html.540x405.webp — 200 — 45.5 KiB — 40 ms — h2https://neocities.org/site_screenshots/11/22/astersarchive/index.html.540x405.webp/site_screenshots/11/22/astersarchi... https://neocities.org/site_screenshots/11/22/astersarchive/index.html.540x405.webp — 200 — 96.8 KiB — 37 ms — h2https://neocities.org/js/app.min.js/js/app.min.js https://neocities.org/js/app.min.js — 200 — 516 B — 47 ms — h2https://neocities.org/js/bootstrap.min.js/js/bootstrap.min.js https://neocities.org/js/bootstrap.min.js — 200 — 7.6 KiB — 47 ms — h2https://hcaptcha.com/1/api.jshcaptcha.com/1/api.js https://hcaptcha.com/1/api.js — 200 — 85.8 KiB — 131 ms — h3https://neocities.org/site_screenshots/21/20/marteblog/index.html.540x405.webp/site_screenshots/21/20/marteblog/i... https://neocities.org/site_screenshots/21/20/marteblog/index.html.540x405.webp — 200 — 40.4 KiB — 66 ms — h2https://neocities.org/site_screenshots/46/66/angelogistics/index.html.540x405.webp/site_screenshots/46/66/angelogisti... https://neocities.org/site_screenshots/46/66/angelogistics/index.html.540x405.webp — 200 — 108.1 KiB — 81 ms — h2https://neocities.org/site_screenshots/40/62/misswindow/index.html.540x405.webp/site_screenshots/40/62/misswindow/... https://neocities.org/site_screenshots/40/62/misswindow/index.html.540x405.webp — 200 — 33.3 KiB — 68 ms — h2https://neocities.org/site_screenshots/19/95/ries/index.html.540x405.webp/site_screenshots/19/95/ries/index.... https://neocities.org/site_screenshots/19/95/ries/index.html.540x405.webp — 200 — 38.8 KiB — 71 ms — h2https://neocities.org/site_screenshots/38/61/killing-machine/index.html.540x405.webp/site_screenshots/38/61/killing-mac... https://neocities.org/site_screenshots/38/61/killing-machine/index.html.540x405.webp — 200 — 69.2 KiB — 78 ms — h2https://neocities.org/site_screenshots/53/94/ilmrx/index.html.540x405.webp/site_screenshots/53/94/ilmrx/index... https://neocities.org/site_screenshots/53/94/ilmrx/index.html.540x405.webp — 200 — 12.4 KiB — 53 ms — h2https://neocities.org/site_screenshots/14/64/daniele63/index.html.540x405.webp/site_screenshots/14/64/daniele63/i... https://neocities.org/site_screenshots/14/64/daniele63/index.html.540x405.webp — 200 — 92.3 KiB — 78 ms — h2https://neocities.org/site_screenshots/28/58/allyratworld/index.html.540x405.webp/site_screenshots/28/58/allyratworl... https://neocities.org/site_screenshots/28/58/allyratworld/index.html.540x405.webp — 200 — 52.2 KiB — 72 ms — h2https://neocities.org/site_screenshots/40/87/faoggot/index.html.540x405.webp/site_screenshots/40/87/faoggot/ind... https://neocities.org/site_screenshots/40/87/faoggot/index.html.540x405.webp — 200 — 112.0 KiB — 88 ms — h2https://neocities.org/site_screenshots/35/53/cinni/index.html.540x405.webp/site_screenshots/35/53/cinni/index... https://neocities.org/site_screenshots/35/53/cinni/index.html.540x405.webp — 200 — 68.7 KiB — 78 ms — h2https://neocities.org/img/neocity.png/img/neocity.png https://neocities.org/img/neocity.png — 200 — 60.2 KiB — 80 ms — h2https://neocities.org/img/icons.png/img/icons.png https://neocities.org/img/icons.png — 200 — 2.3 KiB — 79 ms — h2https://neocities.org/img/sign-up-bg.png/img/sign-up-bg.png https://neocities.org/img/sign-up-bg.png — 200 — 421 B — 112 ms — h2https://neocities.org/img/front-editor-screenshot.png/img/front-editor-screenshot.png https://neocities.org/img/front-editor-screenshot.png — 200 — 69.8 KiB — 87 ms — h2https://neocities.org/img/front-browse-screenshot.jpg/img/front-browse-screenshot.jpg https://neocities.org/img/front-browse-screenshot.jpg — 200 — 246.0 KiB — 100 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.4 s LCP 4.3 shttps://neocities.org// https://neocities.org/ — 200 — 6.2 KiB — 82 ms — h2https://neocities.org/css/neo.css/css/neo.css https://neocities.org/css/neo.css — 200 — 17.2 KiB — 38 ms — h2https://neocities.org/js/jquery-1.11.0.min.js/js/jquery-1.11.0.min.js https://neocities.org/js/jquery-1.11.0.min.js — 200 — 33.0 KiB — 64 ms — h2https://neocities.org/img/nav-Icon.png/img/nav-Icon.png https://neocities.org/img/nav-Icon.png — 200 — 372 B — 59 ms — h2https://neocities.org/img/cat.png/img/cat.png https://neocities.org/img/cat.png — 200 — 7.9 KiB — 63 ms — h2https://neocities.org/fonts/fonts.css/fonts/fonts.css https://neocities.org/fonts/fonts.css — 200 — 1.9 KiB — 30 ms — h2https://neocities.org/css/bootstrap.min.css/css/bootstrap.min.css https://neocities.org/css/bootstrap.min.css — 200 — 18.3 KiB — 35 ms — h2https://neocities.org/css/bootstrap-responsive.min.css/css/bootstrap-responsive.min.css https://neocities.org/css/bootstrap-responsive.min.css — 200 — 4.2 KiB — 36 ms — h2https://neocities.org/css/font-awesome.css/css/font-awesome.css https://neocities.org/css/font-awesome.css — 200 — 5.9 KiB — 38 ms — h2https://neocities.org/img/neocities-Logo.png/img/neocities-Logo.png https://neocities.org/img/neocities-Logo.png — 200 — 38.6 KiB — 34 ms — h2https://neocities.org/site_screenshots/30/52/angel99/index.html.540x405.webp/site_screenshots/30/52/angel99/ind... https://neocities.org/site_screenshots/30/52/angel99/index.html.540x405.webp — 200 — 45.5 KiB — 40 ms — h2https://neocities.org/site_screenshots/11/22/astersarchive/index.html.540x405.webp/site_screenshots/11/22/astersarchi... https://neocities.org/site_screenshots/11/22/astersarchive/index.html.540x405.webp — 200 — 96.8 KiB — 37 ms — h2https://neocities.org/js/app.min.js/js/app.min.js https://neocities.org/js/app.min.js — 200 — 516 B — 47 ms — h2https://neocities.org/js/bootstrap.min.js/js/bootstrap.min.js https://neocities.org/js/bootstrap.min.js — 200 — 7.6 KiB — 47 ms — h2https://hcaptcha.com/1/api.jshcaptcha.com/1/api.js https://hcaptcha.com/1/api.js — 200 — 85.8 KiB — 131 ms — h3https://neocities.org/site_screenshots/21/20/marteblog/index.html.540x405.webp/site_screenshots/21/20/marteblog/i... https://neocities.org/site_screenshots/21/20/marteblog/index.html.540x405.webp — 200 — 40.4 KiB — 66 ms — h2https://neocities.org/site_screenshots/46/66/angelogistics/index.html.540x405.webp/site_screenshots/46/66/angelogisti... https://neocities.org/site_screenshots/46/66/angelogistics/index.html.540x405.webp — 200 — 108.1 KiB — 81 ms — h2https://neocities.org/site_screenshots/40/62/misswindow/index.html.540x405.webp/site_screenshots/40/62/misswindow/... https://neocities.org/site_screenshots/40/62/misswindow/index.html.540x405.webp — 200 — 33.3 KiB — 68 ms — h2https://neocities.org/site_screenshots/19/95/ries/index.html.540x405.webp/site_screenshots/19/95/ries/index.... https://neocities.org/site_screenshots/19/95/ries/index.html.540x405.webp — 200 — 38.8 KiB — 71 ms — h2https://neocities.org/site_screenshots/38/61/killing-machine/index.html.540x405.webp/site_screenshots/38/61/killing-mac... https://neocities.org/site_screenshots/38/61/killing-machine/index.html.540x405.webp — 200 — 69.2 KiB — 78 ms — h2https://neocities.org/site_screenshots/53/94/ilmrx/index.html.540x405.webp/site_screenshots/53/94/ilmrx/index... https://neocities.org/site_screenshots/53/94/ilmrx/index.html.540x405.webp — 200 — 12.4 KiB — 53 ms — h2https://neocities.org/site_screenshots/14/64/daniele63/index.html.540x405.webp/site_screenshots/14/64/daniele63/i... https://neocities.org/site_screenshots/14/64/daniele63/index.html.540x405.webp — 200 — 92.3 KiB — 78 ms — h2https://neocities.org/site_screenshots/28/58/allyratworld/index.html.540x405.webp/site_screenshots/28/58/allyratworl... https://neocities.org/site_screenshots/28/58/allyratworld/index.html.540x405.webp — 200 — 52.2 KiB — 72 ms — h2https://neocities.org/site_screenshots/40/87/faoggot/index.html.540x405.webp/site_screenshots/40/87/faoggot/ind... https://neocities.org/site_screenshots/40/87/faoggot/index.html.540x405.webp — 200 — 112.0 KiB — 88 ms — h2https://neocities.org/site_screenshots/35/53/cinni/index.html.540x405.webp/site_screenshots/35/53/cinni/index... https://neocities.org/site_screenshots/35/53/cinni/index.html.540x405.webp — 200 — 68.7 KiB — 78 ms — h2https://neocities.org/img/neocity.png/img/neocity.png https://neocities.org/img/neocity.png — 200 — 60.2 KiB — 80 ms — h2https://neocities.org/img/icons.png/img/icons.png https://neocities.org/img/icons.png — 200 — 2.3 KiB — 79 ms — h2https://neocities.org/img/sign-up-bg.png/img/sign-up-bg.png https://neocities.org/img/sign-up-bg.png — 200 — 421 B — 112 ms — h2https://neocities.org/img/front-editor-screenshot.png/img/front-editor-screenshot.png https://neocities.org/img/front-editor-screenshot.png — 200 — 69.8 KiB — 87 ms — h2https://neocities.org/img/front-browse-screenshot.jpg/img/front-browse-screenshot.jpg https://neocities.org/img/front-browse-screenshot.jpg — 200 — 246.0 KiB — 100 ms — h2https://neocities.org/img/front-follow-screenshot.jpg/img/front-follow-screenshot.jpg https://neocities.org/img/front-follow-screenshot.jpg — 200 — 116.8 KiB — 91 ms — h2https://neocities.org/img/front-comment-screenshot.png/img/front-comment-screenshot.png https://neocities.org/img/front-comment-screenshot.png — 200 — 71.0 KiB — 88 ms — h2https://neocities.org/img/catbus-index.png/img/catbus-index.png https://neocities.org/img/catbus-index.png — 200 — 15.0 KiB — 92 ms — h2https://neocities.org/img/about-neocities.png/img/about-neocities.png https://neocities.org/img/about-neocities.png — 200 — 12.9 KiB — 95 ms — h2https://neocities.org/img/latest-news.png/img/latest-news.png https://neocities.org/img/latest-news.png — 200 — 15.9 KiB — 95 ms — h2https://neocities.org/fonts/fontawesome-webfont.woff2?v=4.3.0/fonts/fontawesome-webfont.woff2?v=... https://neocities.org/fonts/fontawesome-webfont.woff2?v=4.3.0 — 200 — 55.7 KiB — 52 ms — h2https://neocities.org/fonts/Droid_Serif_400.woff/fonts/Droid_Serif_400.woff https://neocities.org/fonts/Droid_Serif_400.woff — 200 — 25.8 KiB — 50 ms — h2https://neocities.org/fonts/Droid_Serif_700.woff/fonts/Droid_Serif_700.woff https://neocities.org/fonts/Droid_Serif_700.woff — 200 — 29.5 KiB — 51 ms — h2https://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.htmlnewassets.hcaptcha.com/captcha/v1/7... https://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.html — 200 — 164.9 KiB — 160 ms — h3https://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.htmlnewassets.hcaptcha.com/captcha/v1/7... 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
50% of JavaScript execution is third-party
First-party Third-party 385ms · 86KB · $5/mo
Unattributable
Other
Costly
Execution 204ms
Transfer 0 KB
Monthly Cost $3/mo
hcaptcha.com
Other
Optional
Execution 181ms
Transfer 86 KB
Unused 35%
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • Unattributable adds 204ms and costs ~$3/month

50% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 204ms 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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