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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
2
REVIEW
3
PASS
10
INFO
2

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

Mobile Desktop
88
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
74
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

2.37 s

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

3.13 s

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

3 ms

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

0.089

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

2.64 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.

4.08 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
10 PASS 3 REVIEW 2 FIX
D
Third-Party Impact
Action
65% third-party, 0 ms blocking
FIX
65% third-party, 0 ms blocking
Warning::
Third-party code accounts for 65% of page weight (213.9 KiB of 329.5 KiB)
Info::
Third-party blocking time is low (0 ms)
35%
65%
First-party Third-party
D
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.
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
8 images, 0 KB saveable
REVIEW
8 images, 0 KB saveable
Warning::
https://static.fc2.com/fc2com/img/smartphone/ml/bl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
8 images 179 KB
0 oversized -0 KB
8 legacy format
1 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

B
JS Bundles
10 scripts, 50 KB unused
REVIEW
10 scripts, 50 KB unused
Warning::
https://fc2.com/js/jquery-3.7.1.min.js: 50 KB unused (59%)
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://fc2.com/js/jquery-3.7.1.min.js86 KB50 KB (59%)✓1st
https://static.fc2.com/fc2com/js/viewport_320.js0 KB—✓3rd
https://static.fc2.com/share/fc2parts/js/common_design.js2 KB—✓3rd
https://static.fc2.com/fc2com/js/serviceicon_sp_ml.js?13012219301 KB—✓3rd
https://static.fc2.com/fc2com/js/agent_disc_sp.js?13012811191 KB—✓3rd
https://static.fc2.com/fc2com/js/login_top_disc_sp.js?13013117091 KB—✓3rd
https://fc2.com/en/notice_sp.js1 KB—✓1st
https://gdpr.fc2.com/share/js/gdpr/pp_agreement.sp.en.20180518.js2 KB—✓3rd
https://fc2.com/fc2dc/footer_sp.js2 KB—✓1st
https://www.google-analytics.com/analytics.js21 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
330 KB transferred, 26 requests
PASS
330 KB transferred, 26 requests
Info::
Page weighs 401 KB (330 KB transferred)
Info::
26 HTTP requests
Info::
Estimated 0.07 g CO2 per page load
330 KB / 2.4 MB budget
330 KB transferred
26 requests
0.07 g CO2 per page load
Images 179.5 KiB 54%
JavaScript 116.9 KiB 35%
HTML 24.8 KiB 8%
CSS 6.3 KiB 2%
Other 1.3 KiB 0%
Other 660 B 0%
0 2.4 MB 4.9 MB
Under budget
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+
JS Execution Cost
430ms total JS execution
PASS
430ms total JS execution
Info::
Unattributable: 171ms CPU time
Info::
https://fc2.com/: 140ms CPU time
Info::
https://www.google-analytics.com/analytics.js: 61ms CPU time
Info::
https://fc2.com/js/jquery-3.7.1.min.js: 58ms CPU time
Warning::
Third-party scripts: 232ms (54% of total)

Main Thread Breakdown

Other 41% Script Evaluation 27% Style & Layout 17% Rendering 7% Parse HTML & CSS 4% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
Unattributable171ms5ms0ms3rd
https://fc2.com/140ms8ms2ms1st
https://www.google-analytics.com/analytics.js61ms51ms5ms3rd
https://fc2.com/js/jquery-3.7.1.min.js58ms46ms7ms1st
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+
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
26 resources · 330 KB · 50 KB savings available
PASS
26 resources · 330 KB · 50 KB savings available
Info::
Within 1MB page-weight target
Got: 330 KB
Info::
~50 KB of savings available
Warning::
19 third-party resources (65% of weight)
26 resources · 329.5 KiB · 19 third-party Within 1MB page-weight target
Image 55% · 180.8 KiB
JavaScript 35% · 116.9 KiB
Document 8% · 25.0 KiB
CSS 2% · 6.3 KiB
Other 0% · 446 B

~50.4 KiB of savings available

Remove unused JavaScript: 50.4 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
26 requests over 1306ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.4 s LCP 3.1 shttps://fc2.com// https://fc2.com/ — 200 — 4.0 KiB — 480 ms — h2https://static.fc2.com/fc2com/css/smartphone/common_ml.css?1501081500static.fc2.com/fc2com/css/smartphon... https://static.fc2.com/fc2com/css/smartphone/common_ml.css?1501081500 — 200 — 3.0 KiB — 93 ms — h2https://fc2.com/js/jquery-3.7.1.min.js/js/jquery-3.7.1.min.js https://fc2.com/js/jquery-3.7.1.min.js — 200 — 85.8 KiB — 471 ms — h2https://static.fc2.com/fc2com/js/viewport_320.jsstatic.fc2.com/fc2com/js/viewport_3... https://static.fc2.com/fc2com/js/viewport_320.js — 200 — 492 B — 94 ms — h2https://static.fc2.com/share/fc2parts/js/common_design.jsstatic.fc2.com/share/fc2parts/js/co... https://static.fc2.com/share/fc2parts/js/common_design.js — 200 — 1.8 KiB — 89 ms — h2https://static.fc2.com/fc2com/css/smartphone/top_ml.css?1604081200static.fc2.com/fc2com/css/smartphon... https://static.fc2.com/fc2com/css/smartphone/top_ml.css?1604081200 — 200 — 2.3 KiB — 93 ms — h2https://static.fc2.com/fc2com/js/serviceicon_sp_ml.js?1301221930static.fc2.com/fc2com/js/serviceico... https://static.fc2.com/fc2com/js/serviceicon_sp_ml.js?1301221930 — 200 — 673 B — 96 ms — h2https://static.fc2.com/fc2com/js/agent_disc_sp.js?1301281119static.fc2.com/fc2com/js/agent_disc... https://static.fc2.com/fc2com/js/agent_disc_sp.js?1301281119 — 200 — 745 B — 121 ms — h2https://static.fc2.com/fc2com/js/login_top_disc_sp.js?1301311709static.fc2.com/fc2com/js/login_top_... https://static.fc2.com/fc2com/js/login_top_disc_sp.js?1301311709 — 200 — 870 B — 94 ms — h2https://fc2.com/en/notice_sp.js/en/notice_sp.js https://fc2.com/en/notice_sp.js — 200 — 1.3 KiB — 470 ms — h2https://static.fc2.com/fc2com/img/smartphone/ml/blank.gifstatic.fc2.com/fc2com/img/smartphon... https://static.fc2.com/fc2com/img/smartphone/ml/blank.gif — 200 — 395 B — 19 ms — h2https://gdpr.fc2.com/share/js/gdpr/pp_agreement.sp.en.20180518.jsgdpr.fc2.com/share/js/gdpr/pp_agree... https://gdpr.fc2.com/share/js/gdpr/pp_agreement.sp.en.20180518.js — 200 — 2.3 KiB — 510 ms — http/1.1https://fc2.com/fc2dc/footer_sp.js/fc2dc/footer_sp.js https://fc2.com/fc2dc/footer_sp.js — 200 — 2.2 KiB — 158 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 115 ms — h2https://static.fc2.com/fc2com/img/smartphone/ml/bg.pngstatic.fc2.com/fc2com/img/smartphon... https://static.fc2.com/fc2com/img/smartphone/ml/bg.png — 200 — 5.7 KiB — 47 ms — h2https://static.fc2.com/fc2com/img/smartphone/ml/paturn.pngstatic.fc2.com/fc2com/img/smartphon... https://static.fc2.com/fc2com/img/smartphone/ml/paturn.png — 200 — 546 B — 23 ms — h2https://static.fc2.com/fc2com/img/smartphone/ml/icon_bg.png?1static.fc2.com/fc2com/img/smartphon... https://static.fc2.com/fc2com/img/smartphone/ml/icon_bg.png?1 — 200 — 87.9 KiB — 55 ms — h2https://static.fc2.com/fc2com/img/smartphone/ml/sprite.png?6static.fc2.com/fc2com/img/smartphon... https://static.fc2.com/fc2com/img/smartphone/ml/sprite.png?6 — 200 — 18.8 KiB — 26 ms — h2https://static.fc2.com/fc2com/img/smartphone/ml/service_icon_sp.pngstatic.fc2.com/fc2com/img/smartphon... https://static.fc2.com/fc2com/img/smartphone/ml/service_icon_sp.png — 200 — 46.6 KiB — 61 ms — h2https://static.fc2.com/fc2com/img/smartphone/ml/tri_gray.pngstatic.fc2.com/fc2com/img/smartphon... https://static.fc2.com/fc2com/img/smartphone/ml/tri_gray.png — 200 — 801 B — 60 ms — h2https://static.fc2.com/fc2com/img/smartphone/ml/sprite.png?7static.fc2.com/fc2com/img/smartphon... https://static.fc2.com/fc2com/img/smartphone/ml/sprite.png?7 — 200 — 18.8 KiB — 62 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=541774254&t=pageview&_s=1&dl=https%3A%2F%2Ffc2.com%2F&ul=en-us&dt=FC2%20-%20Free%20Website%2C%20Analyzer%2C%20Blog%2C%20Rental%20Server%2C%20SEO%20Countermeasures%2C%20etc.%20-&sr=412x823&vp=320x639&_u=IEBAAEABAAAAACAAI~&jid=515002059&gjid=303342164&cid=1835240859.1776799058&tid=UA-12020025-18&_gid=1535318883.1776799058&_r=1&_slc=1&z=1238844702www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=541774254&t=pageview&_s=1&dl=https%3A%2F%2Ffc2.com%2F&ul=en-us&dt=FC2%20-%20Free%20Website%2C%20Analyzer%2C%20Blog%2C%20Rental%20Server%2C%20SEO%20Countermeasures%2C%20etc.%20-&sr=412x823&vp=320x639&_u=IEBAAEABAAAAACAAI~&jid=515002059&gjid=303342164&cid=1835240859.1776799058&tid=UA-12020025-18&_gid=1535318883.1776799058&_r=1&_slc=1&z=1238844702 — 200 — 446 B — 25 ms — h2https://static.fc2.com/share/css/gdpr/sp/CoZ9Nu8Z.min.cssstatic.fc2.com/share/css/gdpr/sp/Co... https://static.fc2.com/share/css/gdpr/sp/CoZ9Nu8Z.min.css — 200 — 1.0 KiB — 18 ms — h2https://fc2.com/logincheck.php?6367714/logincheck.php?6367714 https://fc2.com/logincheck.php?6367714 — 200 — 214 B — 160 ms — h2https://fc2.com/favicon.ico/favicon.ico https://fc2.com/favicon.ico — 200 — 1.3 KiB — 161 ms — h2https://fc2.com/fc2dc/footer_sp.html/fc2dc/footer_sp.html https://fc2.com/fc2dc/footer_sp.html — 200 — 20.8 KiB — 158 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
54% of JavaScript execution is third-party
First-party Third-party 232ms · 21KB · $3/mo
Unattributable
Other
Optional
Execution 171ms
Transfer 0 KB
Monthly Cost $2/mo
Google Analytics
Analytics
Optional
Execution 61ms
Transfer 21 KB
Monthly Cost $1/mo

54% 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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