https://rewordsai.app
Performance
· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
92
GRADE
A
FIX
2
REVIEW
3
PASS
18
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
71
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.
3.40 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
5.00 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
102 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.
5.32 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.
6.33 s
Page Load Progression
592 ms 1.2 s 1.8 s
2.4 s
3.0 s 3.6 s 4.1 s
4.7 sChecks
2618 PASS 3 REVIEW 2 FIX
FJS Execution CostAction4941ms total JS executionFIX
JS Execution Cost
Action4941ms total JS execution
4941ms total JS execution
Warning::
https://rewordsai.app/assets/framework-DJH1pfSr.js: 2060ms CPU time
Warning::
https://rewordsai.app/: 1394ms CPU time
Warning::
https://rewordsai.app/assets/workspace-DFC36FZF.js: 798ms CPU time
Warning::
Unattributable: 523ms CPU time
Info::
https://accounts.google.com/gsi/client: 107ms CPU time
Info::
Third-party scripts: 167ms (3% of total)
Main Thread Breakdown
Script Evaluation 44% Other 26% Style & Layout 19% Rendering 6%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://rewordsai.app/assets/framework-DJH1pfSr.js | 2060ms | 1938ms | 1ms | 1st |
| https://rewordsai.app/ | 1394ms | 68ms | 65ms | 1st |
| https://rewordsai.app/assets/workspace-DFC36FZF.js | 798ms | 126ms | 0ms | 1st |
| Unattributable | 523ms | 52ms | 0ms | 1st |
| https://accounts.google.com/gsi/client | 107ms | 71ms | 36ms | 3rd |
| https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e1781791509496 | 60ms | 42ms | 5ms | 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 |
BJS Bundles87 scripts, 72 KB unusedREVIEW
JS Bundles
87 scripts, 72 KB unused
87 scripts, 72 KB unused
Warning::
https://accounts.google.com/gsi/client: 72 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 72 KB
72 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://accounts.google.com/gsi/client | 97 KB | 72 KB (75%) | ✓ | 3rd |
| https://rewordsai.app/assets/global-error-CVl8f3Cz.js | 1 KB | — | ✓ | 1st |
| https://rewordsai.app/assets/framework-DJH1pfSr.js | 60 KB | — | ✓ | 1st |
| https://rewordsai.app/assets/rolldown-runtime-QTnfLwEv.js | 1 KB | — | ✓ | 1st |
| https://rewordsai.app/assets/url-utils-BQKFb685.js | 1 KB | — | ✓ | 1st |
| https://rewordsai.app/assets/error-C4uIAfx6.js | 1 KB | — | ✓ | 1st |
| https://rewordsai.app/assets/navigation-IfqSW_4H.js | 1 KB | — | ✓ | 1st |
| https://rewordsai.app/assets/react-DlbkFqaW.js | 13 KB | — | ✓ | 1st |
| https://rewordsai.app/assets/BaseLink-DhOccf1O.js | 2 KB | — | ✓ | 1st |
| https://rewordsai.app/assets/link-CfIhK7YT.js | 4 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
BResource Hints9 hints, 0 missing preconnectsREVIEW
Resource Hints
9 hints, 0 missing preconnects
9 hints, 0 missing preconnects
Warning::
7 font preload(s) missing `crossorigin` -- font will be downloaded twice
Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: /assets/_vinext_fonts/inter-e43d3660ae4c/inter-7249155f.woff2, /assets/_vinext_fonts/inter-e43d3660ae4c/inter-e34c5f1b.woff2, /assets/_vinext_fonts/inter-e43d3660ae4c/inter-6e1a6b2b.woff2 (+4 more). Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
Info::
1 URL(s) appear in multiple hints
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: /images/hero-menu-before-360.webp (preload+preload).
Info::
Page uses 9 resource hint(s)
Current Resource Hints
preconnect—
preload 9
dns-prefetch—
prefetch—
9 resource hints configured
Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: /assets/_vinext_fonts/inter-e43d3660ae4c/inter-7249155f.woff2, /assets/_vinext_fonts/inter-e43d3660ae4c/inter-e34c5f1b.woff2, /assets/_vinext_fonts/inter-e43d3660ae4c/inter-6e1a6b2b.woff2 (+4 more). Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
Why this matters
Performance issues directly impact user engagement and conversion rates.
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: /images/hero-menu-before-360.webp (preload+preload).
Why this matters
Performance issues directly impact user engagement and conversion rates.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
APage Weight Budget850 KB transferred, 106 requestsPASS
Page Weight Budget
850 KB transferred, 106 requests
850 KB transferred, 106 requests
Info::
Page weighs 1.9 MB (850 KB transferred)
Info::
Fonts are 217 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 217 KB
Warning::
106 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.17 g CO2 per page load
850 KB transferred
106 requests
0.17 g CO2 per page load
JavaScript 397.3 KiB 47%
Fonts 217.2 KiB 26%
Images 138.2 KiB 16%
HTML 65.9 KiB 8%
CSS 28.3 KiB 3%
Other 2.0 KiB 0%
Other 1.1 KiB 0%
Other 455 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
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
A+Third-Party Impact13% third-party, 0 ms blockingPASS
Third-Party Impact
13% third-party, 0 ms blocking
13% third-party, 0 ms blocking
Info::
Third-party code accounts for 13% of page weight (108.8 KiB of 850.5 KiB)
Info::
Third-party blocking time is low (0 ms)
87%
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 Optimization4 images, 0 KB saveablePASS
Image Optimization
4 images, 0 KB saveable
4 images, 0 KB saveable
Info::
All images are well-optimized
4 images 138 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+Font Loading7 fonts (217 KB)PASS
Font Loading
7 fonts (217 KB)
7 fonts (217 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
7
217 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
inter-7249155f.woff2 woff2 swap
Size 26 KB
Load time 272 ms
Start 191 ms
Risk FOUT — text flashes from fallback to web font
inter-e34c5f1b.woff2 woff2 swap
Size 19 KB
Load time 257 ms
Start 192 ms
Risk FOUT — text flashes from fallback to web font
inter-6e1a6b2b.woff2 woff2 swap
Size 11 KB
Load time 217 ms
Start 192 ms
Risk FOUT — text flashes from fallback to web font
inter-656bbed6.woff2 woff2 swap
Size 19 KB
Load time 278 ms
Start 192 ms
Risk FOUT — text flashes from fallback to web font
inter-fc83e075.woff2 woff2 swap
Size 11 KB
Load time 217 ms
Start 192 ms
Risk FOUT — text flashes from fallback to web font
inter-749a3084.woff2 woff2 swap
Size 84 KB
Load time 279 ms
Start 193 ms
Risk FOUT — text flashes from fallback to web font
inter-1ab1ad55.woff2 woff2 swap
Size 48 KB
Load time 279 ms
Start 193 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+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 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-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, 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+Page Weight Inventory106 resources · 850 KB · 72 KB savings availablePASS
Page Weight Inventory
106 resources · 850 KB · 72 KB savings available
106 resources · 850 KB · 72 KB savings available
Info::
Within 1MB page-weight target
Got: 850 KB
Info::
~72 KB of savings available
Info::
3 third-party resources (13% of weight)
106 resources · 850.5 KiB · 3 third-party Within 1MB page-weight target
JavaScript 47% · 397.3 KiB
Font 26% · 217.2 KiB
Image 16% · 139.3 KiB
Document 8% · 65.9 KiB
CSS 3% · 28.3 KiB
Other 0% · 2.5 KiB
~72.4 KiB of savings available
Remove unused JavaScript: 72.4 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 106 resources | 850.5 KiB | ||||||
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 4.9 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::
1 `@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.
Network Waterfall106 requests over 2756msINFO
Network Waterfall
106 requests over 2756ms
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
3% of JavaScript execution is third-party
First-party Third-party 167ms · 108KB · €1/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
accounts.google.com accounts.google.com | Other | 107ms | 97 KB | 75% | €1/mo | Optional |
static.cloudflareinsights.com static.cloudflareinsights.com | Other | 60ms | 11 KB | — | €0/mo | Optional |
accounts.google.com
Other
Execution 107ms
Transfer 97 KB
Unused 75%
Monthly Cost €1/mo
static.cloudflareinsights.com
Other
Execution 60ms
Transfer 11 KB
Monthly Cost €0/mo
75% 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 Optimization12 images, 50 KB total, 0 KB wastedINFO
Image Optimization
12 images, 50 KB total, 0 KB wasted
Image Optimization Audit
Total Images
12
Total Size
50 KB
1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.