https://symfony.com
Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
96
GRADE
A
FIX
0
REVIEW
1
PASS
12
INFO
2
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
100
89
100
85
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
521 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
521 ms
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.
0.006
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
689 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.
521 ms
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
1512 PASS 1 REVIEW
BHTTP Cachingpublic, s-maxage=1200REVIEW
HTTP Caching
public, s-maxage=1200
public, s-maxage=1200
Info::
Cache-Control header is set
Got: public, s-maxage=1200
Info::
CDN TTL: 20 minutes (s-maxage=1200)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
public, s-maxage=1200
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| s-maxage | 1200 | CDN caches for 20 minutes |
A+Page Weight Budget224 KB transferred, 38 requestsPASS
Page Weight Budget
224 KB transferred, 38 requests
224 KB transferred, 38 requests
Info::
Page weighs 1004 KB (224 KB transferred)
Info::
38 HTTP requests
Info::
Estimated 0.05 g CO2 per page load
224 KB transferred
38 requests
0.05 g CO2 per page load
JavaScript 126.0 KiB 56%
HTML 34.1 KiB 15%
Other 28.1 KiB 13%
Images 22.7 KiB 10%
Other 5.2 KiB 2%
CSS 5.0 KiB 2%
Other 1.7 KiB 1%
Other 911 B 0%
Other 345 B 0%
0 2.4 MB 4.9 MB
Under budget
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 (28.6 KiB of 224.0 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.
AImage Optimization5 images, 0 KB saveablePASS
Image Optimization
5 images, 0 KB saveable
5 images, 0 KB saveable
Info::
All images are well-optimized
5 images 23 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+JS Execution Cost277ms total JS executionPASS
JS Execution Cost
277ms total JS execution
277ms total JS execution
Info::
https://symfony.com/: 136ms CPU time
Info::
Unattributable: 78ms CPU time
Info::
https://symfony.com/assets/vendor/asciinema-player...: 63ms CPU time
Info::
Third-party scripts: 78ms (28% of total)
Main Thread Breakdown
Other 32% Script Evaluation 30% Style & Layout 24% Parse HTML & CSS 7% Rendering 5%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://symfony.com/ | 136ms | 11ms | 2ms | 1st |
| Unattributable | 78ms | 3ms | 0ms | 3rd |
| https://symfony.com/assets/vendor/asciinema-player/asciinema-player.index-VQSUk_R.js | 63ms | 48ms | 0ms | 1st |
A+Font LoadingNo web fonts (system fonts)PASS
Font Loading
No web fonts (system fonts)
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+JS Bundles18 scripts, 0 KB unusedPASS
JS Bundles
18 scripts, 0 KB unused
18 scripts, 0 KB unused
0 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://symfony.com/assets/app-iodFN2G.js | 1 KB | — | ✓ | 1st |
| https://symfony.com/assets/vendor/bootstrap/js/src/offcanvas-HKB-RdI.js | 6 KB | — | ✓ | 1st |
| https://symfony.com/assets/stimulus-NEEjnKA.js | 0 KB | — | ✓ | 1st |
| https://symfony.com/assets/@symfony/stimulus-bundle/loader-IOzBDLu.js | 1 KB | — | ✓ | 1st |
| https://symfony.com/assets/vendor/@hotwired/stimulus/stimulus.index-S4zNcea.js | 12 KB | — | ✓ | 1st |
| https://symfony.com/assets/@symfony/stimulus-bundle/controllers-67OXZ9x.js | 1 KB | — | ✓ | 1st |
| https://symfony.com/assets/@symfony/ux-live-component/live_controller-qMGNvHD.js | 20 KB | — | ✗ | 1st |
| https://symfony.com/assets/controllers/download_chart_controller-c-oBQZq.js | 1 KB | — | ✓ | 1st |
| https://symfony.com/assets/controllers/eventsmap_controller-3shcJI3.js | 1 KB | — | ✓ | 1st |
| https://symfony.com/assets/search-ID8xbgA.js | 2 KB | — | ✓ | 1st |
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+Page Weight Inventory38 resources · 224 KB · 0 KB savings availablePASS
Page Weight Inventory
38 resources · 224 KB · 0 KB savings available
38 resources · 224 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 224 KB
Info::
8 third-party resources (13% of weight)
38 resources · 224.0 KiB · 8 third-party Within 1MB page-weight target
JavaScript 57% · 126.6 KiB
Document 28% · 62.2 KiB
Image 11% · 24.4 KiB
Other 3% · 5.8 KiB
CSS 2% · 5.0 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 38 resources | 224.0 KiB | ||||||
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
Network Waterfall38 requests over 1142msINFO
Network Waterfall
38 requests over 1142ms
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
28% of JavaScript execution is third-party
First-party Third-party 78ms · 0KB · €1/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 78ms | 0 KB | — | €1/mo | Optional |
Unattributable
Other
Execution 78ms
Transfer 0 KB
Monthly Cost €1/mo
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.