https://tarotai.chat
Performance
· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
83
GRADE
B
FIX
3
REVIEW
5
PASS
15
INFO
4
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
36
96
96
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
4.05 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.85 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.62 s
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.
5.93 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.
11.56 s
Page Load Progression
646 ms 1.3 s 1.9 s
2.6 s
3.2 s
3.9 s 4.5 s
5.2 sChecks
2715 PASS 5 REVIEW 3 FIX
FPage Weight BudgetAction11.1 MB transferred, 167 requestsFIX
Page Weight Budget
Action11.1 MB transferred, 167 requests
11.1 MB transferred, 167 requests
Critical::
Page weighs 13.4 MB (11.1 MB transferred)
Warning::
Images are 9.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 9.8 MB
Warning::
JavaScript is 645 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 645 KB
Info::
Fonts are 487 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 487 KB
Warning::
167 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.3 g CO2 per page load
11.1 MB transferred
167 requests
2.3 g CO2 per page load
Images 9.8 MiB 88%
JavaScript 644.9 KiB 6%
Fonts 487.2 KiB 4%
CSS 139.4 KiB 1%
HTML 31.4 KiB 0%
Other 4.0 KiB 0%
Other 2.7 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Why this matters
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Why this matters
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
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
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
FJS Execution CostAction9594ms total JS executionFIX
JS Execution Cost
Action9594ms total JS execution
9594ms total JS execution
Warning::
https://tarotai.chat/assets/chatarot-landing-Dfs5c...: 3872ms CPU time
Warning::
https://tarotai.chat/assets/framework-DJH1pfSr.js: 2499ms CPU time
Warning::
Unattributable: 1903ms CPU time
Warning::
https://tarotai.chat/assets/three.module-UEBaNSRS....: 685ms CPU time
Warning::
https://tarotai.chat/: 552ms CPU time
Info::
Third-party scripts: 82ms (1% of total)
Main Thread Breakdown
Other 68% Script Evaluation 24% Style & Layout 4%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://tarotai.chat/assets/chatarot-landing-Dfs5cQfN.js | 3872ms | 1165ms | 1ms | 1st |
| https://tarotai.chat/assets/framework-DJH1pfSr.js | 2499ms | 317ms | 0ms | 1st |
| Unattributable | 1903ms | 108ms | 0ms | 1st |
| https://tarotai.chat/assets/three.module-UEBaNSRS.js | 685ms | 660ms | 1ms | 1st |
| https://tarotai.chat/ | 552ms | 29ms | 13ms | 1st |
| https://accounts.google.com/gsi/client | 82ms | 60ms | 22ms | 3rd |
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: no-store, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
no-store, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| no-store | — | Never cache this response |
| must-revalidate | — | Must recheck with server after expiry |
BImage Optimization88 images, 0 KB saveableREVIEW
Image Optimization
88 images, 0 KB saveable
88 images, 0 KB saveable
Info::
All images are well-optimized
88 images 9.8 MB
0 oversized -0 KB
80 legacy format
0 missing dimensions CLS risk
CJS BundlesAction38 scripts, 260 KB unusedREVIEW
JS Bundles
Action38 scripts, 260 KB unused
38 scripts, 260 KB unused
Warning::
https://tarotai.chat/assets/three.module-UEBaNSRS....: 100 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 75 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tarotai.chat/assets/chatarot-landing-Dfs5c...: 32 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tarotai.chat/assets/bottom-chrome-DXfCLf2W...: 29 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tarotai.chat/assets/markdown-it-BVcQdzKk.j...: 24 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 260 KB
260 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://tarotai.chat/assets/three.module-UEBaNSRS.js | 186 KB | 100 KB (54%) | ✓ | 1st |
| https://accounts.google.com/gsi/client | 99 KB | 75 KB (76%) | ✓ | 3rd |
| https://tarotai.chat/assets/chatarot-landing-Dfs5cQfN.js | 61 KB | 32 KB (53%) | ✓ | 1st |
| https://tarotai.chat/assets/bottom-chrome-DXfCLf2W.js | 48 KB | 29 KB (69%) | ✓ | 1st |
| https://tarotai.chat/assets/markdown-it-BVcQdzKk.js | 46 KB | 24 KB (60%) | ✓ | 1st |
| https://tarotai.chat/assets/react-client-CAjdHkmk.js | 0 KB | — | ✓ | 1st |
| https://tarotai.chat/assets/NextIntlClientProvider-d9oaY35C.js | 0 KB | — | ✓ | 1st |
| https://tarotai.chat/assets/BaseLink-ChC4aoCQ.js | 6 KB | — | ✓ | 1st |
| https://tarotai.chat/assets/locale-CIUEaCla.js | 2 KB | — | ✓ | 1st |
| https://tarotai.chat/assets/global-error-CVl8f3Cz.js | 1 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
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
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.
CPage Weight InventoryAction167 resources · 11.1 MB · 260 KB savings availableREVIEW
Page Weight Inventory
Action167 resources · 11.1 MB · 260 KB savings available
167 resources · 11.1 MB · 260 KB savings available
Warning::
Page weight 11.1 MB exceeds 1 MB target by 10.1 MB
Got: 11.1 MB Expected: ≤ 1 MB
Info::
~260 KB of savings available
Info::
5 third-party resources (1% of weight)
Info::
1 resources over 200KB
167 resources · 11.1 MiB · 5 third-party 10.1 MiB over 1MB target
Image 88% · 9.8 MiB
JavaScript 6% · 644.9 KiB
Font 4% · 487.2 KiB
CSS 1% · 139.4 KiB
Document 0% · 31.4 KiB
Other 0% · 4.0 KiB
~259.8 KiB of savings available
Remove unused JavaScript: 259.8 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 167 resources | 11.1 MiB | ||||||
BCSS Performance Depth2 CSS depth issue(s) detectedREVIEW
CSS Performance Depth
2 CSS depth issue(s) detected
2 CSS depth issue(s) detected
Warning::
10 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.
Warning::
5 `@font-face` rule(s) without `font-display` -- causes FOIT
An `@font-face` rule without `font-display` causes Flash of Invisible Text (FOIT): the browser hides the styled text for up to 3 seconds while the custom font downloads, then either swaps to fallback (Chrome / Firefox) or stays invisible (older Safari). Add `font-display: swap` (shows fallback immediately, swaps in the custom font when ready) or `font-display: optional` (uses fallback if the font isn't ready in 100ms; never causes visible swap). Either eliminates FOIT outright.
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 (104.0 KiB of 11.1 MiB)
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+Font Loading20 fonts (487 KB)PASS
Font Loading
20 fonts (487 KB)
20 fonts (487 KB)
Info::
20 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
20
487 KB total
Render-blocking
0
of 20
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
outfit-f37fa50e.woff2 woff2 swap
Size 15 KB
Load time 296 ms
Start 178 ms
Risk FOUT — text flashes from fallback to web font
outfit-c8e7a734.woff2 woff2 swap
Size 32 KB
Load time 296 ms
Start 178 ms
Risk FOUT — text flashes from fallback to web font
cormorant-garamond-7d0f... woff2 swap
Size 25 KB
Load time 300 ms
Start 178 ms
Risk FOUT — text flashes from fallback to web font
cormorant-garamond-bd3f... woff2 swap
Size 21 KB
Load time 300 ms
Start 178 ms
Risk FOUT — text flashes from fallback to web font
cormorant-garamond-5f81... woff2 swap
Size 12 KB
Load time 300 ms
Start 179 ms
Risk FOUT — text flashes from fallback to web font
cormorant-garamond-0365... woff2 swap
Size 34 KB
Load time 300 ms
Start 179 ms
Risk FOUT — text flashes from fallback to web font
cormorant-garamond-fe99... woff2 swap
Size 39 KB
Load time 298 ms
Start 181 ms
Risk FOUT — text flashes from fallback to web font
cormorant-garamond-dd44... woff2 swap
Size 23 KB
Load time 308 ms
Start 181 ms
Risk FOUT — text flashes from fallback to web font
cormorant-garamond-44d8... woff2 swap
Size 21 KB
Load time 308 ms
Start 181 ms
Risk FOUT — text flashes from fallback to web font
cormorant-garamond-7f5a... woff2 swap
Size 11 KB
Load time 307 ms
Start 183 ms
Risk FOUT — text flashes from fallback to web font
cormorant-garamond-2111... woff2 swap
Size 33 KB
Load time 307 ms
Start 183 ms
Risk FOUT — text flashes from fallback to web font
cormorant-garamond-e99b... woff2 swap
Size 37 KB
Load time 311 ms
Start 183 ms
Risk FOUT — text flashes from fallback to web font
playfair-display-711017... woff2 swap
Size 23 KB
Load time 242 ms
Start 185 ms
Risk FOUT — text flashes from fallback to web font
playfair-display-f690fa... woff2 swap
Size 10 KB
Load time 67 ms
Start 185 ms
Risk FOUT — text flashes from fallback to web font
playfair-display-a9bc00... woff2 swap
Size 23 KB
Load time 66 ms
Start 186 ms
Risk FOUT — text flashes from fallback to web font
playfair-display-ef5ca8... woff2 swap
Size 38 KB
Load time 242 ms
Start 186 ms
Risk FOUT — text flashes from fallback to web font
playfair-display-73961b... woff2 swap
Size 21 KB
Load time 201 ms
Start 186 ms
Risk FOUT — text flashes from fallback to web font
playfair-display-49e0be... woff2 swap
Size 9 KB
Load time 201 ms
Start 186 ms
Risk FOUT — text flashes from fallback to web font
playfair-display-f556cd... woff2 swap
Size 21 KB
Load time 241 ms
Start 187 ms
Risk FOUT — text flashes from fallback to web font
playfair-display-9deeae... woff2 swap
Size 38 KB
Load time 267 ms
Start 187 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 Hints23 hints, 0 missing preconnectsPASS
Resource Hints
23 hints, 0 missing preconnects
23 hints, 0 missing preconnects
Info::
Page uses 23 resource hint(s)
Current Resource Hints
preconnect—
preload
+13
23dns-prefetch—
prefetch—
23 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+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: no-store, must-revalidate
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, Accept, Next-Router-State-Tree, Next-Router-Prefetch, Next-Router-Segment-P...
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 9.6 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.
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 Waterfall167 requests over 4891msINFO
Network Waterfall
167 requests over 4891ms
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
1% of JavaScript execution is third-party
First-party Third-party 82ms · 99KB · €1/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
accounts.google.com accounts.google.com | Other | 82ms | 99 KB | 76% | €1/mo | Optional |
accounts.google.com
Other
Execution 82ms
Transfer 99 KB
Unused 76%
Monthly Cost €1/mo
76% of accounts.google.com's code is unused. The script may be loading features you don't use.
Why this matters
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
Image Optimization30 images, 321 KB total, 288 KB wastedINFO
Image Optimization
30 images, 321 KB total, 288 KB wasted
Image Optimization Audit
Total Images
30
Total Size
321 KB
Oversized
3
Wasted
288 KB
3 missing dimensions
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.