https://jisouw.com
Performance
· 24 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
88
GRADE
B
FIX
2
REVIEW
5
PASS
12
INFO
5
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
86
96
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
690 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.12 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
48 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.103
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.38 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.
2.87 s
Page Load Progression
705 ms
1.4 s
2.1 s
2.8 s 3.5 s 4.2 s 4.9 s
5.6 sChecks
2412 PASS 5 REVIEW 2 FIX
DJS Execution CostAction2818ms total JS executionFIX
JS Execution Cost
Action2818ms total JS execution
2818ms total JS execution
Warning::
https://jisouw.com/: 2073ms CPU time
Warning::
Unattributable: 303ms CPU time
Info::
https://jisouw.com/static/web/js/lib/web-sdk-v1.1....: 200ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-BWW6...: 137ms CPU time
Info::
https://jisouw.com/usr/themes/Mirages/js/mirages-h...: 105ms CPU time
Info::
Third-party scripts: 137ms (5% of total)
Main Thread Breakdown
Other 48% Style & Layout 23% Script Evaluation 18% Rendering 7%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://jisouw.com/ | 2073ms | 14ms | 3ms | 1st |
| Unattributable | 303ms | 43ms | 0ms | 1st |
| https://jisouw.com/static/web/js/lib/web-sdk-v1.1.8.js?v=2026090203 | 200ms | 168ms | 4ms | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-BWW62P1C2C | 137ms | 107ms | 22ms | 3rd |
| https://jisouw.com/usr/themes/Mirages/js/mirages-head-init.js?v=2026082901 | 105ms | 96ms | 1ms | 1st |
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 Budget1.1 MB transferred, 103 requestsREVIEW
Page Weight Budget
1.1 MB transferred, 103 requests
1.1 MB transferred, 103 requests
Info::
Page weighs 2.9 MB (1.1 MB transferred)
Warning::
103 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.22 g CO2 per page load
1.1 MB transferred
103 requests
0.22 g CO2 per page load
JavaScript 467.8 KiB 43%
Other 353.6 KiB 33%
CSS 101.4 KiB 9%
Images 85.4 KiB 8%
HTML 29.5 KiB 3%
Other 22.0 KiB 2%
Fonts 17.0 KiB 2%
Other 436 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 Impact50% third-party, 0 ms blockingREVIEW
Third-Party Impact
50% third-party, 0 ms blocking
50% third-party, 0 ms blocking
Info::
Third-party code accounts for 50% of page weight (535.6 KiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
50%
50%
First-party Third-party
BImage Optimization22 images, 0 KB saveableREVIEW
Image Optimization
22 images, 0 KB saveable
22 images, 0 KB saveable
Info::
All images are well-optimized
22 images 85 KB
0 oversized -0 KB
19 legacy format
0 missing dimensions CLS risk
BJS Bundles27 scripts, 137 KB unusedREVIEW
JS Bundles
27 scripts, 137 KB unused
27 scripts, 137 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-BWW6...: 74 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...: 27 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 137 KB
137 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 | 74 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 | 27 KB (55%) | ✓ | 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.
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 Loading1 fonts (17 KB)PASS
Font Loading
1 fonts (17 KB)
1 fonts (17 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
1
17 KB total
Render-blocking
0
of 1
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 26 ms
Start 698 ms
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 HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
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.
APage Weight Inventory103 resources · 1.1 MB · 137 KB savings availablePASS
Page Weight Inventory
103 resources · 1.1 MB · 137 KB savings available
103 resources · 1.1 MB · 137 KB savings available
Warning::
Page weight 1.1 MB exceeds 1 MB target by 53 KB
Got: 1.1 MB Expected: ≤ 1 MB
Info::
~137 KB of savings available
Warning::
39 third-party resources (50% of weight)
103 resources · 1.1 MiB · 39 third-party 53.1 KiB over 1MB target
JavaScript 43% · 467.8 KiB
Other 33% · 354.0 KiB
Image 10% · 107.5 KiB
CSS 9% · 101.4 KiB
Document 3% · 29.5 KiB
Font 2% · 17.0 KiB
~137.4 KiB of savings available
Remove unused JavaScript: 137.4 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 103 resources | 1.1 MiB | ||||||
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 Waterfall103 requests over 8448msINFO
Network Waterfall
103 requests over 8448ms
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
5% of JavaScript execution is third-party
First-party Third-party 137ms · 177KB · ¥7/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 137ms | 177 KB | 42% | ¥7/mo | Optional |
Google Tag Manager
Tag Manager
Execution 137ms
Transfer 177 KB
Unused 42%
Monthly Cost ¥7/mo
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.