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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
88
GRADE
B
FIX
1
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
93
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

881 ms

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

1.48 s

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

34 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.

1.34 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.

1.77 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
14
7 PASS 4 REVIEW 1 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (1.0 MiB of 1.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
C
Image Optimization
Action
14 images, 0 KB saveable
REVIEW
14 images, 0 KB saveable
Warning::
https://www.redhat.com/rhdc/managed-files/Logo-Red... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.redhat.com/rhdc/managed-files/logo-Red... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://redhat.com/rhdc/managed-files/ansible-logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
14 images 62 KB
0 oversized -0 KB
11 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

B
JS Execution Cost
517ms total JS execution
REVIEW
517ms total JS execution
Info::
Unattributable: 187ms CPU time
Info::
https://www.redhat.com/dtm.js: 153ms CPU time
Info::
https://www.redhat.com/en/ansible-collaborative?in...: 116ms CPU time
Info::
https://www.redhat.com/akam/13/3ea9008a: 62ms CPU time
Warning::
Third-party scripts: 517ms (100% of total)

Main Thread Breakdown

Script Evaluation 39% Other 29% Style & Layout 11% Script Parsing & Compilation 10% Garbage Collection 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable187ms5ms0ms3rd
https://www.redhat.com/dtm.js153ms84ms60ms3rd
https://www.redhat.com/en/ansible-collaborative?intcmp=7015Y000003t7aWQAQ116ms5ms1ms3rd
https://www.redhat.com/akam/13/3ea9008a62ms57ms1ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0
REVIEW
max-age=0
Info::
Cache-Control header is set
Got: max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0

DirectiveValueMeaning
max-age0Cache for 0 seconds
A
Page Weight Budget
1.0 MB transferred, 86 requests
PASS
1.0 MB transferred, 86 requests
Info::
Page weighs 5.1 MB (1.0 MB transferred)
Warning::
JavaScript is 648 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 648 KB
Info::
86 HTTP requests
Info::
Estimated 0.22 g CO2 per page load
1.0 MB / 2.4 MB budget
1.0 MB transferred
86 requests
0.22 g CO2 per page load
JavaScript 648.2 KiB 61%
Fonts 147.8 KiB 14%
CSS 75.3 KiB 7%
Other 74.7 KiB 7%
Images 61.7 KiB 6%
HTML 43.9 KiB 4%
Other 3.2 KiB 0%
Other 1.9 KiB 0%
0 2.4 MB 4.9 MB
Under budget

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

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
5 fonts (148 KB)
PASS
5 fonts (148 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

148 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 881 ms LCP 1.5 shttps://www.redhat.com/themes/custom/rhdc/src/fonts/red_hat_text/RedHatTextVFModified.woff2RedHatTextVFModified.woff2 https://www.redhat.com/themes/custom/rhdc/src/fonts/red_hat_text/RedHatTextVFModified.woff2 — 29.8 KiB — 0 ms — font-display: swaphttps://www.redhat.com/themes/custom/rhdc/src/fonts/red_hat_display/RedHatDisplayVFModified.woff2RedHatDisplayVFModified... https://www.redhat.com/themes/custom/rhdc/src/fonts/red_hat_display/RedHatDisplayVFModified.woff2 — 30.5 KiB — 0 ms — font-display: swaphttps://consent.trustarc.com/get?name=RedHatDisplay-Medium.ttfget https://consent.trustarc.com/get?name=RedHatDisplay-Medium.ttf — 26.0 KiB — 0 ms — font-display: swaphttps://consent.trustarc.com/get?name=RedHatText-Regular.ttfget https://consent.trustarc.com/get?name=RedHatText-Regular.ttf — 35.6 KiB — 0 ms — font-display: swaphttps://consent.trustarc.com/get?name=RedHatDisplay-Bold.ttfget https://consent.trustarc.com/get?name=RedHatDisplay-Bold.ttf — 25.9 KiB — 0 ms — font-display: swap
RedHatTextVFModified.woff2 woff2 swap
Size 30 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
RedHatDisplayVFModified... woff2 swap
Size 30 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
get ttf swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
get ttf swap
Size 36 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
get ttf swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~26 KB and ~52 ms

A+
JS Bundles
48 scripts, 33 KB unused
PASS
48 scripts, 33 KB unused
Warning::
https://www.redhat.com/dtm.js: 33 KB unused (12%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 33 KB
33 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.redhat.com/dtm.js279 KB33 KB (12%)✓3rd
https://static.redhat.com/libs/redhat/marketing/latest/trustarc/trustarc.js2 KB—✓3rd
https://static.redhat.com/libs/redhat/marketing/latest/trustarc/trustecm/js/trustecm.js6 KB—✓3rd
https://www.redhat.com/rhdc/system-files/js/js_3EBBi-lqpBgQp15IKX1Ys6Y9R67WCsumS2He-mQ_VBo.js?scope=header&delta=0&language=en&theme=rhdc&include=eJyNjsEOwyAMQ3-olE-K0hABLRA1ZJv696PdpF126MWy42cpJMp-3R-sx6QcIKFBT3jakpfuNbmGzxzRsjTXmaQFPNkEkgNBxYaR1ZMyGn9uVDI3G0ggf8qYmSvYoiORLfPVwBiWwzL1i5nrZnFe-7_uF4FDKLCImdQ7JKuK3gF7Hs93RqU0vXjR5Jf9ayxxZTCJsfAbzRN2aw1 KB—✓3rd
https://www.redhat.com/modules/contrib/rh_oidc_manager/libraries/dist/js/index.min.js?tc3usf18 KB—✓3rd
https://static.redhat.com/libs/@redhat/marketing/latest/rh.mktg.js8 KB—✓3rd
https://www.redhat.com/akam/13/3ea9008a10 KB—✓3rd
https://www.redhat.com/rhdc/system-files/js/js_x7AV8xKBMkRduTVGqWwnaCiSYU7tHx3x7tKdS9tAsjU.js?scope=footer&delta=0&language=en&theme=rhdc&include=eJyNjsEOwyAMQ3-olE-K0hABLRA1ZJv696PdpF126MWy42cpJMp-3R-sx6QcIKFBT3jakpfuNbmGzxzRsjTXmaQFPNkEkgNBxYaR1ZMyGn9uVDI3G0ggf8qYmSvYoiORLfPVwBiWwzL1i5nrZnFe-7_uF4FDKLCImdQ7JKuK3gF7Hs93RqU0vXjR5Jf9ayxxZTCJsfAbzRN2aw32 KB—✓3rd
https://www.redhat.com/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4.0.2/rh-navigation-secondary/rh-navigation-secondary.js6 KB—✓3rd
https://www.redhat.com/rhdc/system-files/js/js_2DwTifLjtK-XlwR7OPObPMh8ClRBE7fhSACLxhFnZxo.js?scope=footer&delta=2&language=en&theme=rhdc&include=eJyNjsEOwyAMQ3-olE-K0hABLRA1ZJv696PdpF126MWy42cpJMp-3R-sx6QcIKFBT3jakpfuNbmGzxzRsjTXmaQFPNkEkgNBxYaR1ZMyGn9uVDI3G0ggf8qYmSvYoiORLfPVwBiWwzL1i5nrZnFe-7_uF4FDKLCImdQ7JKuK3gF7Hs93RqU0vXjR5Jf9ayxxZTCJsfAbzRN2aw1 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
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
86 requests over 0ms
INFO

Performance analysis not available for this result.

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 517ms · 329KB · $7/mo
Unattributable
Other
Optional
Execution 187ms
Transfer 0 KB
Monthly Cost $2/mo
www.redhat.com
Other
Optional
Execution 153ms
Transfer 279 KB
Unused 12%
Monthly Cost $2/mo
www.redhat.com
Other
Optional
Execution 116ms
Transfer 40 KB
Monthly Cost $2/mo
www.redhat.com
Other
Optional
Execution 62ms
Transfer 10 KB
Monthly Cost $1/mo

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

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.

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