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.
2.90 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.72 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
3.54 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.086
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.29 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.
20.30 s
Page Load Progression
FPage Weight BudgetAction2.6 MB transferred, 76 requestsFIX
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
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction7418ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.f5.com/_next/static/chunks/549ca77c-9261eb57d3bef9bc.js?dpl=dpl_42ZhdrupKm1c1MNy1ynneW52JM8C | 1938ms | 751ms | 1185ms | 3rd |
| https://www.f5.com/_next/static/chunks/1684-c2a4dfbf19bd03d1.js?dpl=dpl_42ZhdrupKm1c1MNy1ynneW52JM8C | 1292ms | 1132ms | 41ms | 3rd |
| https://skawa-easyling.cdn.easyling.com/client/63iw3vww/reporter/en-US.js | 1105ms | 1053ms | 47ms | 3rd |
| Unattributable | 1079ms | 10ms | 0ms | 3rd |
| https://www.f5.com/products/nginx | 695ms | 29ms | 66ms | 3rd |
| https://mktg.tags.f5.com/main/prod/utag.js | 503ms | 354ms | 28ms | 3rd |
| https://mktg.tags.f5.com/main/prod/utag.sync.js | 230ms | 171ms | 28ms | 3rd |
| https://consent.trustarc.com/asset/notice.js/v/v1.7-1729 | 220ms | 161ms | 24ms | 3rd |
| https://consent.trustarc.com/notice?domain=f5.com&c=teconsent&js=nj¬iceType=bb&text=true>m=1 | 118ms | 82ms | 6ms | 3rd |
| https://mktg.tags.f5.com/main/prod/utag.2.js?utv=ut4.48.202512190037 | 102ms | 86ms | 4ms | 3rd |
Showing top 10 of 12 scripts
FJS BundlesAction44 scripts, 1.7 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.f5.com/_next/static/chunks/549ca77c-9261eb57d3bef9bc.js?dpl=dpl_42ZhdrupKm1c1MNy1ynneW52JM8C | 1583 KB | 1554 KB (98%) | ✓ | 3rd |
| https://mktg.tags.f5.com/main/prod/utag.sync.js | 55 KB | 42 KB (77%) | ✓ | 3rd |
| https://www.f5.com/_next/static/chunks/8274-5040ec944eb9c798.js?dpl=dpl_42ZhdrupKm1c1MNy1ynneW52JM8C | 38 KB | 34 KB (90%) | ✓ | 3rd |
| https://mktg.tags.f5.com/main/prod/utag.js | 50 KB | 29 KB (58%) | ✓ | 3rd |
| https://www.f5.com/_next/static/chunks/3564-1cb1b7fade2873c4.js?dpl=dpl_42ZhdrupKm1c1MNy1ynneW52JM8C | 35 KB | 28 KB (81%) | ✓ | 3rd |
| https://consent.trustarc.com/asset/notice.js/v/v1.7-1729 | 36 KB | 22 KB (61%) | ✓ | 3rd |
| https://www.f5.com/_next/static/chunks/1437-d706190bb873963b.js?dpl=dpl_42ZhdrupKm1c1MNy1ynneW52JM8C | 4 KB | — | ✓ | 3rd |
| https://www.f5.com/_next/static/chunks/1543-5d80ae52f1c76152.js?dpl=dpl_42ZhdrupKm1c1MNy1ynneW52JM8C | 4 KB | — | ✓ | 3rd |
| https://www.f5.com/_next/static/chunks/1684-c2a4dfbf19bd03d1.js?dpl=dpl_42ZhdrupKm1c1MNy1ynneW52JM8C | 46 KB | — | ✓ | 3rd |
| https://www.f5.com/_next/static/chunks/9573-177809bccf0da800.js?dpl=dpl_42ZhdrupKm1c1MNy1ynneW52JM8C | 25 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
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
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
FPage Weight InventoryAction76 resources · 2.6 MB · 1.7 MB savings availableFIX
~1.7 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 76 resources | 2.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Image OptimizationNo images on this pagePASS
A+Font Loading11 fonts (253 KB)PASS
Web fonts
11
253 KB total
Render-blocking
0
of 11
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
- 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 ~25 KB and ~50 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints14 hints, 0 missing preconnectsPASS
Current Resource Hints
14 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall76 requests over 8277msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.f5.com www.f5.com | Other | 1938ms | 1583 KB | 98% | €21/mo | Costly |
www.f5.com www.f5.com | Other | 1292ms | 46 KB | — | €14/mo | Costly |
skawa-easyling.cdn.easyling.com skawa-easyling.cdn.easyling.com | Other | 1105ms | 0 KB | — | €12/mo | Costly |
Unattributable Unattributable | Other | 1079ms | 0 KB | — | €12/mo | Costly |
www.f5.com www.f5.com | Other | 695ms | 70 KB | — | €8/mo | Costly |
mktg.tags.f5.com mktg.tags.f5.com | Other | 503ms | 50 KB | 58% | €5/mo | Costly |
mktg.tags.f5.com mktg.tags.f5.com | Other | 230ms | 55 KB | 77% | €2/mo | Costly |
consent.trustarc.com consent.trustarc.com | Other | 220ms | 36 KB | 61% | €2/mo | Costly |
consent.trustarc.com consent.trustarc.com | Other | 118ms | 13 KB | — | €1/mo | Optional |
mktg.tags.f5.com mktg.tags.f5.com | Other | 102ms | 7 KB | — | €1/mo | Optional |
www.f5.com www.f5.com | Other | 74ms | 53 KB | — | €1/mo | Optional |
app.easyling.com app.easyling.com | Other | 62ms | 12 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.f5.com adds 1938ms and costs ~€21/month
- www.f5.com adds 1292ms and costs ~€14/month
- skawa-easyling.cdn.easyling.com adds 1105ms and costs ~€12/month
- Unattributable adds 1079ms and costs ~€12/month
- www.f5.com adds 695ms and costs ~€8/month
- mktg.tags.f5.com adds 503ms and costs ~€5/month
- mktg.tags.f5.com adds 230ms and costs ~€2/month
- consent.trustarc.com adds 220ms and costs ~€2/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.f5.com takes 1938ms 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
98% of www.f5.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
www.f5.com takes 1292ms 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
skawa-easyling.cdn.easyling.com takes 1105ms 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 1079ms 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.f5.com takes 695ms 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
mktg.tags.f5.com takes 503ms 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
58% of mktg.tags.f5.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
mktg.tags.f5.com takes 230ms 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
77% of mktg.tags.f5.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
consent.trustarc.com takes 220ms 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
61% of consent.trustarc.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev