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.

910 ms

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

2.15 s

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

26 ms

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

0.016

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

1.50 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.

2.30 s

Page Load Progression

376 ms

752 ms

1.1 s

1.5 s

1.9 s

2.3 s

2.6 s

3.0 s

Checks

6 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 (1.9 MiB of 1.9 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

Page Weight Inventory

Action

131 resources · 1.9 MB · 33 KB savings available

FIX

131 resources · 1.9 MB · 33 KB savings available

Page weight 934 KB over 1MB target

Got: 1.9 MB Expected: ≤ 1 MB

130 third-party resources (100% of weight)

1 resources over 200KB

131 resources · 1.9 MiB · 130 third-party 934.5 KiB over 1MB target

Image 47% · 917.4 KiB

JavaScript 33% · 640.9 KiB

Font 9% · 179.3 KiB

Document 5% · 96.2 KiB

Other 4% · 80.2 KiB

CSS 2% · 44.4 KiB

~32.5 KiB of savings available

Remove unused JavaScript: 32.5 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

131 resources			1.9 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

1.9 MB transferred, 131 requests

REVIEW

1.9 MB transferred, 131 requests

Page weighs 6.4 MB (1.9 MB transferred)

JavaScript is 641 KB — consider code splitting or lazy loading

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

Got: 641 KB

131 HTTP requests — consider bundling or reducing

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

Estimated 0.40 g CO2 per page load

1.9 MB transferred

131 requests

0.40 g CO2 per page load

Images 913.9 KiB 47%

JavaScript 640.9 KiB 33%

Fonts 179.3 KiB 9%

HTML 95.4 KiB 5%

Other 74.5 KiB 4%

CSS 44.4 KiB 2%

Other 6.4 KiB 0%

Other 3.6 KiB 0%

0 2.4 MB 4.9 MB

Approaching limit

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

37 images, 0 KB saveable

REVIEW

37 images, 0 KB saveable

All images are well-optimized

37 images 914 KB

0 oversized -0 KB

14 legacy format

0 missing dimensions CLS risk

JS Execution Cost

947ms total JS execution

REVIEW

947ms total JS execution

https://www.redhat.com/en: 416ms CPU time

Unattributable: 245ms CPU time

https://www.redhat.com/dtm.js: 129ms CPU time

https://consent.trustarc.com/asset/notice.js/v/v1....: 99ms CPU time

https://consent.trustarc.com/notice?c=teconsent&pc...: 58ms CPU time

Third-party scripts: 947ms (100% of total)

Main Thread Breakdown

Other 31% Script Evaluation 28% Style & Layout 21% Rendering 7% Script Parsing & Compilation 5% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
https://www.redhat.com/en	416ms	11ms	2ms	3rd
Unattributable	245ms	18ms	0ms	3rd
https://www.redhat.com/dtm.js	129ms	65ms	49ms	3rd
https://consent.trustarc.com/asset/notice.js/v/v1.7-1729	99ms	42ms	5ms	3rd
https://consent.trustarc.com/notice?c=teconsent&pcookie&domain=redhat.com&gtm=1&js=nj&noticeType=bb&privacypolicylink=https%3A%2F%2Fwww.redhat.com%2Fen%2Fabout%2Fprivacy-policy&text=true	58ms	39ms	1ms	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

6 fonts (179 KB)

PASS

6 fonts (179 KB)

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

Web fonts

179 KB total

Render-blocking

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

RedHatTextVFModified.woff2 woff2 swap

Size 30 KB

Load time 61 ms

Start 400 ms