https://rentcar4less.com
Performance
· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
92
GRADE
A
FIX
0
REVIEW
6
PASS
17
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
61
92
77
92
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
4.31 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
6.13 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
264 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.010
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.89 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.
6.81 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
2617 PASS 6 REVIEW
BImage Optimization14 images, 0 KB saveableREVIEW
Image Optimization
14 images, 0 KB saveable
14 images, 0 KB saveable
Info::
All images are well-optimized
14 images 405 KB
0 oversized -0 KB
13 legacy format
0 missing dimensions CLS risk
CJS Execution CostAction1498ms total JS executionREVIEW
JS Execution Cost
Action1498ms total JS execution
1498ms total JS execution
Warning::
https://rentcar4less.com/: 456ms CPU time
Warning::
https://rentcar4less.com/sites/rentcar4less/files/...: 336ms CPU time
Warning::
https://cdn.jsdelivr.net/gh/jfeltkamp/cookiesjsr@1...: 325ms CPU time
Info::
Unattributable: 225ms CPU time
Info::
https://rentcar4less.com/sites/rentcar4less/files/...: 105ms CPU time
Info::
Third-party scripts: 325ms (22% of total)
Main Thread Breakdown
Script Evaluation 39% Style & Layout 24% Other 21% Script Parsing & Compilation 7% Rendering 5% Parse HTML & CSS 4%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://rentcar4less.com/ | 456ms | 7ms | 1ms | 1st |
| https://rentcar4less.com/sites/rentcar4less/files/js/js_7NCcGUCZJzBedUMnUT3288dmmSWlzCYIrZFoY1U0We8.js?scope=header&delta=0&language=en&theme=rentcar4less_theme&include=eJxNi1sKwkAQBC8Usj_eZxknHTPZl0wPAW-voMJ-FdVF6xjFwKRfnvRVt778ND8kSZf6ClMup1xSTQ-mTQJP0wKfRgfhl4SNnvfhbUr8oEwe1v5_Rw8Vv1WQOQ40pLsQb9LtO5k | 336ms | 201ms | 2ms | 1st |
| https://cdn.jsdelivr.net/gh/jfeltkamp/cookiesjsr@1/dist/cookiesjsr.min.js?v=1.0.13 | 325ms | 273ms | 50ms | 3rd |
| Unattributable | 225ms | 8ms | 0ms | 1st |
| https://rentcar4less.com/sites/rentcar4less/files/js/js_nbMAY7D2fsYlpRPsJyyYBuadAnSPBEUH0vsrQXPJQZk.js?scope=footer&delta=0&language=en&theme=rentcar4less_theme&include=eJxNi1sKwkAQBC8Usj_eZxknHTPZl0wPAW-voMJ-FdVF6xjFwKRfnvRVt778ND8kSZf6ClMup1xSTQ-mTQJP0wKfRgfhl4SNnvfhbUr8oEwe1v5_Rw8Vv1WQOQ40pLsQb9LtO5k | 105ms | 76ms | 24ms | 1st |
| https://rentcar4less.com/sites/rentcar4less/files/js/js_zo3lHxF5vOoMaYbkwqkrrzMqowXTNrE-po3GIS9hC5c.js?scope=footer&delta=2&language=en&theme=rentcar4less_theme&include=eJxNi1sKwkAQBC8Usj_eZxknHTPZl0wPAW-voMJ-FdVF6xjFwKRfnvRVt778ND8kSZf6ClMup1xSTQ-mTQJP0wKfRgfhl4SNnvfhbUr8oEwe1v5_Rw8Vv1WQOQ40pLsQb9LtO5k | 50ms | 23ms | 26ms | 1st |
BJS Bundles6 scripts, 117 KB unusedREVIEW
JS Bundles
6 scripts, 117 KB unused
6 scripts, 117 KB unused
Warning::
https://cdn.jsdelivr.net/gh/jfeltkamp/cookiesjsr@1...: 50 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://rentcar4less.com/sites/rentcar4less/files/...: 34 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://rentcar4less.com/sites/rentcar4less/files/...: 33 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 117 KB
117 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.jsdelivr.net/gh/jfeltkamp/cookiesjsr@1/dist/cookiesjsr.min.js?v=1.0.13 | 109 KB | 50 KB (46%) | ✓ | 3rd |
| https://rentcar4less.com/sites/rentcar4less/files/js/js_nbMAY7D2fsYlpRPsJyyYBuadAnSPBEUH0vsrQXPJQZk.js?scope=footer&delta=0&language=en&theme=rentcar4less_theme&include=eJxNi1sKwkAQBC8Usj_eZxknHTPZl0wPAW-voMJ-FdVF6xjFwKRfnvRVt778ND8kSZf6ClMup1xSTQ-mTQJP0wKfRgfhl4SNnvfhbUr8oEwe1v5_Rw8Vv1WQOQ40pLsQb9LtO5k | 54 KB | 34 KB (62%) | ✓ | 1st |
| https://rentcar4less.com/sites/rentcar4less/files/js/js_zo3lHxF5vOoMaYbkwqkrrzMqowXTNrE-po3GIS9hC5c.js?scope=footer&delta=2&language=en&theme=rentcar4less_theme&include=eJxNi1sKwkAQBC8Usj_eZxknHTPZl0wPAW-voMJ-FdVF6xjFwKRfnvRVt778ND8kSZf6ClMup1xSTQ-mTQJP0wKfRgfhl4SNnvfhbUr8oEwe1v5_Rw8Vv1WQOQ40pLsQb9LtO5k | 46 KB | 33 KB (72%) | ✓ | 1st |
| https://rentcar4less.com/sites/rentcar4less/files/js/js_7NCcGUCZJzBedUMnUT3288dmmSWlzCYIrZFoY1U0We8.js?scope=header&delta=0&language=en&theme=rentcar4less_theme&include=eJxNi1sKwkAQBC8Usj_eZxknHTPZl0wPAW-voMJ-FdVF6xjFwKRfnvRVt778ND8kSZf6ClMup1xSTQ-mTQJP0wKfRgfhl4SNnvfhbUr8oEwe1v5_Rw8Vv1WQOQ40pLsQb9LtO5k | 3 KB | — | ✓ | 1st |
| https://rentcar4less.com/modules/contrib/cookies/js/cookiesjsr.conf.js?v=10.6.13 | 0 KB | — | ✓ | 1st |
| https://cdn.jsdelivr.net/gh/jfeltkamp/cookiesjsr@1/dist/cookiesjsr-preloader.min.js | 8 KB | — | ✓ | 3rd |
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
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
HTTP/3 (QUIC)
HTTP/3 not advertised
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
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.
BHTTP Cachingmust-revalidate, no-cache, privateREVIEW
HTTP Caching
must-revalidate, no-cache, private
must-revalidate, no-cache, private
Info::
Cache-Control header is set
Got: must-revalidate, no-cache, private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
must-revalidate, no-cache, private
| Directive | Value | Meaning |
|---|---|---|
| must-revalidate | — | Must recheck with server after expiry |
| no-cache | — | Cache but always revalidate first |
| private | — | Only browser cache, not CDN/proxy |
APage Weight Budget734 KB transferred, 27 requestsPASS
Page Weight Budget
734 KB transferred, 27 requests
734 KB transferred, 27 requests
Info::
Page weighs 1.4 MB (734 KB transferred)
Info::
27 HTTP requests
Info::
Estimated 0.15 g CO2 per page load
734 KB transferred
27 requests
0.15 g CO2 per page load
Images 404.9 KiB 55%
JavaScript 221.2 KiB 30%
Fonts 38.3 KiB 5%
CSS 35.8 KiB 5%
Other 22.3 KiB 3%
HTML 11.7 KiB 2%
0 2.4 MB 4.9 MB
Under budget
AThird-Party Impact21% third-party, 0 ms blockingPASS
Third-Party Impact
21% third-party, 0 ms blocking
21% third-party, 0 ms blocking
Info::
Third-party code accounts for 21% of page weight (157.0 KiB of 734.2 KiB)
Info::
Third-party blocking time is low (0 ms)
79%
21%
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 Loading1 fonts (38 KB)PASS
Font Loading
1 fonts (38 KB)
1 fonts (38 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
1
38 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
XRXV3I6Li01BKofINeaBTMn... woff2 swap
Size 38 KB
Load time 7 ms
Start 1.6 s
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 Hints1 hints, 0 missing preconnectsPASS
Resource Hints
1 hints, 0 missing preconnects
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)
Current Resource Hints
preconnect—
preload 1
dns-prefetch—
prefetch—
1 resource hints configured
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-cache -- safe revalidate-on-request policyPASS
Main HTML Cache-Control
Main HTML uses no-cache -- safe revalidate-on-request policy
Main HTML uses no-cache -- safe revalidate-on-request policy
Info::
Main HTML uses no-cache -- safe revalidate-on-request policy
Got: must-revalidate, no-cache, private
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,User-Agent
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 Inventory27 resources · 734 KB · 117 KB savings availablePASS
Page Weight Inventory
27 resources · 734 KB · 117 KB savings available
27 resources · 734 KB · 117 KB savings available
Info::
Within 1MB page-weight target
Got: 734 KB
Info::
~117 KB of savings available
Info::
6 third-party resources (21% of weight)
Info::
1 resources over 200KB
27 resources · 734.2 KiB · 6 third-party Within 1MB page-weight target
Image 58% · 427.2 KiB
JavaScript 30% · 221.2 KiB
Font 5% · 38.3 KiB
CSS 5% · 35.8 KiB
Document 2% · 11.7 KiB
~117.0 KiB of savings available
Remove unused JavaScript: 117.0 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 27 resources | 734.2 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::
4 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
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: ALL-INKL.COM
Network Waterfall27 requests over 2509msINFO
Network Waterfall
27 requests over 2509ms
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
22% of JavaScript execution is third-party
First-party Third-party 325ms · 109KB · €4/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
jsDelivr cdn.jsdelivr.net | CDN | 325ms | 109 KB | 46% | €4/mo | Costly |
jsDelivr
CDN
Execution 325ms
Transfer 109 KB
Unused 46%
Monthly Cost €4/mo
These scripts may cost more than they're worth
- jsDelivr adds 325ms and costs ~€4/month
jsDelivr takes 325ms 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
Image Optimization11 images, 174 KB total, 42 KB wastedINFO
Image Optimization
11 images, 174 KB total, 42 KB wasted
Image Optimization Audit
Total Images
11
Total Size
174 KB
Oversized
3
Wasted
42 KB
11 missing dimensions 11 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.