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.
5.14 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.01 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
412 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.
5.73 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.
8.02 s
Page Load Progression
DPage Weight BudgetAction2.4 MB transferred, 65 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
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.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
BImage Optimization27 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
CJS Execution CostAction1660ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.redhat.com/ma/dpal.js | 494ms | 267ms | 203ms | 3rd |
| Unattributable | 455ms | 28ms | 0ms | 3rd |
| https://opensource.com/ | 228ms | 1ms | 0ms | 1st |
| https://consent.trustarc.com/notice?c=teconsent&domain=redhat2.com>m=1&js=nj¬iceType=bb&privacypolicylink=https%3A%2F%2Fwww.redhat.com%2Fen%2Fabout%2Fprivacy-policy&text=true | 203ms | 144ms | 1ms | 3rd |
| https://opensource.com/sites/default/files/js/js_qgp1hJtRopt0_BeP4SC5ao8KRG5al8MAxKSuQPvkAEA.js?scope=footer&delta=0&language=en&theme=osdc&include=eJxNjtEOwjAIRX-oXT-pYRQ3JitNS-bm10s0Rh9ITg73EgoYCFzU807mvCRsZ-7UtJtL1L1ppWqhr86Fjlw8ld-VhFrNd5GN9ojCeKcSdBRMi-gMEg6mx8hcb1w9kwd2FUlvG782fuynB90YhaIRDOphFnheaWadYIMzoBYalVsjS388rbys4mPb-P0JFeTyayOVBvIC0tdbeA | 99ms | 77ms | 18ms | 1st |
| https://opensource.com/themes/osdc/node_modules/%40patternfly/pfelement/dist/pfelement.min.js | 93ms | 49ms | 0ms | 1st |
| https://consent.trustarc.com/asset/notice.js/v/v1.7-1729 | 87ms | 62ms | 9ms | 3rd |
BJS Bundles21 scripts, 80 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://opensource.com/sites/default/files/js/js_qgp1hJtRopt0_BeP4SC5ao8KRG5al8MAxKSuQPvkAEA.js?scope=footer&delta=0&language=en&theme=osdc&include=eJxNjtEOwjAIRX-oXT-pYRQ3JitNS-bm10s0Rh9ITg73EgoYCFzU807mvCRsZ-7UtJtL1L1ppWqhr86Fjlw8ld-VhFrNd5GN9ojCeKcSdBRMi-gMEg6mx8hcb1w9kwd2FUlvG782fuynB90YhaIRDOphFnheaWadYIMzoBYalVsjS388rbys4mPb-P0JFeTyayOVBvIC0tdbeA | 68 KB | 46 KB (68%) | ✓ | 1st |
| https://www.redhat.com/ma/dpal.js | 225 KB | 34 KB (15%) | ✓ | 3rd |
| https://consent.trustarc.com/notice?c=teconsent&domain=redhat2.com>m=1&js=nj¬iceType=bb&privacypolicylink=https%3A%2F%2Fwww.redhat.com%2Fen%2Fabout%2Fprivacy-policy&text=true | 7 KB | — | ✓ | 3rd |
| https://assets.adobedtm.com/c5eace8ae526/5b49792348cf/e84070d36ab5/RC43ec6a0e66084335bcf8716b5940960f-source.min.js | 1 KB | — | ✓ | 3rd |
| https://opensource.com/themes/osdc/node_modules/%40patternfly/pfe-avatar/dist/pfe-avatar.min.js?sqka6y | 3 KB | — | ✓ | 1st |
| https://opensource.com/sites/default/files/js/js_Vs1jklihE74Lmh50K_QZN26KPvA_Q49pCnF9Sshashw.js?scope=footer&delta=2&language=en&theme=osdc&include=eJxNjtEOwjAIRX-oXT-pYRQ3JitNS-bm10s0Rh9ITg73EgoYCFzU807mvCRsZ-7UtJtL1L1ppWqhr86Fjlw8ld-VhFrNd5GN9ojCeKcSdBRMi-gMEg6mx8hcb1w9kwd2FUlvG782fuynB90YhaIRDOphFnheaWadYIMzoBYalVsjS388rbys4mPb-P0JFeTyayOVBvIC0tdbeA | 35 KB | — | ✓ | 1st |
| https://opensource.com/libraries/chapeaux--cpx-reporter/reporter.js | 2 KB | — | ✓ | 1st |
| https://static.redhat.com/libs/redhat/marketing/latest/trustarc/trustarc.js | 2 KB | — | ✓ | 3rd |
| https://opensource.com/themes/osdc/node_modules/@patternfly/pfelement/dist/pfelement.min.js | 5 KB | — | ✓ | 1st |
| https://opensource.com/themes/osdc/node_modules/%40patternfly/pfelement/dist/pfelement.min.js | 5 KB | — | ✓ | 1st |
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
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
CPage Weight InventoryAction65 resources · 2.4 MB · 80 KB savings availableREVIEW
~79.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 65 resources | 2.4 MiB | ||||||
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
AThird-Party Impact24% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (110 KB)PASS
Web fonts
4
110 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 ~13 KB and ~26 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+HTTP Cachingmax-age=30 (30 seconds)PASS
max-age=30
| Directive | Value | Meaning |
|---|---|---|
| max-age | 30 | Cache for 30 seconds |
Network Waterfall65 requests over 1475msINFO
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 | 494ms | 225 KB | 15% | $7/mo | Costly |
Unattributable Unattributable | Other | 455ms | 0 KB | — | $6/mo | Costly |
consent.trustarc.com consent.trustarc.com | Other | 203ms | 7 KB | — | $3/mo | Costly |
consent.trustarc.com consent.trustarc.com | Other | 87ms | 36 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.redhat.com adds 494ms and costs ~$7/month
- Unattributable adds 455ms and costs ~$6/month
- consent.trustarc.com adds 203ms and costs ~$3/month
75% 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 494ms 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 455ms 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 203ms 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