https://rewordsai.app
Performance
· 21 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
92
GRADE
A
FIX
1
REVIEW
3
PASS
15
INFO
2
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
68
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.
2.58 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.15 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 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.
2.58 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.
3.16 s
Page Load Progression
460 ms
919 ms
1.4 s
1.8 s
2.3 s 2.8 s 3.2 s
3.7 sChecks
2115 PASS 3 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: 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 |
CJS Execution CostAction1179ms total JS executionREVIEW
JS Execution Cost
Action1179ms total JS execution
1179ms total JS execution
Warning::
https://rewordsai.app/: 446ms CPU time
Warning::
https://rewordsai.app/assets/framework-DJH1pfSr.js: 420ms CPU time
Info::
Unattributable: 163ms CPU time
Info::
https://rewordsai.app/assets/workspace-DFC36FZF.js: 149ms CPU time
Main Thread Breakdown
Script Evaluation 38% Other 27% Style & Layout 24% Rendering 5% Script Parsing & Compilation 3%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://rewordsai.app/ | 446ms | 15ms | 27ms | 1st |
| https://rewordsai.app/assets/framework-DJH1pfSr.js | 420ms | 394ms | 2ms | 1st |
| Unattributable | 163ms | 14ms | 0ms | 1st |
| https://rewordsai.app/assets/workspace-DFC36FZF.js | 149ms | 20ms | 0ms | 1st |
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 | 2 KB | — | ✓ | 1st |
| https://rewordsai.app/assets/react-DlbkFqaW.js | 14 KB | — | ✓ | 1st |
| https://rewordsai.app/assets/BaseLink-DhOccf1O.js | 2 KB | — | ✓ | 1st |
| https://rewordsai.app/assets/link-CfIhK7YT.js | 5 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
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 Budget917 KB transferred, 109 requestsPASS
Page Weight Budget
917 KB transferred, 109 requests
917 KB transferred, 109 requests
Info::
Page weighs 1.9 MB (917 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::
109 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.19 g CO2 per page load
917 KB transferred
109 requests
0.19 g CO2 per page load
JavaScript 400.1 KiB 44%
Fonts 217.2 KiB 24%
Images 201.8 KiB 22%
HTML 66.2 KiB 7%
CSS 28.5 KiB 3%
Other 2.0 KiB 0%
Other 1.2 KiB 0%
Other 460 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 Impact12% third-party, 0 ms blockingPASS
Third-Party Impact
12% third-party, 0 ms blocking
12% third-party, 0 ms blocking
Info::
Third-party code accounts for 12% of page weight (108.8 KiB of 917.3 KiB)
Info::
Third-party blocking time is low (0 ms)
88%
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 Optimization7 images, 0 KB saveablePASS
Image Optimization
7 images, 0 KB saveable
7 images, 0 KB saveable
Info::
All images are well-optimized
7 images 202 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 249 ms
Start 172 ms
Risk FOUT — text flashes from fallback to web font
inter-e34c5f1b.woff2 woff2 swap
Size 19 KB
Load time 235 ms
Start 172 ms
Risk FOUT — text flashes from fallback to web font
inter-6e1a6b2b.woff2 woff2 swap
Size 11 KB
Load time 240 ms
Start 172 ms
Risk FOUT — text flashes from fallback to web font
inter-656bbed6.woff2 woff2 swap
Size 19 KB
Load time 249 ms
Start 173 ms
Risk FOUT — text flashes from fallback to web font
inter-fc83e075.woff2 woff2 swap
Size 11 KB
Load time 235 ms
Start 173 ms
Risk FOUT — text flashes from fallback to web font
inter-749a3084.woff2 woff2 swap
Size 84 KB
Load time 257 ms
Start 173 ms
Risk FOUT — text flashes from fallback to web font
inter-1ab1ad55.woff2 woff2 swap
Size 48 KB
Load time 256 ms
Start 173 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+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 Inventory109 resources · 917 KB · 72 KB savings availablePASS
Page Weight Inventory
109 resources · 917 KB · 72 KB savings available
109 resources · 917 KB · 72 KB savings available
Info::
Within 1MB page-weight target
Got: 917 KB
Info::
~72 KB of savings available
Info::
3 third-party resources (12% of weight)
109 resources · 917.3 KiB · 3 third-party Within 1MB page-weight target
JavaScript 44% · 400.1 KiB
Font 24% · 217.2 KiB
Image 22% · 202.9 KiB
Document 7% · 66.2 KiB
CSS 3% · 28.5 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 |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 109 resources | 917.3 KiB | ||||||
Network Waterfall109 requests over 1342msINFO
Network Waterfall
109 requests over 1342ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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.