Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop

Performance

Accessibility

100

Best Practices

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

4.81 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

7.23 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.

5.76 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.

7.36 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 s

Checks

8 PASS 4 REVIEW 3 FIX

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (1.8 MiB of 1.8 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

Page Weight Inventory

Action

61 resources · 1.8 MB · 37 KB savings available

FIX

61 resources · 1.8 MB · 37 KB savings available

Page weight 810 KB over 1MB target

Got: 1.8 MB Expected: ≤ 1 MB

60 third-party resources (100% of weight)

2 resources over 200KB

61 resources · 1.8 MiB · 60 third-party 809.9 KiB over 1MB target

Image 80% · 1.4 MiB

JavaScript 10% · 188.0 KiB

Font 6% · 107.2 KiB

CSS 3% · 61.3 KiB

Document 1% · 14.1 KiB

Other 0% · 242 B

~37.3 KiB of savings available

Remove unused JavaScript: 37.3 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

61 resources			1.8 MiB

HTTP Caching

Action

No cache headers

FIX

No cache headers

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.

Page Weight Budget

Action

1.8 MB transferred, 61 requests

REVIEW

1.8 MB transferred, 61 requests

Page weighs 2.3 MB (1.8 MB transferred)

Images are 1.4 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 1.4 MB

61 HTTP requests

Estimated 0.38 g CO2 per page load

1.8 MB transferred

61 requests

0.38 g CO2 per page load

Images 1.4 MiB 80%

JavaScript 188.0 KiB 10%

Fonts 107.2 KiB 6%

CSS 61.3 KiB 3%

HTML 13.5 KiB 1%

Other 2.1 KiB 0%

Other 533 B 0%

0 2.4 MB 4.9 MB

Approaching limit

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

Image Optimization

14 images, 0 KB saveable

REVIEW

14 images, 0 KB saveable

https://www.cnr.it/sites/all/themes/custom/cnr03_t... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

14 images 1.4 MB

0 oversized -0 KB

14 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

JS Execution Cost

899ms total JS execution

REVIEW

899ms total JS execution

https://www.cnr.it/sites/all/modules/contrib/jquer...: 347ms CPU time

Unattributable: 328ms CPU time

https://www.cnr.it/sites/all/libraries/mediaboxes/...: 117ms CPU time

https://www.cnr.it//: 107ms CPU time

Third-party scripts: 899ms (100% of total)

Main Thread Breakdown

Other 37% Script Evaluation 32% Style & Layout 18% Parse HTML & CSS 5% Script Parsing & Compilation 4%

Script	Total	Scripting	Parse/Compile	Party
https://www.cnr.it/sites/all/modules/contrib/jquery_update/replace/jquery/1.9/jquery.min.js?v=1.9.1	347ms	170ms	10ms	3rd
Unattributable	328ms	5ms	0ms	3rd
https://www.cnr.it/sites/all/libraries/mediaboxes/plugins/js/jquery.imagesLoaded.min.js?tdslzg	117ms	89ms	1ms	3rd
https://www.cnr.it//	107ms	6ms	3ms	3rd

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

3 fonts (107 KB)

PASS

3 fonts (107 KB)

3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

107 KB total

Render-blocking

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

roboto-v29-latin-regula... woff2 swap

Size 16 KB

Load time 40 ms

Start 860 ms

Risk FOUT — text flashes from fallback to web font

roboto-v29-latin-500.woff2 woff2 swap

Size 16 KB

Load time 73 ms

Start 860 ms

Risk FOUT — text flashes from fallback to web font

fontawesome-webfont.woff2 woff2 swap

Size 76 KB

Load time 142 ms

Start 861 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)

JS Bundles

29 scripts, 37 KB unused

PASS

29 scripts, 37 KB unused

https://metrics.cedrc.cnr.it/matomo.js: 37 KB unused (60%)

Consider code splitting or tree shaking to reduce unused code.

https://www.cnr.it/misc/drupal.js?tdslzg: unminified — 5 KB could be saved

Total unused JavaScript: 37 KB

37 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://metrics.cedrc.cnr.it/matomo.js	63 KB	37 KB (60%)	✓	3rd
https://www.cnr.it/sites/all/themes/custom/cnr03_theme/bootstrap/js/popover.js?tdslzg	2 KB	—	✓	3rd
https://www.cnr.it/sites/all/libraries/mediaboxes/plugins/js/modernizr.custom.min.js?tdslzg	1 KB	—	✓	3rd
https://www.cnr.it/misc/jquery.once.js?v=1.2	1 KB	—	✓	3rd
https://www.cnr.it/misc/drupal.js?tdslzg	7 KB	—	✗	3rd
https://www.cnr.it/sites/all/themes/custom/cnr03_theme/bootstrap/js/scrollspy.js?tdslzg	2 KB	—	✓	3rd
https://www.cnr.it/sites/all/themes/custom/cnr03_theme/bootstrap/js/affix.js?tdslzg	2 KB	—	✓	3rd
https://www.cnr.it/sites/all/themes/custom/cnr03_theme/bootstrap/js/alert.js?tdslzg	1 KB	—	✓	3rd
https://www.cnr.it/sites/all/themes/custom/cnr03_theme/bootstrap/js/button.js?tdslzg	2 KB	—	✓	3rd
https://www.cnr.it/sites/all/themes/custom/cnr03_theme/bootstrap/js/carousel.js?tdslzg	2 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

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

Network Waterfall

61 requests over 3231ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

100% of JavaScript execution is third-party

First-party Third-party 899ms · 49KB · €10/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
www.cnr.it www.cnr.it	Other	347ms	32 KB	—	€4/mo	Costly
Unattributable Unattributable	Other	328ms	0 KB	—	€4/mo	Costly
www.cnr.it www.cnr.it	Other	117ms	3 KB	—	€1/mo	Optional
www.cnr.it www.cnr.it	Other	107ms	13 KB	—	€1/mo	Optional

www.cnr.it

Other

Costly

Execution 347ms

Transfer 32 KB

Monthly Cost €4/mo

Unattributable

Other

Costly

Execution 328ms

Transfer 0 KB

Monthly Cost €4/mo

www.cnr.it

Other

Optional

Execution 117ms

Transfer 3 KB

Monthly Cost €1/mo

www.cnr.it

Other

Optional

Execution 107ms

Transfer 13 KB

Monthly Cost €1/mo

These scripts may cost more than they're worth

www.cnr.it adds 347ms and costs ~€4/month
Unattributable adds 328ms and costs ~€4/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.cnr.it takes 347ms 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

Unattributable takes 328ms 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

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.