https://osada.us
Performance
· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
91
GRADE
A
FIX
2
REVIEW
3
PASS
18
INFO
2
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
55
100
81
82
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
7.98 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
9.57 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
175 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.
7.98 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.
9.57 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 sChecks
2518 PASS 3 REVIEW 2 FIX
DThird-Party ImpactAction69% third-party, 0 ms blockingFIX
Third-Party Impact
Action69% third-party, 0 ms blocking
69% third-party, 0 ms blocking
Warning::
Third-party code accounts for 69% of page weight (821.7 KiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
31%
69%
First-party Third-party
DJS Execution CostAction2005ms total JS executionFIX
JS Execution Cost
Action2005ms total JS execution
2005ms total JS execution
Warning::
https://osada.us/: 896ms CPU time
Warning::
https://osada.us/cdn-cgi/challenge-platform/script...: 459ms CPU time
Warning::
Unattributable: 404ms CPU time
Info::
https://osada.us/assets/index-Dzkd7XY7.js: 169ms CPU time
Info::
https://fonts.googleapis.com/css2?family=Noto+Sans...: 78ms CPU time
Info::
Third-party scripts: 78ms (4% of total)
Main Thread Breakdown
Style & Layout 49% Script Evaluation 25% Other 21% Parse HTML & CSS 3%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://osada.us/ | 896ms | 39ms | 2ms | 1st |
| https://osada.us/cdn-cgi/challenge-platform/scripts/jsd/main.js | 459ms | 280ms | 3ms | 1st |
| Unattributable | 404ms | 10ms | 0ms | 1st |
| https://osada.us/assets/index-Dzkd7XY7.js | 169ms | 161ms | 4ms | 1st |
| https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;600;700&family=Noto+Serif+JP:wght@400;500;600;700;900&family=Space+Grotesk:wght@400;500;600;700&display=swap | 78ms | 0ms | 0ms | 3rd |
BPage Weight Budget1.2 MB transferred, 42 requestsREVIEW
Page Weight Budget
1.2 MB transferred, 42 requests
1.2 MB transferred, 42 requests
Info::
Page weighs 3.0 MB (1.2 MB transferred)
Info::
Fonts are 513 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 513 KB
Info::
CSS is 305 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 305 KB
Info::
42 HTTP requests
Info::
Estimated 0.24 g CO2 per page load
1.2 MB transferred
42 requests
0.24 g CO2 per page load
Fonts 513.1 KiB 43%
CSS 305.1 KiB 26%
Images 195.2 KiB 16%
JavaScript 171.3 KiB 14%
Other 7.6 KiB 1%
HTML 1.3 KiB 0%
Other 862 B 0%
Other 637 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
Subset fonts to include only used characters, or switch to system font stacks.
Why this matters
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Why this matters
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
BPage Weight Inventory42 resources · 1.2 MB · 23 KB savings availableREVIEW
Page Weight Inventory
42 resources · 1.2 MB · 23 KB savings available
42 resources · 1.2 MB · 23 KB savings available
Warning::
Page weight 1.2 MB exceeds 1 MB target by 171 KB
Got: 1.2 MB Expected: ≤ 1 MB
Warning::
29 third-party resources (69% of weight)
Info::
1 resources over 200KB
42 resources · 1.2 MiB · 29 third-party 171.2 KiB over 1MB target
Font 43% · 513.1 KiB
CSS 26% · 305.1 KiB
Image 17% · 202.2 KiB
JavaScript 14% · 171.3 KiB
Other 0% · 2.1 KiB
Document 0% · 1.3 KiB
~23.1 KiB of savings available
Remove unused JavaScript: 23.1 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 42 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+Image Optimization1 images, 0 KB saveablePASS
Image Optimization
1 images, 0 KB saveable
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 195 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+Font Loading25 fonts (513 KB)PASS
Font Loading
25 fonts (513 KB)
25 fonts (513 KB)
Info::
25 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
25
513 KB total
Render-blocking
0
of 25
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
xn7mYHs72GKoTvER4Gn3b5e... woff2 swap
Size 33 KB
Load time 14 ms
Start 559 ms
Risk FOUT — text flashes from fallback to web font
xn7mYHs72GKoTvER4Gn3b5e... woff2 swap
Size 21 KB
Load time 23 ms
Start 559 ms
Risk FOUT — text flashes from fallback to web font
V8mDoQDjQSkFtoMM3T6r8E7... woff2 swap
Size 22 KB
Load time 29 ms
Start 560 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 18 KB
Load time 60 ms
Start 560 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 12 KB
Load time 62 ms
Start 560 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 16 KB
Load time 58 ms
Start 560 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 15 KB
Load time 56 ms
Start 561 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 17 KB
Load time 53 ms
Start 561 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 15 KB
Load time 51 ms
Start 561 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 77 KB
Load time 77 ms
Start 561 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 14 KB
Load time 49 ms
Start 562 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 16 KB
Load time 47 ms
Start 562 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 17 KB
Load time 63 ms
Start 562 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 16 KB
Load time 45 ms
Start 562 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 17 KB
Load time 74 ms
Start 564 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 17 KB
Load time 71 ms
Start 564 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 15 KB
Load time 36 ms
Start 565 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 18 KB
Load time 40 ms
Start 565 ms
Risk FOUT — text flashes from fallback to web font
xn7mYHs72GKoTvER4Gn3b5e... woff2 swap
Size 24 KB
Load time 32 ms
Start 565 ms
Risk FOUT — text flashes from fallback to web font
xn7mYHs72GKoTvER4Gn3b5e... woff2 swap
Size 15 KB
Load time 38 ms
Start 566 ms
Risk FOUT — text flashes from fallback to web font
xn7mYHs72GKoTvER4Gn3b5e... woff2 swap
Size 20 KB
Load time 72 ms
Start 567 ms
Risk FOUT — text flashes from fallback to web font
xn7mYHs72GKoTvER4Gn3b5e... woff2 swap
Size 22 KB
Load time 73 ms
Start 567 ms
Risk FOUT — text flashes from fallback to web font
xn7mYHs72GKoTvER4Gn3b5e... woff2 swap
Size 20 KB
Load time 72 ms
Start 567 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 18 KB
Load time 61 ms
Start 568 ms
Risk FOUT — text flashes from fallback to web font
xn7mYHs72GKoTvER4Gn3b5e... woff2 swap
Size 19 KB
Load time 73 ms
Start 568 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+JS Bundles4 scripts, 23 KB unusedPASS
JS Bundles
4 scripts, 23 KB unused
4 scripts, 23 KB unused
Warning::
https://osada.us/assets/index-Dzkd7XY7.js: 23 KB unused (18%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 23 KB
23 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://osada.us/assets/index-Dzkd7XY7.js | 147 KB | 23 KB (18%) | ✓ | 1st |
| https://static.cloudflareinsights.com/beacon.min.js | 11 KB | — | ✓ | 3rd |
| https://osada.us/assets/workbox-window.prod.es5-BIl4cyR9.js | 3 KB | — | ✓ | 1st |
| https://osada.us/cdn-cgi/challenge-platform/h/g/scripts/jsd/825e783f7fae/main.js? | 11 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 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+Compression AlgorithmMain response uses brotliPASS
Compression Algorithm
Main response uses brotli
Main 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+Main HTML Cache-ControlMain HTML max-age=300 (≤ 5min) is appropriatePASS
Main HTML Cache-Control
Main HTML max-age=300 (≤ 5min) is appropriate
Main HTML max-age=300 (≤ 5min) is appropriate
Info::
Main HTML max-age=300 (≤ 5min) is appropriate
Got: public, max-age=300
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: accept-encoding
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
A+JavaScript BlockingNo render-blocking JS or document.write usage detectedPASS
JavaScript Blocking
No render-blocking JS or document.write usage detected
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
A+CSS Performance DepthNo CSS performance depth issues detectedPASS
CSS Performance Depth
No CSS performance depth issues detected
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
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
AHTTP Cachingmax-age=300 (5 minutes)PASS
HTTP Caching
max-age=300 (5 minutes)
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: public, max-age=300
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
public, max-age=300
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 300 | Cache for 5 minutes |
Effective TTL: 300 seconds
Network Waterfall42 requests over 869msINFO
Network Waterfall
42 requests over 869ms
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 78ms · 297KB · ¥107/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Fonts fonts.googleapis.com | Font | 78ms | 297 KB | — | ¥107/mo | Costly |
Google Fonts
Font
Execution 78ms
Transfer 297 KB
Monthly Cost ¥107/mo
These scripts may cost more than they're worth
- Google Fonts adds 78ms and costs ~¥107/month
Google Fonts takes 78ms 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
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.