Skip to content
https://openresty.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
2
REVIEW
4
PASS
9
INFO
2

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

Mobile Desktop
70
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
78
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.

2.03 s

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

43.54 s

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

7 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.

4.55 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.

43.55 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
9 PASS 4 REVIEW 2 FIX
F
Page Weight Budget
Action
16.4 MB transferred, 51 requests
FIX
16.4 MB transferred, 51 requests
Critical::
Page weighs 16.6 MB (16.4 MB transferred)
Warning::
Images are 16.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 16.2 MB
Info::
51 HTTP requests
Info::
Estimated 3.4 g CO2 per page load
16.4 MB / 2.4 MB budget
16.4 MB transferred
51 requests
3.4 g CO2 per page load
Images 16.2 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
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
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/flarum.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/logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
29 images 16.2 MB
0 oversized -0 KB
29 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
JS Execution Cost
Action
1955ms total JS execution
REVIEW
1955ms total JS execution
Warning::
Unattributable: 1245ms CPU time
Warning::
https://openresty.org/en/: 436ms CPU time
Info::
https://openresty.org/js/jquery.min.js: 137ms CPU time
Info::
https://static.openresty.com/swiper/5.2.1/js/swipe...: 85ms CPU time
Info::
https://ssl.google-analytics.com/ga.js: 53ms CPU time
Warning::
Third-party scripts: 1383ms (71% of total)

Main Thread Breakdown

Other 64% Style & Layout 17% Script Evaluation 11%
ScriptTotalScriptingParse/CompileParty
Unattributable1245ms7ms0ms3rd
https://openresty.org/en/436ms75ms5ms1st
https://openresty.org/js/jquery.min.js137ms45ms12ms1st
https://static.openresty.com/swiper/5.2.1/js/swiper.min.js85ms25ms18ms3rd
https://ssl.google-analytics.com/ga.js53ms47ms6ms3rd
C
Page Weight Inventory
Action
51 resources · 16.4 MB · 50 KB savings available
REVIEW
51 resources · 16.4 MB · 50 KB savings available
Warning::
Page weight 15.4 MB over 1MB target
Got: 16.4 MB Expected: ≤ 1 MB
Info::
7 third-party resources (0% of weight)
Info::
16 resources over 200KB
51 resources · 16.4 MiB · 7 third-party 15.4 MiB over 1MB target
Image 99% · 16.2 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 16.4 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s FCP 2.0 s LCP 43.5 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 — 524 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 — 525 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 — 526 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 — 527 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 — 528 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 — 21 ms — font-display: swap
Open-Sans-regular.woff2 woff2 swap
Size 10 KB
Load time 524 ms
Start 532 ms
Risk FOUT — text flashes from fallback to web font
Open-Sans-700.woff2 woff2 swap
Size 10 KB
Load time 525 ms
Start 532 ms
Risk FOUT — text flashes from fallback to web font
Open-Sans-300.woff2 woff2 swap
Size 10 KB
Load time 526 ms
Start 532 ms
Risk FOUT — text flashes from fallback to web font
Open-Sans-700italic.woff2 woff2 swap
Size 11 KB
Load time 527 ms
Start 533 ms
Risk FOUT — text flashes from fallback to web font
Open-Sans-italic.woff2 woff2 swap
Size 11 KB
Load time 528 ms
Start 533 ms
Risk FOUT — text flashes from fallback to web font
font-woff;charset=utf-8... woff swap
Size 2 KB
Load time 21 ms
Start 1.2 s
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
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
51 requests over 2413ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s FCP 2.0 s LCP 43.5 shttps://openresty.org// https://openresty.org/ — 302 — 258 B — 226 ms — h2https://openresty.org/en//en/ https://openresty.org/en/ — 200 — 10.9 KiB — 47 ms — h2https://openresty.org/css/fonts.css/css/fonts.css https://openresty.org/css/fonts.css — 200 — 756 B — 38 ms — h3https://openresty.org/css/main.css/css/main.css https://openresty.org/css/main.css — 200 — 6.1 KiB — 85 ms — h3https://openresty.org/css/github.css/css/github.css https://openresty.org/css/github.css — 200 — 808 B — 131 ms — h3https://openresty.org/css/jquery.modal.css/css/jquery.modal.css https://openresty.org/css/jquery.modal.css — 200 — 2.2 KiB — 179 ms — h3https://openresty.org/images/logo.png/images/logo.png https://openresty.org/images/logo.png — 200 — 16.1 KiB — 227 ms — h3https://openresty.org/images/ico-github.png/images/ico-github.png https://openresty.org/images/ico-github.png — 200 — 2.0 KiB — 275 ms — h3https://openresty.org/images/flarum.png/images/flarum.png https://openresty.org/images/flarum.png — 200 — 1.2 KiB — 140 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 — 897 B — 233 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 — 301 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 — 328 ms — h2https://openresty.org/js/jquery.min.js/js/jquery.min.js https://openresty.org/js/jquery.min.js — 200 — 38.3 KiB — 281 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 — 328 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 — 517 ms — h3https://ws.zoominfo.com/pixel/63bd97fc4e23807e8ea36b95ws.zoominfo.com/pixel/63bd97fc4e238... https://ws.zoominfo.com/pixel/63bd97fc4e23807e8ea36b95 — 404 — 566 B — 73 ms — h3https://openresty.org/images/bg-grid.png/images/bg-grid.png https://openresty.org/images/bg-grid.png — 200 — 29.2 KiB — 523 ms — h3https://openresty.org/images/ico-search.png/images/ico-search.png https://openresty.org/images/ico-search.png — 200 — 1.6 KiB — 523 ms — h3https://openresty.org/fonts/Open-Sans-regular/Open-Sans-regular.woff2/fonts/Open-Sans-regular/Open-Sans-... https://openresty.org/fonts/Open-Sans-regular/Open-Sans-regular.woff2 — 200 — 10.4 KiB — 524 ms — h3https://openresty.org/fonts/Open-Sans-700/Open-Sans-700.woff2/fonts/Open-Sans-700/Open-Sans-700.... https://openresty.org/fonts/Open-Sans-700/Open-Sans-700.woff2 — 200 — 10.4 KiB — 525 ms — h3https://openresty.org/fonts/Open-Sans-300/Open-Sans-300.woff2/fonts/Open-Sans-300/Open-Sans-300.... https://openresty.org/fonts/Open-Sans-300/Open-Sans-300.woff2 — 200 — 10.3 KiB — 526 ms — h3https://openresty.org/fonts/Open-Sans-700italic/Open-Sans-700italic.woff2/fonts/Open-Sans-700italic/Open-San... https://openresty.org/fonts/Open-Sans-700italic/Open-Sans-700italic.woff2 — 200 — 10.7 KiB — 527 ms — h3https://openresty.org/fonts/Open-Sans-italic/Open-Sans-italic.woff2/fonts/Open-Sans-italic/Open-Sans-i... https://openresty.org/fonts/Open-Sans-italic/Open-Sans-italic.woff2 — 200 — 11.0 KiB — 528 ms — h3https://ssl.google-analytics.com/ga.jsssl.google-analytics.com/ga.js https://ssl.google-analytics.com/ga.js — 200 — 17.4 KiB — 20 ms — h2https://heatmap.openresty.com/clickheat/js/clickheat.jsheatmap.openresty.com/clickheat/js/... https://heatmap.openresty.com/clickheat/js/clickheat.js — -1 — 0 B — 301 ms — https://ssl.google-analytics.com/r/__utm.gif?utmwv=5.7.2&utms=1&utmn=468823459&utmhn=openresty.org&utmcs=UTF-8&utmsr=412x823&utmvp=412x823&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=OpenResty%C2%AE%20-%20Open%20source&utmhid=149751567&utmr=-&utmp=%2Fen%2F&utmht=1776901973291&utmac=UA-24724965-1&utmcc=__utma%3D37978621.1464608472.1776901973.1776901973.1776901973.1%3B%2B__utmz%3D37978621.1776901973.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=1433479998&utmredir=1&utmu=qAAAAAAAAAAAAAAAAAAAAAAE~ssl.google-analytics.com/r/__utm.gi... https://ssl.google-analytics.com/r/__utm.gif?utmwv=5.7.2&utms=1&utmn=468823459&utmhn=openresty.org&utmcs=UTF-8&utmsr=412x823&utmvp=412x823&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=OpenResty%C2%AE%20-%20Open%20source&utmhid=149751567&utmr=-&utmp=%2Fen%2F&utmht=1776901973291&utmac=UA-24724965-1&utmcc=__utma%3D37978621.1464608472.1776901973.1776901973.1776901973.1%3B%2B__utmz%3D37978621.1776901973.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=1433479998&utmredir=1&utmu=qAAAAAAAAAAAAAAAAAAAAAAE~ — 200 — 440 B — 19 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s FCP 2.0 s LCP 43.5 shttps://openresty.org// https://openresty.org/ — 302 — 258 B — 226 ms — h2https://openresty.org/en//en/ https://openresty.org/en/ — 200 — 10.9 KiB — 47 ms — h2https://openresty.org/css/fonts.css/css/fonts.css https://openresty.org/css/fonts.css — 200 — 756 B — 38 ms — h3https://openresty.org/css/main.css/css/main.css https://openresty.org/css/main.css — 200 — 6.1 KiB — 85 ms — h3https://openresty.org/css/github.css/css/github.css https://openresty.org/css/github.css — 200 — 808 B — 131 ms — h3https://openresty.org/css/jquery.modal.css/css/jquery.modal.css https://openresty.org/css/jquery.modal.css — 200 — 2.2 KiB — 179 ms — h3https://openresty.org/images/logo.png/images/logo.png https://openresty.org/images/logo.png — 200 — 16.1 KiB — 227 ms — h3https://openresty.org/images/ico-github.png/images/ico-github.png https://openresty.org/images/ico-github.png — 200 — 2.0 KiB — 275 ms — h3https://openresty.org/images/flarum.png/images/flarum.png https://openresty.org/images/flarum.png — 200 — 1.2 KiB — 140 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 — 897 B — 233 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 — 301 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 — 328 ms — h2https://openresty.org/js/jquery.min.js/js/jquery.min.js https://openresty.org/js/jquery.min.js — 200 — 38.3 KiB — 281 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 — 328 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 — 517 ms — h3https://ws.zoominfo.com/pixel/63bd97fc4e23807e8ea36b95ws.zoominfo.com/pixel/63bd97fc4e238... https://ws.zoominfo.com/pixel/63bd97fc4e23807e8ea36b95 — 404 — 566 B — 73 ms — h3https://openresty.org/images/bg-grid.png/images/bg-grid.png https://openresty.org/images/bg-grid.png — 200 — 29.2 KiB — 523 ms — h3https://openresty.org/images/ico-search.png/images/ico-search.png https://openresty.org/images/ico-search.png — 200 — 1.6 KiB — 523 ms — h3https://openresty.org/fonts/Open-Sans-regular/Open-Sans-regular.woff2/fonts/Open-Sans-regular/Open-Sans-... https://openresty.org/fonts/Open-Sans-regular/Open-Sans-regular.woff2 — 200 — 10.4 KiB — 524 ms — h3https://openresty.org/fonts/Open-Sans-700/Open-Sans-700.woff2/fonts/Open-Sans-700/Open-Sans-700.... https://openresty.org/fonts/Open-Sans-700/Open-Sans-700.woff2 — 200 — 10.4 KiB — 525 ms — h3https://openresty.org/fonts/Open-Sans-300/Open-Sans-300.woff2/fonts/Open-Sans-300/Open-Sans-300.... https://openresty.org/fonts/Open-Sans-300/Open-Sans-300.woff2 — 200 — 10.3 KiB — 526 ms — h3https://openresty.org/fonts/Open-Sans-700italic/Open-Sans-700italic.woff2/fonts/Open-Sans-700italic/Open-San... https://openresty.org/fonts/Open-Sans-700italic/Open-Sans-700italic.woff2 — 200 — 10.7 KiB — 527 ms — h3https://openresty.org/fonts/Open-Sans-italic/Open-Sans-italic.woff2/fonts/Open-Sans-italic/Open-Sans-i... https://openresty.org/fonts/Open-Sans-italic/Open-Sans-italic.woff2 — 200 — 11.0 KiB — 528 ms — h3https://ssl.google-analytics.com/ga.jsssl.google-analytics.com/ga.js https://ssl.google-analytics.com/ga.js — 200 — 17.4 KiB — 20 ms — h2https://heatmap.openresty.com/clickheat/js/clickheat.jsheatmap.openresty.com/clickheat/js/... https://heatmap.openresty.com/clickheat/js/clickheat.js — -1 — 0 B — 301 ms — https://ssl.google-analytics.com/r/__utm.gif?utmwv=5.7.2&utms=1&utmn=468823459&utmhn=openresty.org&utmcs=UTF-8&utmsr=412x823&utmvp=412x823&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=OpenResty%C2%AE%20-%20Open%20source&utmhid=149751567&utmr=-&utmp=%2Fen%2F&utmht=1776901973291&utmac=UA-24724965-1&utmcc=__utma%3D37978621.1464608472.1776901973.1776901973.1776901973.1%3B%2B__utmz%3D37978621.1776901973.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=1433479998&utmredir=1&utmu=qAAAAAAAAAAAAAAAAAAAAAAE~ssl.google-analytics.com/r/__utm.gi... https://ssl.google-analytics.com/r/__utm.gif?utmwv=5.7.2&utms=1&utmn=468823459&utmhn=openresty.org&utmcs=UTF-8&utmsr=412x823&utmvp=412x823&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=OpenResty%C2%AE%20-%20Open%20source&utmhid=149751567&utmr=-&utmp=%2Fen%2F&utmht=1776901973291&utmac=UA-24724965-1&utmcc=__utma%3D37978621.1464608472.1776901973.1776901973.1776901973.1%3B%2B__utmz%3D37978621.1776901973.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=1433479998&utmredir=1&utmu=qAAAAAAAAAAAAAAAAAAAAAAE~ — 200 — 440 B — 19 ms — h2data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA…data:application/font-woff;charset=... data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA… — 200 — 1.6 KiB — 21 ms — datahttps://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 — 1.1 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 — 185 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 — 955 ms — 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 — 1.2 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 — 860 ms — 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 — 927 ms — 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 — 881 ms — 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 — 1.1 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 — 726 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 — 641 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 — 683 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 — 611 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 — 646 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 — 646 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 — 591 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 — 684 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 — 574 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 — 712 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 — 737 ms — h3https://openresty.org/favicon.ico/favicon.ico https://openresty.org/favicon.ico — 200 — 4.3 KiB — 20 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
71% of JavaScript execution is third-party
First-party Third-party 1383ms · 60KB · $18/mo
Unattributable
Other
Costly
Execution 1245ms
Transfer 0 KB
Monthly Cost $17/mo
static.openresty.com
Other
Optional
Execution 85ms
Transfer 42 KB
Unused 58%
Monthly Cost $1/mo
Google Analytics
Analytics
Optional
Execution 53ms
Transfer 17 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1245ms and costs ~$17/month

71% 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

Unattributable takes 1245ms 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

58% of static.openresty.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.

Send Feedback