Performance
· 15 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.
907 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.98 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
685 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.68 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.
4.26 s
Page Load Progression
FPage Weight BudgetAction2.7 MB transferred, 78 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 BundlesAction43 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/5005-fb93f13cb032b960.js?dpl=dpl_42ZhdrupKm1c1MNy1ynneW52JM8C | 8 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 InventoryAction78 resources · 2.7 MB · 1.7 MB savings availableFIX
~1.7 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 78 resources | 2.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CJS Execution CostAction1916ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.f5.com/_next/static/chunks/549ca77c-9261eb57d3bef9bc.js?dpl=dpl_42ZhdrupKm1c1MNy1ynneW52JM8C | 511ms | 222ms | 283ms | 3rd |
| https://skawa-easyling.cdn.easyling.com/client/63iw3vww/reporter/en-US.js | 307ms | 302ms | 4ms | 3rd |
| https://www.f5.com/_next/static/chunks/1684-c2a4dfbf19bd03d1.js?dpl=dpl_42ZhdrupKm1c1MNy1ynneW52JM8C | 288ms | 254ms | 11ms | 3rd |
| Unattributable | 273ms | 7ms | 0ms | 3rd |
| https://www.f5.com/products/nginx | 262ms | 7ms | 18ms | 3rd |
| https://mktg.tags.f5.com/main/prod/utag.js | 119ms | 94ms | 11ms | 3rd |
| https://mktg.tags.f5.com/main/prod/utag.sync.js | 99ms | 69ms | 21ms | 3rd |
| https://www.f5.com/_next/static/chunks/main-app-d41d56f775a954bb.js?dpl=dpl_42ZhdrupKm1c1MNy1ynneW52JM8C | 57ms | 56ms | 0ms | 3rd |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
AImage Optimization3 images, 0 KB saveablePASS
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 HintsNo optimization neededPASS
Network Waterfall78 requests over 7149msINFO
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 | 511ms | 1583 KB | 98% | €6/mo | Costly |
skawa-easyling.cdn.easyling.com skawa-easyling.cdn.easyling.com | Other | 307ms | 25 KB | — | €3/mo | Costly |
www.f5.com www.f5.com | Other | 288ms | 46 KB | — | €3/mo | Costly |
Unattributable Unattributable | Other | 273ms | 0 KB | — | €3/mo | Costly |
www.f5.com www.f5.com | Other | 262ms | 70 KB | — | €3/mo | Costly |
mktg.tags.f5.com mktg.tags.f5.com | Other | 119ms | 50 KB | 58% | €1/mo | Optional |
mktg.tags.f5.com mktg.tags.f5.com | Other | 99ms | 55 KB | 77% | €1/mo | Optional |
www.f5.com www.f5.com | Other | 57ms | 1 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.f5.com adds 511ms and costs ~€6/month
- skawa-easyling.cdn.easyling.com adds 307ms and costs ~€3/month
- www.f5.com adds 288ms and costs ~€3/month
- Unattributable adds 273ms and costs ~€3/month
- www.f5.com adds 262ms 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.f5.com takes 511ms 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
skawa-easyling.cdn.easyling.com takes 307ms 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 288ms 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 273ms 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 262ms 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
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