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https://jcp.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
95
GRADE
A
FIX
1
REVIEW
3
PASS
11
INFO
2

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

Mobile Desktop
94
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
56
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

2.01 s

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

2.01 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.

0.034

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

4.93 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.

2.01 s

Page Load Progression

495 ms
989 ms
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
17
11 PASS 3 REVIEW 1 FIX
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
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Info::
All images are well-optimized
21 images 180 KB
0 oversized -0 KB
21 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
539ms total JS execution
REVIEW
539ms total JS execution
Info::
https://jcp.org/en/home/index: 193ms CPU time
Info::
https://s.go-mpulse.net/boomerang/UE9G5-FVEGY-MA38...: 175ms CPU time
Info::
Unattributable: 171ms CPU time
Warning::
Third-party scripts: 346ms (64% of total)

Main Thread Breakdown

Other 42% Script Evaluation 29% Style & Layout 12% Rendering 10% Script Parsing & Compilation 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://jcp.org/en/home/index193ms31ms3ms1st
https://s.go-mpulse.net/boomerang/UE9G5-FVEGY-MA38N-LMMNY-SBQP2175ms100ms22ms3rd
Unattributable171ms5ms0ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
260 KB transferred, 33 requests
PASS
260 KB transferred, 33 requests
Info::
Page weighs 436 KB (260 KB transferred)
Info::
33 HTTP requests
Info::
Estimated 0.05 g CO2 per page load
260 KB / 2.4 MB budget
260 KB transferred
33 requests
0.05 g CO2 per page load
Images 180.0 KiB 69%
JavaScript 62.2 KiB 24%
HTML 9.3 KiB 4%
CSS 5.1 KiB 2%
Other 2.0 KiB 1%
Other 871 B 0%
Other 220 B 0%
0 2.4 MB 4.9 MB
Under budget
A
Third-Party Impact
22% third-party, 0 ms blocking
PASS
22% third-party, 0 ms blocking
Info::
Third-party code accounts for 22% of page weight (57.9 KiB of 259.5 KiB)
Info::
Third-party blocking time is low (0 ms)
78%
22%
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
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
3 scripts, 27 KB unused
PASS
3 scripts, 27 KB unused
Warning::
https://s.go-mpulse.net/boomerang/UE9G5-FVEGY-MA38...: 27 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 27 KB
27 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://s.go-mpulse.net/boomerang/UE9G5-FVEGY-MA38N-LMMNY-SBQP257 KB27 KB (47%)✓3rd
https://jcp.org/includes/scripts/tabs.js2 KB—✓1st
https://jcp.org/includes/scripts/menu.js3 KB—✓1st

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+
Page Weight Inventory
33 resources · 260 KB · 27 KB savings available
PASS
33 resources · 260 KB · 27 KB savings available
Info::
Within 1MB page-weight target
Got: 260 KB
Info::
3 third-party resources (22% of weight)
33 resources · 259.5 KiB · 3 third-party Within 1MB page-weight target
Image 70% · 181.1 KiB
JavaScript 24% · 62.2 KiB
Document 4% · 10.3 KiB
CSS 2% · 5.1 KiB
Other 0% · 871 B

~26.6 KiB of savings available

Remove unused JavaScript: 26.6 KiB
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
33 requests over 4235ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.0 s LCP 2.0 shttps://jcp.org// https://jcp.org/ — 302 — 1.1 KiB — 1.5 s — h2http://jcp.org/en/home/index/en/home/index http://jcp.org/en/home/index — 307 — 0 B — 1 ms — http/1.1https://jcp.org/en/home/index/en/home/index https://jcp.org/en/home/index — 200 — 9.3 KiB — 319 ms — h2https://jcp.org/includes/css/menu.css/includes/css/menu.css https://jcp.org/includes/css/menu.css — 200 — 1.2 KiB — 1.1 s — h2https://jcp.org/includes/css/style.css/includes/css/style.css https://jcp.org/includes/css/style.css — 200 — 2.6 KiB — 803 ms — h2https://jcp.org/includes/css/tabs.css/includes/css/tabs.css https://jcp.org/includes/css/tabs.css — 200 — 1.3 KiB — 722 ms — h2https://jcp.org/includes/scripts/tabs.js/includes/scripts/tabs.js https://jcp.org/includes/scripts/tabs.js — 200 — 2.0 KiB — 737 ms — h2https://jcp.org/includes/scripts/menu.js/includes/scripts/menu.js https://jcp.org/includes/scripts/menu.js — 200 — 3.3 KiB — 909 ms — h2https://jcp.org/images/spacer.gif/images/spacer.gif https://jcp.org/images/spacer.gif — 200 — 627 B — 755 ms — h2https://jcp.org/images/ad_banner2.gif/images/ad_banner2.gif https://jcp.org/images/ad_banner2.gif — 200 — 4.1 KiB — 724 ms — h2https://jcp.org/images/global/spacer.gif/images/global/spacer.gif https://jcp.org/images/global/spacer.gif — 200 — 625 B — 197 ms — h2https://jcp.org/images/Facebook_Logo_Primary.png/images/Facebook_Logo_Primary.png https://jcp.org/images/Facebook_Logo_Primary.png — 200 — 54.1 KiB — 750 ms — h2https://jcp.org/images/logo-black.png/images/logo-black.png https://jcp.org/images/logo-black.png — 200 — 100.6 KiB — 740 ms — h2https://s.go-mpulse.net/boomerang/UE9G5-FVEGY-MA38N-LMMNY-SBQP2s.go-mpulse.net/boomerang/UE9G5-FVE... https://s.go-mpulse.net/boomerang/UE9G5-FVEGY-MA38N-LMMNY-SBQP2 — 200 — 56.8 KiB — 69 ms — h2https://jcp.org/images/button_go.gif/images/button_go.gif https://jcp.org/images/button_go.gif — 200 — 956 B — 198 ms — h2https://jcp.org/images/hr_dots1.gif/images/hr_dots1.gif https://jcp.org/images/hr_dots1.gif — 200 — 648 B — 665 ms — h2https://jcp.org/images/hd_find-jsrs.gif/images/hd_find-jsrs.gif https://jcp.org/images/hd_find-jsrs.gif — 200 — 1.0 KiB — 843 ms — h2https://jcp.org/images/hd_my-jcp.gif/images/hd_my-jcp.gif https://jcp.org/images/hd_my-jcp.gif — 200 — 1.1 KiB — 214 ms — h2https://jcp.org/images/hd_jcp-info.gif/images/hd_jcp-info.gif https://jcp.org/images/hd_jcp-info.gif — 200 — 1.1 KiB — 820 ms — h2https://jcp.org/images/common/trans.gif/images/common/trans.gif https://jcp.org/images/common/trans.gif — 200 — 633 B — 809 ms — h2https://jcp.org/images/global/bar_green.gif/images/global/bar_green.gif https://jcp.org/images/global/bar_green.gif — 200 — 630 B — 891 ms — h2https://jcp.org/images/global/hd_quick-links.gif/images/global/hd_quick-links.gif https://jcp.org/images/global/hd_quick-links.gif — 200 — 1.1 KiB — 735 ms — h2https://jcp.org/images/global/hd_news.gif/images/global/hd_news.gif https://jcp.org/images/global/hd_news.gif — 200 — 1.0 KiB — 192 ms — h2https://jcp.org/images/global/hr_dots1.gif/images/global/hr_dots1.gif https://jcp.org/images/global/hr_dots1.gif — 200 — 676 B — 675 ms — h2https://jcp.org/images/common/logo_oracle_footer.gif/images/common/logo_oracle_footer.g... https://jcp.org/images/common/logo_oracle_footer.gif — 200 — 1.1 KiB — 205 ms — h2https://jcp.org/images/logo2.gif/images/logo2.gif https://jcp.org/images/logo2.gif — 200 — 6.9 KiB — 193 ms — h2https://jcp.org/images/nav-arrow.gif/images/nav-arrow.gif https://jcp.org/images/nav-arrow.gif — 200 — 637 B — 740 ms — h2https://jcp.org/images/arrow_submenus.gif/images/arrow_submenus.gif https://jcp.org/images/arrow_submenus.gif — 200 — 663 B — 745 ms — h2https://jcp.org/images/dots.gif/images/dots.gif https://jcp.org/images/dots.gif — 200 — 652 B — 1.1 s — h2https://jcp.org/images/bar_bot.gif/images/bar_bot.gif https://jcp.org/images/bar_bot.gif — 200 — 1.3 KiB — 812 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.0 s LCP 2.0 shttps://jcp.org// https://jcp.org/ — 302 — 1.1 KiB — 1.5 s — h2http://jcp.org/en/home/index/en/home/index http://jcp.org/en/home/index — 307 — 0 B — 1 ms — http/1.1https://jcp.org/en/home/index/en/home/index https://jcp.org/en/home/index — 200 — 9.3 KiB — 319 ms — h2https://jcp.org/includes/css/menu.css/includes/css/menu.css https://jcp.org/includes/css/menu.css — 200 — 1.2 KiB — 1.1 s — h2https://jcp.org/includes/css/style.css/includes/css/style.css https://jcp.org/includes/css/style.css — 200 — 2.6 KiB — 803 ms — h2https://jcp.org/includes/css/tabs.css/includes/css/tabs.css https://jcp.org/includes/css/tabs.css — 200 — 1.3 KiB — 722 ms — h2https://jcp.org/includes/scripts/tabs.js/includes/scripts/tabs.js https://jcp.org/includes/scripts/tabs.js — 200 — 2.0 KiB — 737 ms — h2https://jcp.org/includes/scripts/menu.js/includes/scripts/menu.js https://jcp.org/includes/scripts/menu.js — 200 — 3.3 KiB — 909 ms — h2https://jcp.org/images/spacer.gif/images/spacer.gif https://jcp.org/images/spacer.gif — 200 — 627 B — 755 ms — h2https://jcp.org/images/ad_banner2.gif/images/ad_banner2.gif https://jcp.org/images/ad_banner2.gif — 200 — 4.1 KiB — 724 ms — h2https://jcp.org/images/global/spacer.gif/images/global/spacer.gif https://jcp.org/images/global/spacer.gif — 200 — 625 B — 197 ms — h2https://jcp.org/images/Facebook_Logo_Primary.png/images/Facebook_Logo_Primary.png https://jcp.org/images/Facebook_Logo_Primary.png — 200 — 54.1 KiB — 750 ms — h2https://jcp.org/images/logo-black.png/images/logo-black.png https://jcp.org/images/logo-black.png — 200 — 100.6 KiB — 740 ms — h2https://s.go-mpulse.net/boomerang/UE9G5-FVEGY-MA38N-LMMNY-SBQP2s.go-mpulse.net/boomerang/UE9G5-FVE... https://s.go-mpulse.net/boomerang/UE9G5-FVEGY-MA38N-LMMNY-SBQP2 — 200 — 56.8 KiB — 69 ms — h2https://jcp.org/images/button_go.gif/images/button_go.gif https://jcp.org/images/button_go.gif — 200 — 956 B — 198 ms — h2https://jcp.org/images/hr_dots1.gif/images/hr_dots1.gif https://jcp.org/images/hr_dots1.gif — 200 — 648 B — 665 ms — h2https://jcp.org/images/hd_find-jsrs.gif/images/hd_find-jsrs.gif https://jcp.org/images/hd_find-jsrs.gif — 200 — 1.0 KiB — 843 ms — h2https://jcp.org/images/hd_my-jcp.gif/images/hd_my-jcp.gif https://jcp.org/images/hd_my-jcp.gif — 200 — 1.1 KiB — 214 ms — h2https://jcp.org/images/hd_jcp-info.gif/images/hd_jcp-info.gif https://jcp.org/images/hd_jcp-info.gif — 200 — 1.1 KiB — 820 ms — h2https://jcp.org/images/common/trans.gif/images/common/trans.gif https://jcp.org/images/common/trans.gif — 200 — 633 B — 809 ms — h2https://jcp.org/images/global/bar_green.gif/images/global/bar_green.gif https://jcp.org/images/global/bar_green.gif — 200 — 630 B — 891 ms — h2https://jcp.org/images/global/hd_quick-links.gif/images/global/hd_quick-links.gif https://jcp.org/images/global/hd_quick-links.gif — 200 — 1.1 KiB — 735 ms — h2https://jcp.org/images/global/hd_news.gif/images/global/hd_news.gif https://jcp.org/images/global/hd_news.gif — 200 — 1.0 KiB — 192 ms — h2https://jcp.org/images/global/hr_dots1.gif/images/global/hr_dots1.gif https://jcp.org/images/global/hr_dots1.gif — 200 — 676 B — 675 ms — h2https://jcp.org/images/common/logo_oracle_footer.gif/images/common/logo_oracle_footer.g... https://jcp.org/images/common/logo_oracle_footer.gif — 200 — 1.1 KiB — 205 ms — h2https://jcp.org/images/logo2.gif/images/logo2.gif https://jcp.org/images/logo2.gif — 200 — 6.9 KiB — 193 ms — h2https://jcp.org/images/nav-arrow.gif/images/nav-arrow.gif https://jcp.org/images/nav-arrow.gif — 200 — 637 B — 740 ms — h2https://jcp.org/images/arrow_submenus.gif/images/arrow_submenus.gif https://jcp.org/images/arrow_submenus.gif — 200 — 663 B — 745 ms — h2https://jcp.org/images/dots.gif/images/dots.gif https://jcp.org/images/dots.gif — 200 — 652 B — 1.1 s — h2https://jcp.org/images/bar_bot.gif/images/bar_bot.gif https://jcp.org/images/bar_bot.gif — 200 — 1.3 KiB — 812 ms — h2https://c.go-mpulse.net/api/config.json?key=UE9G5-FVEGY-MA38N-LMMNY-SBQP2&d=jcp.org&t=5922972&v=1.720.0&if=&sl=0&si=c9f72844-3f02-4fae-9c2c-46b3582b76be-tdwydq&plugins=AK,ConfigOverride,Continuity,PageParams,IFrameDelay,AutoXHR,SPA,History,Angular,Backbone,Ember,RT,CrossDomain,BW,PaintTiming,NavigationTiming,ResourceTiming,Memory,CACHE_RELOAD,Errors,TPAnalytics,UserTiming,Akamai,Early,EventTiming,LOGN&acao=&ak.ai=695954c.go-mpulse.net/api/config.json?key... https://c.go-mpulse.net/api/config.json?key=UE9G5-FVEGY-MA38N-LMMNY-SBQP2&d=jcp.org&t=5922972&v=1.720.0&if=&sl=0&si=c9f72844-3f02-4fae-9c2c-46b3582b76be-tdwydq&plugins=AK,ConfigOverride,Continuity,PageParams,IFrameDelay,AutoXHR,SPA,History,Angular,Backbone,Ember,RT,CrossDomain,BW,PaintTiming,NavigationTiming,ResourceTiming,Memory,CACHE_RELOAD,Errors,TPAnalytics,UserTiming,Akamai,Early,EventTiming,LOGN&acao=&ak.ai=695954 — 200 — 871 B — 265 ms — h2https://jcp.org/favicon.ico/favicon.ico https://jcp.org/favicon.ico — 200 — 948 B — 26 ms — h2https://684dd326.akstat.io/684dd326.akstat.io/ https://684dd326.akstat.io/ — 204 — 220 B — 278 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
64% of JavaScript execution is third-party
First-party Third-party 346ms · 57KB · $5/mo
s.go-mpulse.net
Other
Optional
Execution 175ms
Transfer 57 KB
Unused 47%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 171ms
Transfer 0 KB
Monthly Cost $2/mo

64% 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

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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