https://containere.eu
Performance
· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
86
GRADE
B
FIX
2
REVIEW
7
PASS
10
INFO
4
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
97
92
96
85
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
604 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.17 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.
0.002
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
764 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.
1.17 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
2310 PASS 7 REVIEW 2 FIX
FPage Weight BudgetAction3.4 MB transferred, 90 requestsFIX
Page Weight Budget
Action3.4 MB transferred, 90 requests
3.4 MB transferred, 90 requests
Warning::
Page weighs 5.0 MB (3.4 MB transferred)
Warning::
Images are 2.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.1 MB
Info::
Fonts are 803 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 803 KB
Info::
90 HTTP requests
Info::
Estimated 0.70 g CO2 per page load
3.4 MB transferred
90 requests
0.70 g CO2 per page load
Images 2.1 MiB 63%
Fonts 802.8 KiB 23%
JavaScript 333.9 KiB 10%
CSS 94.7 KiB 3%
HTML 21.1 KiB 1%
Other 886 B 0%
Other 546 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
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
FHTTP CachingActionNo cache headersFIX
HTTP Caching
ActionNo cache headers
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization18 images, 0 KB saveableREVIEW
Image Optimization
18 images, 0 KB saveable
18 images, 0 KB saveable
Warning::
https://containere.eu/wp-content/uploads/elementor... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 2.1 MB
0 oversized -0 KB
18 legacy format
1 missing dimensions CLS risk
Set explicit width and height to prevent CLS.
Why this matters
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
BJS Execution Cost543ms total JS executionREVIEW
JS Execution Cost
543ms total JS execution
543ms total JS execution
Info::
https://containere.eu/: 169ms CPU time
Info::
https://containere.eu/wp-content/plugins/elementor...: 113ms CPU time
Info::
https://containere.eu/wp-includes/js/jquery/jquery...: 106ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=GT-NFR...: 79ms CPU time
Info::
Unattributable: 75ms CPU time
Info::
Third-party scripts: 79ms (15% of total)
Main Thread Breakdown
Script Evaluation 39% Other 30% Style & Layout 16% Rendering 6% Script Parsing & Compilation 5% Parse HTML & CSS 4%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://containere.eu/ | 169ms | 3ms | 1ms | 1st |
| https://containere.eu/wp-content/plugins/elementor-pro/assets/js/frontend.min.js?ver=3.28.3 | 113ms | 28ms | 1ms | 1st |
| https://containere.eu/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 | 106ms | 92ms | 2ms | 1st |
| https://www.googletagmanager.com/gtag/js?id=GT-NFRNT5D | 79ms | 65ms | 14ms | 3rd |
| Unattributable | 75ms | 2ms | 0ms | 1st |
BJS Bundles28 scripts, 100 KB unusedREVIEW
JS Bundles
28 scripts, 100 KB unused
28 scripts, 100 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-NFR...: 73 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://containere.eu/wp-content/plugins/elementsk...: 27 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 100 KB
100 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=GT-NFRNT5D | 177 KB | 73 KB (41%) | ✓ | 3rd |
| https://containere.eu/wp-content/plugins/elementskit-lite/widgets/init/assets/js/widget-scripts.js?ver=3.7.9 | 34 KB | 27 KB (78%) | ✓ | 1st |
| https://containere.eu/wp-content/plugins/elementor-pro/assets/js/frontend.min.js?ver=3.28.3 | 6 KB | — | ✓ | 1st |
| https://containere.eu/wp-content/plugins/elementor-pro/assets/js/posts.aec59265318492b89cb5.bundle.min.js | 1 KB | — | ✓ | 1st |
| https://containere.eu/wp-content/plugins/elementor/assets/js/frontend-modules.min.js?ver=3.35.5 | 15 KB | — | ✓ | 1st |
| https://containere.eu/wp-includes/js/jquery/ui/core.min.js?ver=1.14.2 | 6 KB | — | ✓ | 1st |
| https://containere.eu/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=3.35.5 | 10 KB | — | ✓ | 1st |
| https://containere.eu/wp-content/plugins/elementor-pro/assets/lib/smartmenus/jquery.smartmenus.min.js?ver=1.2.1 | 7 KB | — | ✓ | 1st |
| https://containere.eu/wp-includes/js/imagesloaded.min.js?ver=5.0.0 | 2 KB | — | ✓ | 1st |
| https://containere.eu/wp-content/plugins/elementskit-lite/libs/framework/assets/js/frontend-script.js?ver=3.7.9 | 0 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
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
Main HTML Cache-Control
No Cache-Control header on main HTML response
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
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 InventoryAction90 resources · 3.4 MB · 100 KB savings availableREVIEW
Page Weight Inventory
Action90 resources · 3.4 MB · 100 KB savings available
90 resources · 3.4 MB · 100 KB savings available
Warning::
Page weight 3.4 MB exceeds 1 MB target by 2.4 MB
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~100 KB of savings available
Info::
3 third-party resources (5% of weight)
Info::
5 resources over 200KB
90 resources · 3.4 MiB · 3 third-party 2.4 MiB over 1MB target
Image 63% · 2.1 MiB
Font 23% · 802.8 KiB
JavaScript 10% · 333.9 KiB
CSS 3% · 94.7 KiB
Document 1% · 21.9 KiB
Other 0% · 546 B
~99.9 KiB of savings available
Remove unused JavaScript: 99.9 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 90 resources | 3.4 MiB | ||||||
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
A+Third-Party Impact5% third-party, 0 ms blockingPASS
Third-Party Impact
5% third-party, 0 ms blocking
5% third-party, 0 ms blocking
Info::
Third-party code accounts for 5% of page weight (177.6 KiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
95%
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 Loading11 fonts (803 KB)PASS
Font Loading
11 fonts (803 KB)
11 fonts (803 KB)
Info::
11 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
11
803 KB total
Render-blocking
0
of 11
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
firasans-va9b4kdnxmzdwf... woff2 swap
Size 24 KB
Load time 115 ms
Start 626 ms
Risk FOUT — text flashes from fallback to web font
firasans-va9e4kdnxmzdwf... woff2 swap
Size 23 KB
Load time 116 ms
Start 627 ms
Risk FOUT — text flashes from fallback to web font
firasans-va9b4kdnxmzdwf... woff2 swap
Size 24 KB
Load time 116 ms
Start 628 ms
Risk FOUT — text flashes from fallback to web font
elementskit.woff woff swap
Size 450 KB
Load time 134 ms
Start 628 ms
Risk FOUT — text flashes from fallback to web font
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
inter-ucc73fwrk3iltehus... woff2 swap
Size 47 KB
Load time 116 ms
Start 628 ms
Risk FOUT — text flashes from fallback to web font
firasans-va9e4kdnxmzdwf... woff2 swap
Size 42 KB
Load time 116 ms
Start 629 ms
Risk FOUT — text flashes from fallback to web font
firasans-va9f4kdnxmzdwf... woff2 swap
Size 24 KB
Load time 116 ms
Start 630 ms
Risk FOUT — text flashes from fallback to web font
firasans-va9b4kdnxmzdwf... woff2 swap
Size 46 KB
Load time 116 ms
Start 631 ms
Risk FOUT — text flashes from fallback to web font
firasans-va9f4kdnxmzdwf... woff2 swap
Size 25 KB
Load time 112 ms
Start 635 ms
Risk FOUT — text flashes from fallback to web font
inter-ucc73fwrk3iltehus... woff2 swap
Size 73 KB
Load time 118 ms
Start 635 ms
Risk FOUT — text flashes from fallback to web font
firasans-va9c4kdnxmzdwf... woff2 swap
Size 24 KB
Load time 117 ms
Start 635 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)
Fixing the unchecked items could save ~360 KB and ~720 ms
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+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
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.
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 Waterfall90 requests over 1098msINFO
Network Waterfall
90 requests over 1098ms
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
15% of JavaScript execution is third-party
First-party Third-party 79ms · 177KB · lei3/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 79ms | 177 KB | 41% | lei3/mo | Optional |
Google Tag Manager
Tag Manager
Execution 79ms
Transfer 177 KB
Unused 41%
Monthly Cost lei3/mo
Image Optimization12 images, 1212 KB total, 658 KB wastedINFO
Image Optimization
12 images, 1212 KB total, 658 KB wasted
Image Optimization Audit
Total Images
12
Total Size
1212 KB
Oversized
6
Wasted
658 KB
1 missing dimensions 2 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.