https://jisouw.com
Performance
· 28 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
88
GRADE
B
FIX
2
REVIEW
6
PASS
15
INFO
5
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
29
93
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
2.39 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.82 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.19 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.362
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.03 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.
11.26 s
Page Load Progression
660 ms
1.3 s
2.0 s
2.6 s 3.3 s 4.0 s 4.6 s
5.3 sChecks
2815 PASS 6 REVIEW 2 FIX
FJS Execution CostAction13607ms total JS executionFIX
JS Execution Cost
Action13607ms total JS execution
13607ms total JS execution
Warning::
https://jisouw.com/: 9406ms CPU time
Warning::
Unattributable: 1406ms CPU time
Warning::
https://jisouw.com/static/web/js/lib/web-sdk-v1.1....: 902ms CPU time
Warning::
https://jisouw.com/usr/themes/Mirages/js/mirages-h...: 525ms CPU time
Warning::
https://jisouw.com/usr/themes/Mirages/static/jquer...: 506ms CPU time
Info::
Third-party scripts: 533ms (4% of total)
Main Thread Breakdown
Other 44% Style & Layout 25% Script Evaluation 17% Rendering 10%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://jisouw.com/ | 9406ms | 53ms | 12ms | 1st |
| Unattributable | 1406ms | 221ms | 0ms | 1st |
| https://jisouw.com/static/web/js/lib/web-sdk-v1.1.8.js?v=2026090203 | 902ms | 743ms | 16ms | 1st |
| https://jisouw.com/usr/themes/Mirages/js/mirages-head-init.js?v=2026082901 | 525ms | 493ms | 4ms | 1st |
| https://jisouw.com/usr/themes/Mirages/static/jquery/2.2.4/jquery.min.js?v=2026061103 | 506ms | 79ms | 13ms | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-BWW62P1C2C | 444ms | 357ms | 80ms | 3rd |
| https://jisouw.com/usr/themes/Mirages/js/7.10.0/mirages.main.min.js?v=20260612b | 173ms | 74ms | 24ms | 1st |
| https://jisouw.com/static/web/js/web_tracker_v18.js?v=2026090203 | 157ms | 126ms | 11ms | 1st |
| https://static.cloudflareinsights.com/beacon.min.js/vce701823e78c4301a35b7e07294d87301792088814092 | 89ms | 71ms | 0ms | 3rd |
FHTTP CachingActionNo cache headersFIX
HTTP Caching
ActionNo cache headers
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.
BPage Weight Budget1.2 MB transferred, 104 requestsREVIEW
Page Weight Budget
1.2 MB transferred, 104 requests
1.2 MB transferred, 104 requests
Info::
Page weighs 3.1 MB (1.2 MB transferred)
Warning::
104 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.25 g CO2 per page load
1.2 MB transferred
104 requests
0.25 g CO2 per page load
JavaScript 467.8 KiB 39%
Other 442.5 KiB 36%
CSS 101.4 KiB 8%
Images 97.7 KiB 8%
Fonts 51.3 KiB 4%
HTML 29.5 KiB 2%
Other 21.9 KiB 2%
Other 435 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Why this matters
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
BThird-Party Impact52% third-party, 0 ms blockingREVIEW
Third-Party Impact
52% third-party, 0 ms blocking
52% third-party, 0 ms blocking
Warning::
Third-party code accounts for 52% of page weight (624.5 KiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
48%
52%
First-party Third-party
BImage Optimization17 images, 0 KB saveableREVIEW
Image Optimization
17 images, 0 KB saveable
17 images, 0 KB saveable
Info::
All images are well-optimized
17 images 98 KB
0 oversized -0 KB
14 legacy format
0 missing dimensions CLS risk
BJS Bundles27 scripts, 136 KB unusedREVIEW
JS Bundles
27 scripts, 136 KB unused
27 scripts, 136 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-BWW6...: 73 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://jisouw.com/usr/themes/Mirages/js/7.10.0/ss...: 37 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://jisouw.com/usr/themes/Mirages/js/7.10.0/mi...: 26 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 136 KB
136 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-BWW62P1C2C | 177 KB | 73 KB (42%) | ✓ | 3rd |
| https://jisouw.com/usr/themes/Mirages/js/7.10.0/ssp-core-v0.0.4-20260827.js?v=2026090702 | 47 KB | 37 KB (79%) | ✓ | 1st |
| https://jisouw.com/usr/themes/Mirages/js/7.10.0/mirages.main.min.js?v=20260612b | 49 KB | 26 KB (53%) | ✓ | 1st |
| https://jisouw.com/static/friendlinks/friend_visit.js?v=20260914 | 2 KB | — | ✓ | 1st |
| https://jisouw.com/static/web/js/tracking-extras.js?v=2026090501 | 3 KB | — | ✓ | 1st |
| https://jisouw.com/static/friendlinks/friend_application.js?v=2026091406 | 5 KB | — | ✓ | 1st |
| https://jisouw.com/static/friendlinks/friend_http.js?v=20260914 | 1 KB | — | ✓ | 1st |
| https://jisouw.com/static/js/masthead-search.js?v=20260824h | 4 KB | — | ✓ | 1st |
| https://jisouw.com/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js | 1 KB | — | ✓ | 1st |
| https://jisouw.com/static/web/js/lib/web-sdk-v1.1.8.js?v=2026090203 | 33 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
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
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
Main HTML Cache-Control
No Cache-Control header on main HTML response
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
BPage Weight Inventory104 resources · 1.2 MB · 136 KB savings availableREVIEW
Page Weight Inventory
104 resources · 1.2 MB · 136 KB savings available
104 resources · 1.2 MB · 136 KB savings available
Warning::
Page weight 1.2 MB exceeds 1 MB target by 189 KB
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~136 KB of savings available
Warning::
43 third-party resources (52% of weight)
104 resources · 1.2 MiB · 43 third-party 188.6 KiB over 1MB target
JavaScript 39% · 467.8 KiB
Other 37% · 442.9 KiB
Image 10% · 119.7 KiB
CSS 8% · 101.4 KiB
Font 4% · 51.3 KiB
Document 2% · 29.5 KiB
~136.3 KiB of savings available
Remove unused JavaScript: 136.3 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 104 resources | 1.2 MiB | ||||||
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Font Loading3 fonts (51 KB)PASS
Font Loading
3 fonts (51 KB)
3 fonts (51 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
3
51 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
400.woff2 woff2 swap
Size 17 KB
Load time 515 ms
Start 695 ms
Risk FOUT — text flashes from fallback to web font
300.woff2 woff2 swap
Size 17 KB
Load time 816 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
400i.woff2 woff2 swap
Size 18 KB
Load time 516 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
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+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource Hints1 hints, 0 missing preconnectsPASS
Resource Hints
1 hints, 0 missing preconnects
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)
Current Resource Hints
preconnect 1
preload—
dns-prefetch—
prefetch—
1 resource hints configured
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+Document CompressionDocument response uses brotliPASS
Document Compression
Document response uses brotli
Document response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+LCP Image PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Server-Timing Observability3 Server-Timing entries advertisedPASS
Server-Timing Observability
3 Server-Timing entries advertised
3 Server-Timing entries advertised
Info::
Server-Timing header advertises 3 timing entries
A+Server Response Intelligence2 server-response signal(s) detectedPASS
Server Response Intelligence
2 server-response signal(s) detected
2 server-response signal(s) detected
Info::
`Vary` header declared: Origin, Access-Control-Request-Method, Access-Control-Request-Headers
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
Render-Blocking Resources
No render-blocking resources detected
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+Third-Party ResourcesNo third-party resources detectedPASS
Third-Party Resources
No third-party resources detected
No third-party resources detected
AJavaScript Blocking1 JS blocking issue(s) detectedPASS
JavaScript Blocking
1 JS blocking issue(s) detected
1 JS blocking issue(s) detected
Warning::
Total JS execution time is 13.6 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
ACSS Performance Depth1 CSS depth issue(s) detectedPASS
CSS Performance Depth
1 CSS depth issue(s) detected
1 CSS depth issue(s) detected
Warning::
13 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Asset CompressionNo text asset hosts to measureINFO
Asset Compression
No text asset hosts to measure
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall104 requests over 18853msINFO
Network Waterfall
104 requests over 18853ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
4% of JavaScript execution is third-party
First-party Third-party 533ms · 187KB · ¥26/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 444ms | 177 KB | 42% | ¥22/mo | Costly |
static.cloudflareinsights.com static.cloudflareinsights.com | Other | 89ms | 10 KB | — | ¥4/mo | Optional |
Google Tag Manager
Tag Manager
Execution 444ms
Transfer 177 KB
Unused 42%
Monthly Cost ¥22/mo
static.cloudflareinsights.com
Other
Execution 89ms
Transfer 10 KB
Monthly Cost ¥4/mo
These scripts may cost more than they're worth
- Google Tag Manager adds 444ms and costs ~¥22/month
Google Tag Manager takes 444ms 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
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-09-23 — 2026-10-20)
LCP (p75)
2154 ms
79% good
INP (p75)
121 ms
92% good
CLS (p75)
0.150
69% good
FCP (p75)
1143 ms
TTFB (p75)
903 ms
Image Optimization32 images, 173 KB total, 0 KB wastedINFO
Image Optimization
32 images, 173 KB total, 0 KB wasted
Image Optimization Audit
Total Images
32
Total Size
173 KB
29 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.