Performance

· 22 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.

1.28 s

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

3.53 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.

0.001

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

3.98 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.

3.53 s

Page Load Progression

642 ms

1.3 s

1.9 s

2.6 s

3.2 s

3.9 s

4.5 s

5.1 s

Checks

12 PASS 6 REVIEW 1 FIX

Page Weight Budget

Action

19.1 MB transferred, 126 requests

FIX

19.1 MB transferred, 126 requests

Page weighs 21.7 MB (19.1 MB transferred)

Images are 17.9 MB — compress or use modern formats

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

Got: 17.9 MB

JavaScript is 668 KB — consider code splitting or lazy loading

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

Got: 668 KB

126 HTTP requests — consider bundling or reducing

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

Estimated 4.0 g CO2 per page load

19.1 MB transferred

126 requests

4.0 g CO2 per page load

Images 17.9 MiB 94%

JavaScript 668.1 KiB 3%

Other 157.3 KiB 1%

HTML 141.5 KiB 1%

Fonts 113.1 KiB 1%

Other 73.5 KiB 0%

CSS 71.6 KiB 0%

Other 4.7 KiB 0%

Other 963 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

Image Optimization

52 images, 0 KB saveable

REVIEW

52 images, 0 KB saveable

https://onlinenews.ie/wp-content/uploads/2026/01/l... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

52 images 17.9 MB

0 oversized -0 KB

49 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

Action

1293ms total JS execution

REVIEW

1293ms total JS execution

Unattributable: 392ms CPU time

https://onlinenews.ie/: 380ms CPU time

https://onlinenews.ie/wp-content/themes/news-magaz...: 250ms CPU time

https://onlinenews.ie/wp-includes/js/jquery/jquery...: 176ms CPU time

https://platform.twitter.com/widgets.js: 95ms CPU time

Third-party scripts: 95ms (7% of total)

Main Thread Breakdown

Other 41% Style & Layout 22% Script Evaluation 19% Rendering 11% Parse HTML & CSS 3%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	392ms	5ms	0ms	1st
https://onlinenews.ie/	380ms	5ms	2ms	1st
https://onlinenews.ie/wp-content/themes/news-magazine-x/assets/lib/swiper/swiper.min.js?ver=11.0.3	250ms	47ms	8ms	1st
https://onlinenews.ie/wp-includes/js/jquery/jquery.min.js?ver=3.7.1	176ms	87ms	4ms	1st
https://platform.twitter.com/widgets.js	95ms	74ms	13ms	3rd

Server-Timing Observability

No Server-Timing header found

REVIEW

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.

Page Weight Inventory

Action

126 resources · 19.1 MB · 23 KB savings available

REVIEW

126 resources · 19.1 MB · 23 KB savings available

Page weight 19.1 MB exceeds 1 MB target by 18.1 MB

Got: 19.1 MB Expected: ≤ 1 MB

50 third-party resources (5% of weight)

18 resources over 200KB

126 resources · 19.1 MiB · 50 third-party 18.1 MiB over 1MB target

Image 94% · 17.9 MiB

JavaScript 3% · 668.1 KiB

Media 1% · 214.4 KiB

Document 1% · 141.5 KiB

Font 1% · 113.1 KiB

CSS 0% · 71.6 KiB

Other 0% · 17.3 KiB

~23.1 KiB of savings available

Remove unused JavaScript: 23.1 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

126 resources			19.1 MiB

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

HTTP Caching

public, max-age=0

REVIEW

public, max-age=0

Cache-Control header is set

Got: public, max-age=0

ETag present — enables conditional (304) responses

Cache-Control

public, max-age=0

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	0	Cache for 0 seconds

A+

Third-Party Impact

5% third-party, 0 ms blocking

PASS

5% third-party, 0 ms blocking

Third-party code accounts for 5% of page weight (1.0 MiB of 19.1 MiB)

Third-party blocking time is low (0 ms)

95%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

6 fonts (113 KB)

PASS

6 fonts (113 KB)

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

Web fonts

113 KB total

Render-blocking

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

j8_46_LD37rqfuwxyIuaZhE... woff2 swap

Size 16 KB

Load time 20 ms

Start 713 ms