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https://openresty.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
2
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
95
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
81
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
82
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.

760 ms

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

1.25 s

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

35 ms

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

0.087

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

986 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.25 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
15
7 PASS 4 REVIEW 2 FIX
F
Page Weight Budget
Action
16.5 MB transferred, 52 requests
FIX
16.5 MB transferred, 52 requests
Critical::
Page weighs 16.7 MB (16.5 MB transferred)
Warning::
Images are 16.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 16.3 MB
Info::
52 HTTP requests
Info::
Estimated 3.5 g CO2 per page load
16.5 MB / 2.4 MB budget
16.5 MB transferred
52 requests
3.5 g CO2 per page load
Images 16.3 MiB 99%
JavaScript 123.2 KiB 1%
Fonts 54.4 KiB 0%
CSS 14.5 KiB 0%
HTML 10.9 KiB 0%
Other 4.6 KiB 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

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
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
https://openresty.org/images/logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openresty.org/images/ico-github.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openresty.org/images/rocket.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openresty.org/images/flarum.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 16.3 MB
0 oversized -0 KB
30 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

B
JS Execution Cost
613ms total JS execution
REVIEW
613ms total JS execution
Warning::
https://openresty.org/en/: 308ms CPU time
Warning::
Unattributable: 305ms CPU time
Info::
Third-party scripts: 305ms (50% of total)

Main Thread Breakdown

Other 67% Style & Layout 17% Script Evaluation 8% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://openresty.org/en/308ms19ms1ms1st
Unattributable305ms2ms0ms3rd
C
Page Weight Inventory
Action
52 resources · 16.5 MB · 50 KB savings available
REVIEW
52 resources · 16.5 MB · 50 KB savings available
Warning::
Page weight 15.5 MB over 1MB target
Got: 16.5 MB Expected: ≤ 1 MB
Info::
7 third-party resources (0% of weight)
Info::
16 resources over 200KB
52 resources · 16.5 MiB · 7 third-party 15.5 MiB over 1MB target
Image 99% · 16.3 MiB
JavaScript 1% · 123.2 KiB
Font 0% · 54.4 KiB
CSS 0% · 14.5 KiB
Document 0% · 11.2 KiB

~49.8 KiB of savings available

Remove unused JavaScript: 49.8 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
0% third-party, 0 ms blocking
PASS
0% third-party, 0 ms blocking
Info::
Third-party code accounts for 0% of page weight (66.9 KiB of 16.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
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
6 fonts (54 KB)
PASS
6 fonts (54 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

54 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 FCP 760 ms LCP 1.2 shttps://openresty.org/fonts/Open-Sans-regular/Open-Sans-regular.woff2Open-Sans-regular.woff2 https://openresty.org/fonts/Open-Sans-regular/Open-Sans-regular.woff2 — 10.4 KiB — 520 ms — font-display: swaphttps://openresty.org/fonts/Open-Sans-700/Open-Sans-700.woff2Open-Sans-700.woff2 https://openresty.org/fonts/Open-Sans-700/Open-Sans-700.woff2 — 10.4 KiB — 522 ms — font-display: swaphttps://openresty.org/fonts/Open-Sans-300/Open-Sans-300.woff2Open-Sans-300.woff2 https://openresty.org/fonts/Open-Sans-300/Open-Sans-300.woff2 — 10.3 KiB — 530 ms — font-display: swaphttps://openresty.org/fonts/Open-Sans-700italic/Open-Sans-700italic.woff2Open-Sans-700italic.woff2 https://openresty.org/fonts/Open-Sans-700italic/Open-Sans-700italic.woff2 — 10.7 KiB — 535 ms — font-display: swaphttps://openresty.org/fonts/Open-Sans-italic/Open-Sans-italic.woff2Open-Sans-italic.woff2 https://openresty.org/fonts/Open-Sans-italic/Open-Sans-italic.woff2 — 11.0 KiB — 536 ms — font-display: swapdata:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA…font-woff;charset=utf-8... data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA… — 1.6 KiB — 12 ms — font-display: swap
Open-Sans-regular.woff2 woff2 swap
Size 10 KB
Load time 520 ms
Start 665 ms
Risk FOUT — text flashes from fallback to web font
Open-Sans-700.woff2 woff2 swap
Size 10 KB
Load time 522 ms
Start 665 ms
Risk FOUT — text flashes from fallback to web font
Open-Sans-300.woff2 woff2 swap
Size 10 KB
Load time 530 ms
Start 665 ms
Risk FOUT — text flashes from fallback to web font
Open-Sans-700italic.woff2 woff2 swap
Size 11 KB
Load time 535 ms
Start 666 ms
Risk FOUT — text flashes from fallback to web font
Open-Sans-italic.woff2 woff2 swap
Size 11 KB
Load time 536 ms
Start 666 ms
Risk FOUT — text flashes from fallback to web font
font-woff;charset=utf-8... woff swap
Size 2 KB
Load time 12 ms
Start 748 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)
A+
JS Bundles
8 scripts, 50 KB unused
PASS
8 scripts, 50 KB unused
Warning::
https://openresty.org/js/jquery.min.js: 25 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.openresty.com/swiper/5.2.1/js/swipe...: 24 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 50 KB
50 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://openresty.org/js/jquery.min.js38 KB25 KB (67%)✓1st
https://static.openresty.com/swiper/5.2.1/js/swiper.min.js42 KB24 KB (58%)✓3rd
https://openresty.org/js/jquery.modal.min.js2 KB—✓1st
https://openresty.org/js/highlight.pack.js22 KB—✓1st
https://openresty.org/js/main.js1 KB—✓1st
https://ws.zoominfo.com/pixel/63bd97fc4e23807e8ea36b951 KB—✓3rd
https://ssl.google-analytics.com/ga.js17 KB—✓3rd
https://heatmap.openresty.com/clickheat/js/clickheat.js0 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

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
52 requests over 2302ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 760 ms LCP 1.2 shttps://openresty.org// https://openresty.org/ — 302 — 258 B — 289 ms — h2https://openresty.org/en//en/ https://openresty.org/en/ — 200 — 10.9 KiB — 48 ms — h2https://openresty.org/css/fonts.css/css/fonts.css https://openresty.org/css/fonts.css — 200 — 756 B — 88 ms — h3https://openresty.org/css/main.css/css/main.css https://openresty.org/css/main.css — 200 — 6.1 KiB — 134 ms — h3https://openresty.org/css/github.css/css/github.css https://openresty.org/css/github.css — 200 — 808 B — 180 ms — h3https://openresty.org/css/jquery.modal.css/css/jquery.modal.css https://openresty.org/css/jquery.modal.css — 200 — 2.2 KiB — 230 ms — h3https://openresty.org/images/logo.png/images/logo.png https://openresty.org/images/logo.png — 200 — 16.1 KiB — 277 ms — h3https://openresty.org/images/ico-github.png/images/ico-github.png https://openresty.org/images/ico-github.png — 200 — 2.0 KiB — 325 ms — h3https://openresty.org/images/flarum.png/images/flarum.png https://openresty.org/images/flarum.png — 200 — 1.2 KiB — 139 ms — h3https://openresty.org/images/rocket.svg/images/rocket.svg https://openresty.org/images/rocket.svg — 200 — 1.2 KiB — 188 ms — h3https://openresty.org/images/search.svg/images/search.svg https://openresty.org/images/search.svg — 200 — 898 B — 234 ms — h3https://static.openresty.com/swiper/5.2.1/css/swiper.min.cssstatic.openresty.com/swiper/5.2.1/c... https://static.openresty.com/swiper/5.2.1/css/swiper.min.css — 200 — 4.7 KiB — 157 ms — h2https://static.openresty.com/swiper/5.2.1/js/swiper.min.jsstatic.openresty.com/swiper/5.2.1/j... https://static.openresty.com/swiper/5.2.1/js/swiper.min.js — 200 — 42.2 KiB — 186 ms — h2https://openresty.org/js/jquery.min.js/js/jquery.min.js https://openresty.org/js/jquery.min.js — 200 — 38.3 KiB — 284 ms — h3https://openresty.org/js/jquery.modal.min.js/js/jquery.modal.min.js https://openresty.org/js/jquery.modal.min.js — 200 — 2.1 KiB — 327 ms — h3https://openresty.org/js/highlight.pack.js/js/highlight.pack.js https://openresty.org/js/highlight.pack.js — 200 — 21.7 KiB — 376 ms — h3https://openresty.org/js/main.js/js/main.js https://openresty.org/js/main.js — 200 — 1001 B — 422 ms — h3https://openresty.org/images/donate_paypal.gif/images/donate_paypal.gif https://openresty.org/images/donate_paypal.gif — 200 — 5.7 KiB — 470 ms — h3https://openresty.org/images/logo.webp/images/logo.webp https://openresty.org/images/logo.webp — 200 — 5.6 KiB — 516 ms — h3https://ws.zoominfo.com/pixel/63bd97fc4e23807e8ea36b95ws.zoominfo.com/pixel/63bd97fc4e238... https://ws.zoominfo.com/pixel/63bd97fc4e23807e8ea36b95 — 404 — 568 B — 89 ms — h3https://openresty.org/images/bg-grid.png/images/bg-grid.png https://openresty.org/images/bg-grid.png — 200 — 29.2 KiB — 522 ms — h3https://openresty.org/images/media-server.png/images/media-server.png https://openresty.org/images/media-server.png — 200 — 102.5 KiB — 542 ms — h3https://openresty.org/images/ico-search.png/images/ico-search.png https://openresty.org/images/ico-search.png — 200 — 1.6 KiB — 526 ms — h3https://openresty.org/images/header-images/xray-vulnerability-scanning.jpg/images/header-images/xray-vulnerab... https://openresty.org/images/header-images/xray-vulnerability-scanning.jpg — 200 — 3.0 MiB — 1.6 s — h3https://openresty.org/images/header-images/xray-logo.jpg/images/header-images/xray-logo.jpg https://openresty.org/images/header-images/xray-logo.jpg — 200 — 7.6 KiB — 531 ms — h3https://openresty.org/images/header-images/edge-proxy-protocol.jpg/images/header-images/edge-proxy-pr... https://openresty.org/images/header-images/edge-proxy-protocol.jpg — 200 — 2.1 MiB — 1.3 s — h3https://openresty.org/images/header-images/xray-dynamic-advantage.jpg/images/header-images/xray-dynamic-... https://openresty.org/images/header-images/xray-dynamic-advantage.jpg — 200 — 2.6 MiB — 1.5 s — h3https://openresty.org/images/header-images/what-is-openresty-edge.jpg/images/header-images/what-is-openr... https://openresty.org/images/header-images/what-is-openresty-edge.jpg — 200 — 1.4 MiB — 1.1 s — h3https://openresty.org/images/header-images/what-is-openresty-xray.jpg/images/header-images/what-is-openr... https://openresty.org/images/header-images/what-is-openresty-xray.jpg — 200 — 1.5 MiB — 1.2 s — h3https://openresty.org/images/header-images/edge-gslb-what.jpg/images/header-images/edge-gslb-wha... https://openresty.org/images/header-images/edge-gslb-what.jpg — 200 — 1.1 MiB — 1.1 s — h3
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 760 ms LCP 1.2 shttps://openresty.org// https://openresty.org/ — 302 — 258 B — 289 ms — h2https://openresty.org/en//en/ https://openresty.org/en/ — 200 — 10.9 KiB — 48 ms — h2https://openresty.org/css/fonts.css/css/fonts.css https://openresty.org/css/fonts.css — 200 — 756 B — 88 ms — h3https://openresty.org/css/main.css/css/main.css https://openresty.org/css/main.css — 200 — 6.1 KiB — 134 ms — h3https://openresty.org/css/github.css/css/github.css https://openresty.org/css/github.css — 200 — 808 B — 180 ms — h3https://openresty.org/css/jquery.modal.css/css/jquery.modal.css https://openresty.org/css/jquery.modal.css — 200 — 2.2 KiB — 230 ms — h3https://openresty.org/images/logo.png/images/logo.png https://openresty.org/images/logo.png — 200 — 16.1 KiB — 277 ms — h3https://openresty.org/images/ico-github.png/images/ico-github.png https://openresty.org/images/ico-github.png — 200 — 2.0 KiB — 325 ms — h3https://openresty.org/images/flarum.png/images/flarum.png https://openresty.org/images/flarum.png — 200 — 1.2 KiB — 139 ms — h3https://openresty.org/images/rocket.svg/images/rocket.svg https://openresty.org/images/rocket.svg — 200 — 1.2 KiB — 188 ms — h3https://openresty.org/images/search.svg/images/search.svg https://openresty.org/images/search.svg — 200 — 898 B — 234 ms — h3https://static.openresty.com/swiper/5.2.1/css/swiper.min.cssstatic.openresty.com/swiper/5.2.1/c... https://static.openresty.com/swiper/5.2.1/css/swiper.min.css — 200 — 4.7 KiB — 157 ms — h2https://static.openresty.com/swiper/5.2.1/js/swiper.min.jsstatic.openresty.com/swiper/5.2.1/j... https://static.openresty.com/swiper/5.2.1/js/swiper.min.js — 200 — 42.2 KiB — 186 ms — h2https://openresty.org/js/jquery.min.js/js/jquery.min.js https://openresty.org/js/jquery.min.js — 200 — 38.3 KiB — 284 ms — h3https://openresty.org/js/jquery.modal.min.js/js/jquery.modal.min.js https://openresty.org/js/jquery.modal.min.js — 200 — 2.1 KiB — 327 ms — h3https://openresty.org/js/highlight.pack.js/js/highlight.pack.js https://openresty.org/js/highlight.pack.js — 200 — 21.7 KiB — 376 ms — h3https://openresty.org/js/main.js/js/main.js https://openresty.org/js/main.js — 200 — 1001 B — 422 ms — h3https://openresty.org/images/donate_paypal.gif/images/donate_paypal.gif https://openresty.org/images/donate_paypal.gif — 200 — 5.7 KiB — 470 ms — h3https://openresty.org/images/logo.webp/images/logo.webp https://openresty.org/images/logo.webp — 200 — 5.6 KiB — 516 ms — h3https://ws.zoominfo.com/pixel/63bd97fc4e23807e8ea36b95ws.zoominfo.com/pixel/63bd97fc4e238... https://ws.zoominfo.com/pixel/63bd97fc4e23807e8ea36b95 — 404 — 568 B — 89 ms — h3https://openresty.org/images/bg-grid.png/images/bg-grid.png https://openresty.org/images/bg-grid.png — 200 — 29.2 KiB — 522 ms — h3https://openresty.org/images/media-server.png/images/media-server.png https://openresty.org/images/media-server.png — 200 — 102.5 KiB — 542 ms — h3https://openresty.org/images/ico-search.png/images/ico-search.png https://openresty.org/images/ico-search.png — 200 — 1.6 KiB — 526 ms — h3https://openresty.org/images/header-images/xray-vulnerability-scanning.jpg/images/header-images/xray-vulnerab... https://openresty.org/images/header-images/xray-vulnerability-scanning.jpg — 200 — 3.0 MiB — 1.6 s — h3https://openresty.org/images/header-images/xray-logo.jpg/images/header-images/xray-logo.jpg https://openresty.org/images/header-images/xray-logo.jpg — 200 — 7.6 KiB — 531 ms — h3https://openresty.org/images/header-images/edge-proxy-protocol.jpg/images/header-images/edge-proxy-pr... https://openresty.org/images/header-images/edge-proxy-protocol.jpg — 200 — 2.1 MiB — 1.3 s — h3https://openresty.org/images/header-images/xray-dynamic-advantage.jpg/images/header-images/xray-dynamic-... https://openresty.org/images/header-images/xray-dynamic-advantage.jpg — 200 — 2.6 MiB — 1.5 s — h3https://openresty.org/images/header-images/what-is-openresty-edge.jpg/images/header-images/what-is-openr... https://openresty.org/images/header-images/what-is-openresty-edge.jpg — 200 — 1.4 MiB — 1.1 s — h3https://openresty.org/images/header-images/what-is-openresty-xray.jpg/images/header-images/what-is-openr... https://openresty.org/images/header-images/what-is-openresty-xray.jpg — 200 — 1.5 MiB — 1.2 s — h3https://openresty.org/images/header-images/edge-gslb-what.jpg/images/header-images/edge-gslb-wha... https://openresty.org/images/header-images/edge-gslb-what.jpg — 200 — 1.1 MiB — 1.1 s — h3https://openresty.org/images/header-images/nginx-prod-mem-leak.jpg/images/header-images/nginx-prod-me... https://openresty.org/images/header-images/nginx-prod-mem-leak.jpg — 200 — 1.8 MiB — 1.3 s — h3https://openresty.org/images/header-images/xray-keepalive.jpg/images/header-images/xray-keepaliv... https://openresty.org/images/header-images/xray-keepalive.jpg — 200 — 307.3 KiB — 778 ms — h3https://openresty.org/images/header-images/why-edge-waf.jpg/images/header-images/why-edge-waf.... https://openresty.org/images/header-images/why-edge-waf.jpg — 200 — 209.3 KiB — 743 ms — h3https://openresty.org/images/header-images/luajit-plus.jpg/images/header-images/luajit-plus.j... https://openresty.org/images/header-images/luajit-plus.jpg — 200 — 301.6 KiB — 841 ms — h3https://openresty.org/images/header-images/why-edge-webhook.jpg/images/header-images/why-edge-webh... https://openresty.org/images/header-images/why-edge-webhook.jpg — 200 — 251.3 KiB — 776 ms — h3https://openresty.org/images/header-images/xray-p99.jpg/images/header-images/xray-p99.jpg https://openresty.org/images/header-images/xray-p99.jpg — 200 — 315.9 KiB — 841 ms — h3https://openresty.org/images/header-images/edge-or-comparison.jpg/images/header-images/edge-or-compa... https://openresty.org/images/header-images/edge-or-comparison.jpg — 200 — 241.9 KiB — 781 ms — h3https://openresty.org/images/header-images/edge-cdn-benefit.jpg/images/header-images/edge-cdn-bene... https://openresty.org/images/header-images/edge-cdn-benefit.jpg — 200 — 24.9 KiB — 574 ms — h3https://openresty.org/images/header-images/xray-java-mem.jpg/images/header-images/xray-java-mem... https://openresty.org/images/header-images/xray-java-mem.jpg — 200 — 278.5 KiB — 809 ms — h3https://openresty.org/images/header-images/xray-rsa-cpu.jpg/images/header-images/xray-rsa-cpu.... https://openresty.org/images/header-images/xray-rsa-cpu.jpg — 200 — 21.5 KiB — 579 ms — h3https://openresty.org/images/header-images/xray-gzip-cpu.jpg/images/header-images/xray-gzip-cpu... https://openresty.org/images/header-images/xray-gzip-cpu.jpg — 200 — 335.2 KiB — 840 ms — h3https://openresty.org/images/header-images/edge-zstd.jpg/images/header-images/edge-zstd.jpg https://openresty.org/images/header-images/edge-zstd.jpg — 200 — 350.9 KiB — 841 ms — 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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 305ms · 0KB · $4/mo
Unattributable
Other
Costly
Execution 305ms
Transfer 0 KB
Monthly Cost $4/mo

These scripts may cost more than they're worth

  • Unattributable adds 305ms and costs ~$4/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 305ms 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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