Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
3.18 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.07 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
410 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.128
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.50 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.
10.88 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction4099ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.redhat.com/en | 1499ms | 23ms | 5ms | 3rd |
| Unattributable | 964ms | 60ms | 0ms | 3rd |
| https://www.redhat.com/dtm.js | 628ms | 347ms | 216ms | 3rd |
| https://consent.trustarc.com/asset/notice.js/v/v1.7-1729 | 388ms | 195ms | 16ms | 3rd |
| https://consent.trustarc.com/notice?c=teconsent&pcookie&domain=redhat.com>m=1&js=nj¬iceType=bb&privacypolicylink=https%3A%2F%2Fwww.redhat.com%2Fen%2Fabout%2Fprivacy-policy&text=true | 209ms | 146ms | 2ms | 3rd |
| https://www.redhat.com/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4.0.2/context-4.0.2.js | 136ms | 131ms | 0ms | 3rd |
| https://www.redhat.com/akam/13/3ea9019d | 104ms | 95ms | 4ms | 3rd |
| https://www.redhat.com/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4.0.2/lit-html-4.0.2.js | 63ms | 52ms | 0ms | 3rd |
| https://www.redhat.com/modules/contrib/rh_oidc_manager/libraries/dist/js/index.min.js?tc3usf | 57ms | 17ms | 1ms | 3rd |
| https://www.redhat.com/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4.0.2/lit-ssr/lit-ssr.js | 52ms | 42ms | 0ms | 3rd |
DPage Weight InventoryAction122 resources · 1.7 MB · 33 KB savings availableFIX
~32.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 122 resources | 1.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.7 MB transferred, 122 requestsREVIEW
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
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.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
BImage Optimization28 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (122 KB)PASS
Web fonts
4
122 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- 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 ~18 KB and ~36 ms
A+JS Bundles68 scripts, 33 KB unusedPASS
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.redhat.com/dtm.js | 279 KB | 33 KB (12%) | ✓ | 3rd |
| https://static.redhat.com/libs/redhat/marketing/latest/trustarc/trustarc.js | 2 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=eJyNkcGOwyAMRH-oNF-zZ2TAAm9N6NpOd7NfXyup1Esi9QJ45mmsEYIlNrCoDcSfTEknhv818IASUPsoC2NI7l7kiCUL-HdHoY6zAQdVOQSlBXiAwambDc6sGR5UwWjM4e6LQNYz0qCeWsTvCgZJI8M6Fpv2a5Mu0uKgkmOHGSrKlAXBcNcyk1d0pOTJczzmS1Fesx9B0QLDXEMe40a4OdGDeDXKujHXfrN6_dYj7z1GLIVjGmajf0KiyJBPQCUvowiS2477py07-VJ_MUmb0s8TujvRHw | 1 KB | — | ✓ | 3rd |
| https://www.redhat.com/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4.0.2/lit-ssr/lit-ssr.js | 3 KB | — | ✓ | 3rd |
| https://www.redhat.com/modules/contrib/rh_oidc_manager/libraries/dist/js/index.min.js?tc3usf | 18 KB | — | ✓ | 3rd |
| https://www.redhat.com/rhdc/system-files/js/js__4sbVnURWLTULvspHSi9iNdc8pvHn7TKfgHcjy63fng.js?scope=footer&delta=0&language=en&theme=rhdc&include=eJyNkcGOwyAMRH-oNF-zZ2TAAm9N6NpOd7NfXyup1Esi9QJ45mmsEYIlNrCoDcSfTEknhv818IASUPsoC2NI7l7kiCUL-HdHoY6zAQdVOQSlBXiAwambDc6sGR5UwWjM4e6LQNYz0qCeWsTvCgZJI8M6Fpv2a5Mu0uKgkmOHGSrKlAXBcNcyk1d0pOTJczzmS1Fesx9B0QLDXEMe40a4OdGDeDXKujHXfrN6_dYj7z1GLIVjGmajf0KiyJBPQCUvowiS2477py07-VJ_MUmb0s8TujvRHw | 3 KB | — | ✓ | 3rd |
| https://www.redhat.com/modules/contrib/red_hat_shared_libs/dist/js/lazy-load-esmodule.bare-imports.js?v=7.0.6 | 1 KB | — | ✓ | 3rd |
| https://www.redhat.com/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4.0.2/rh-avatar/rh-avatar.js | 2 KB | — | ✓ | 3rd |
| https://www.redhat.com/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4.0.2/rh-cta/rh-cta.js | 3 KB | — | ✓ | 3rd |
| https://www.redhat.com/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4.0.2/rh-navigation-primary/rh-navigation-primary.js | 8 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints4 hints, 0 missing preconnectsPASS
Current Resource Hints
4 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall122 requests over 5046msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.redhat.com www.redhat.com | Other | 1499ms | 89 KB | — | $20/mo | Costly |
Unattributable Unattributable | Other | 964ms | 0 KB | — | $13/mo | Costly |
www.redhat.com www.redhat.com | Other | 628ms | 279 KB | 12% | $8/mo | Costly |
consent.trustarc.com consent.trustarc.com | Other | 388ms | 36 KB | — | $5/mo | Costly |
consent.trustarc.com consent.trustarc.com | Other | 209ms | 7 KB | — | $3/mo | Costly |
www.redhat.com www.redhat.com | Other | 136ms | 1 KB | — | $2/mo | Optional |
www.redhat.com www.redhat.com | Other | 104ms | 10 KB | — | $1/mo | Optional |
www.redhat.com www.redhat.com | Other | 63ms | 3 KB | — | $1/mo | Optional |
www.redhat.com www.redhat.com | Other | 57ms | 18 KB | — | $1/mo | Optional |
www.redhat.com www.redhat.com | Other | 52ms | 3 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.redhat.com adds 1499ms and costs ~$20/month
- Unattributable adds 964ms and costs ~$13/month
- www.redhat.com adds 628ms and costs ~$8/month
- consent.trustarc.com adds 388ms and costs ~$5/month
- consent.trustarc.com adds 209ms and costs ~$3/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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.redhat.com takes 1499ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 964ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.redhat.com takes 628ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
consent.trustarc.com takes 388ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
consent.trustarc.com takes 209ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev