https://ichingonline.pro
Performance
· 21 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
95
GRADE
A
FIX
1
REVIEW
2
PASS
16
INFO
2
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
91
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.
609 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.27 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.141
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
660 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
1.47 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
2116 PASS 2 REVIEW 1 FIX
DHTTP CachingActionno-store (uncacheable)FIX
HTTP Caching
Actionno-store (uncacheable)
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-cache, no-store, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
private, no-cache, no-store, max-age=0, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
| no-cache | — | Cache but always revalidate first |
| no-store | — | Never cache this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
CJS Execution CostAction1061ms total JS executionREVIEW
JS Execution Cost
Action1061ms total JS execution
1061ms total JS execution
Warning::
https://ichingonline.pro/: 560ms CPU time
Warning::
https://ichingonline.pro/_next/static/chunks/0d65c...: 366ms CPU time
Info::
Unattributable: 135ms CPU time
Main Thread Breakdown
Style & Layout 39% Script Evaluation 35% Other 14% Script Parsing & Compilation 5%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://ichingonline.pro/ | 560ms | 6ms | 18ms | 1st |
| https://ichingonline.pro/_next/static/chunks/0d65ce108889130a.js | 366ms | 340ms | 5ms | 1st |
| Unattributable | 135ms | 8ms | 0ms | 1st |
BJS Bundles28 scripts, 134 KB unusedREVIEW
JS Bundles
28 scripts, 134 KB unused
28 scripts, 134 KB unused
Warning::
https://ichingonline.pro/_next/static/chunks/60094...: 56 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ichingonline.pro/_next/static/chunks/7bfed...: 54 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ichingonline.pro/_next/static/chunks/0d65c...: 23 KB unused (33%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 134 KB
134 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://ichingonline.pro/_next/static/chunks/600943c9ad006790.js | 70 KB | 56 KB (81%) | ✓ | 1st |
| https://ichingonline.pro/_next/static/chunks/7bfed8026320cb89.js | 69 KB | 54 KB (84%) | ✓ | 1st |
| https://ichingonline.pro/_next/static/chunks/0d65ce108889130a.js | 71 KB | 23 KB (33%) | ✓ | 1st |
| https://ichingonline.pro/_next/static/chunks/e6458a5e2e9303c9.js | 11 KB | — | ✓ | 1st |
| https://ichingonline.pro/_next/static/chunks/d75700b837b0f69e.js | 7 KB | — | ✓ | 1st |
| https://ichingonline.pro/_next/static/chunks/turbopack-23477a1ed14466e6.js | 5 KB | — | ✓ | 1st |
| https://ichingonline.pro/_next/static/chunks/48da1cbbd4d1a93d.js | 1 KB | — | ✓ | 1st |
| https://ichingonline.pro/_next/static/chunks/e767791ab1bb9364.js | 8 KB | — | ✓ | 1st |
| https://ichingonline.pro/_next/static/chunks/8f865f3963f525d3.js | 3 KB | — | ✓ | 1st |
| https://ichingonline.pro/_next/static/chunks/2cb7259ed7329a69.js | 10 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
APage Weight Budget721 KB transferred, 59 requestsPASS
Page Weight Budget
721 KB transferred, 59 requests
721 KB transferred, 59 requests
Info::
Page weighs 2.2 MB (721 KB transferred)
Info::
59 HTTP requests
Info::
Estimated 0.15 g CO2 per page load
721 KB transferred
59 requests
0.15 g CO2 per page load
JavaScript 471.3 KiB 65%
Fonts 123.9 KiB 17%
Other 43.0 KiB 6%
HTML 41.9 KiB 6%
CSS 32.6 KiB 5%
Other 7.1 KiB 1%
Other 1.4 KiB 0%
Other 450 B 0%
0 2.4 MB 4.9 MB
Under budget
A+Third-Party Impact1% third-party, 0 ms blockingPASS
Third-Party Impact
1% third-party, 0 ms blocking
1% third-party, 0 ms blocking
Info::
Third-party code accounts for 1% of page weight (10.2 KiB of 721.5 KiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
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 OptimizationNo images on this pagePASS
Image Optimization
No images on this page
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+Font Loading4 fonts (124 KB)PASS
Font Loading
4 fonts (124 KB)
4 fonts (124 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
124 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
b4e85636e2ca4056-s.p.9e... woff2 swap
Size 36 KB
Load time 32 ms
Start 426 ms
Risk FOUT — text flashes from fallback to web font
dc6d2a64e9dbf3bc-s.p.4b... woff2 swap
Size 36 KB
Load time 31 ms
Start 432 ms
Risk FOUT — text flashes from fallback to web font
017d9bea37084d9b-s.p.a6... woff2 swap
Size 41 KB
Load time 44 ms
Start 741 ms
Risk FOUT — text flashes from fallback to web font
f1a9db6354730b0f-s.p.69... woff2 swap
Size 11 KB
Load time 31 ms
Start 742 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+Main HTML Cache-ControlMain HTML uses no-store -- correct for sensitive/dynamic contentPASS
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: private, no-cache, no-store, max-age=0, must-revalidate
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: rsc, next-router-state-tree, next-router-prefetch, next-router-segment-prefetch
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+Page Weight Inventory59 resources · 721 KB · 134 KB savings availablePASS
Page Weight Inventory
59 resources · 721 KB · 134 KB savings available
59 resources · 721 KB · 134 KB savings available
Info::
Within 1MB page-weight target
Got: 721 KB
Info::
~134 KB of savings available
Info::
1 third-party resources (1% of weight)
59 resources · 721.5 KiB · 1 third-party Within 1MB page-weight target
JavaScript 65% · 471.3 KiB
Font 17% · 123.9 KiB
Document 6% · 41.9 KiB
CSS 5% · 32.6 KiB
Other 4% · 27.9 KiB
Media 2% · 17.0 KiB
Image 1% · 7.1 KiB
~133.8 KiB of savings available
Remove unused JavaScript: 133.8 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 59 resources | 721.5 KiB | ||||||
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 Waterfall59 requests over 3974msINFO
Network Waterfall
59 requests over 3974ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.