Performance

· 15 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

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.

403 ms

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

1.79 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

23 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.055

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.97 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.

4.01 s

Page Load Progression

569 ms

1.1 s

1.7 s

2.3 s

2.8 s

3.4 s

4.0 s

4.6 s

Checks

6 PASS 5 REVIEW 2 FIX

Page Weight Budget

Action

3.6 MB transferred, 262 requests

FIX

3.6 MB transferred, 262 requests

Page weighs 7.9 MB (3.6 MB transferred)

Images are 2.0 MB — compress or use modern formats

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

Got: 2.0 MB

JavaScript is 950 KB — consider code splitting or lazy loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Got: 950 KB

262 HTTP requests — consider bundling or reducing

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Estimated 0.75 g CO2 per page load

3.6 MB transferred

262 requests

0.75 g CO2 per page load

Images 2.0 MiB 56%

JavaScript 949.9 KiB 26%

Fonts 176.0 KiB 5%

Other 167.3 KiB 5%

CSS 135.6 KiB 4%

HTML 133.9 KiB 4%

Other 49.3 KiB 1%

Other 7.0 KiB 0%

Other 735 B 0%

Other 169 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

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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

Page Weight Inventory

Action

262 resources · 3.6 MB · 300 KB savings available

FIX

262 resources · 3.6 MB · 300 KB savings available

Page weight 2.6 MB over 1MB target

Got: 3.6 MB Expected: ≤ 1 MB

~300 KB of savings available

164 third-party resources (55% of weight)

2 resources over 200KB

262 resources · 3.6 MiB · 164 third-party 2.6 MiB over 1MB target

Image 56% · 2.0 MiB

JavaScript 26% · 950.6 KiB

Other 6% · 217.0 KiB

Font 5% · 176.0 KiB

CSS 4% · 135.6 KiB

Document 4% · 134.4 KiB

~299.8 KiB of savings available

Remove unused JavaScript: 299.8 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

262 resources			3.6 MiB

Third-Party Impact

55% third-party, 0 ms blocking

REVIEW

55% third-party, 0 ms blocking

Third-party code accounts for 55% of page weight (2.0 MiB of 3.6 MiB)

Third-party blocking time is low (0 ms)

45%

55%

First-party Third-party

Image Optimization

Action

122 images, 0 KB saveable

REVIEW

122 images, 0 KB saveable

https://cadenaser.com/estaticos/recursosgraficos/r... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://cadenaser.com/pf/resources/img/ico-aud.svg... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://cadenaser.com/pf/resources/img/ico-vid.svg... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

122 images 2.0 MB

0 oversized -0 KB

64 legacy format

3 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

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

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

Action

1708ms total JS execution

REVIEW

1708ms total JS execution

https://cadenaser.com/: 778ms CPU time

Unattributable: 509ms CPU time

https://assets.adobedtm.com/0681c221600c/b59a37979...: 231ms CPU time

https://dd.cadenaser.com/tags.js: 122ms CPU time

https://sdk.privacy-center.org/sdk/d4911c3d5b4b9a8...: 68ms CPU time

Third-party scripts: 930ms (54% of total)

Main Thread Breakdown

Script Evaluation 35% Other 33% Style & Layout 17% Rendering 9% Script Parsing & Compilation 4%

Script	Total	Scripting	Parse/Compile	Party
https://cadenaser.com/	778ms	16ms	5ms	1st
Unattributable	509ms	70ms	0ms	3rd
https://assets.adobedtm.com/0681c221600c/b59a37979c54/launch-475bab79d334.min.js	231ms	198ms	21ms	3rd
https://dd.cadenaser.com/tags.js	122ms	108ms	3ms	3rd
https://sdk.privacy-center.org/sdk/d4911c3d5b4b9a80b40e05167f53d1b1e8da81f3/modern/sdk.d4911c3d5b4b9a80b40e05167f53d1b1e8da81f3.js	68ms	58ms	7ms	3rd

JS Bundles

Action

80 scripts, 300 KB unused

REVIEW

80 scripts, 300 KB unused

https://accounts.google.com/gsi/client: 68 KB unused (71%)

Consider code splitting or tree shaking to reduce unused code.

https://player.prisamedia.com/core//js/coreplayer....: 51 KB unused (74%)

Consider code splitting or tree shaking to reduce unused code.

https://assets.adobedtm.com/0681c221600c/b59a37979...: 49 KB unused (35%)

Consider code splitting or tree shaking to reduce unused code.

https://sdk.privacy-center.org/sdk/d4911c3d5b4b9a8...: 43 KB unused (42%)

Consider code splitting or tree shaking to reduce unused code.

https://ak-ads-ns.prisasd.com/slot/cadenaser/slot....: 36 KB unused (75%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 300 KB

300 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://accounts.google.com/gsi/client	96 KB	68 KB (71%)	✓	3rd
https://player.prisamedia.com/core//js/coreplayer.min.js	69 KB	51 KB (74%)	✓	3rd
https://assets.adobedtm.com/0681c221600c/b59a37979c54/launch-475bab79d334.min.js	140 KB	49 KB (35%)	✓	3rd
https://sdk.privacy-center.org/sdk/d4911c3d5b4b9a80b40e05167f53d1b1e8da81f3/modern/sdk.d4911c3d5b4b9a80b40e05167f53d1b1e8da81f3.js	101 KB	43 KB (42%)	✓	3rd
https://ak-ads-ns.prisasd.com/slot/cadenaser/slot.js	49 KB	36 KB (75%)	✓	3rd
https://sdk.mrf.io/statics/marfeel-sdk.js?id=2225	58 KB	30 KB (51%)	✓	3rd
https://sdk.privacy-center.org/sdk/d4911c3d5b4b9a80b40e05167f53d1b1e8da81f3/modern/ui-web-en-web.d4911c3d5b4b9a80b40e05167f53d1b1e8da81f3.js	53 KB	23 KB (43%)	✓	3rd
https://assets.adobedtm.com/0681c221600c/b59a37979c54/c456f8b26b85/RC42fd054bff9a45e6967b09a4e077d7bf-source.min.js	1 KB	—	✓	3rd
https://assets.adobedtm.com/0681c221600c/b59a37979c54/c456f8b26b85/RC58f55a681dcb4254a2f3a472da56ee26-source.min.js	1 KB	—	✓	3rd
https://cadenaser.com/pf/resources/dist/js/main.js?d=1789	11 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

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

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

10 fonts (176 KB)

PASS

10 fonts (176 KB)

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

Web fonts

176 KB total

Render-blocking

of 10

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

roboto-serif-700.woff2 woff2 swap

Size 27 KB

Load time 8 ms

Start 83 ms