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.
3.30 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
13.54 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.09 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.023
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.31 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.
14.59 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction4724ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://download.cnet.com/ | 885ms | 168ms | 33ms | 3rd |
| Unattributable | 882ms | 77ms | 0ms | 3rd |
| https://bat.bing.com/bat.js | 651ms | 571ms | 4ms | 3rd |
| https://download.cnet.com/statics/assets/oneTrust/scripttemplates/202411.1.0/otBannerSdk.js | 581ms | 471ms | 33ms | 3rd |
| https://download.cnet.com/revamp.js?modern=1 | 321ms | 288ms | 4ms | 3rd |
| https://download.cnet.com/_fs-ch-1T1wmsGaOgGaSxcX/assets/script.js | 264ms | 215ms | 25ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604210101/pubads_impl.js?cb=31098008 | 246ms | 203ms | 41ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-J3Q0P3GWJ9&cx=c>m=4e64k0 | 198ms | 164ms | 33ms | 3rd |
| https://download.cnet.com/prebid-client.js | 129ms | 86ms | 41ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NB5XQQ9V | 128ms | 96ms | 25ms | 3rd |
Showing top 10 of 15 scripts
DJS BundlesAction20 scripts, 444 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604210101/pubads_impl.js?cb=31098008 | 188 KB | 132 KB (71%) | ✓ | 3rd |
| https://download.cnet.com/prebid-client.js | 102 KB | 81 KB (79%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-J3Q0P3GWJ9&cx=c>m=4e64k0 | 160 KB | 67 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NB5XQQ9V | 121 KB | 55 KB (46%) | ✓ | 3rd |
| https://download.cnet.com/statics/assets/oneTrust/scripttemplates/202411.1.0/otBannerSdk.js | 107 KB | 52 KB (49%) | ✓ | 3rd |
| https://www.google.com/adsense/search/ads.js | 43 KB | 32 KB (73%) | ✓ | 3rd |
| https://download.cnet.com/_fs-ch-1T1wmsGaOgGaSxcX/assets/script.js | 205 KB | 25 KB (12%) | ✓ | 3rd |
| https://download.cnet.com/revamp.js?modern=1 | 0 KB | — | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/tag/js/gpt.js | 34 KB | — | ✓ | 3rd |
| https://assets.dwncdn.net/public/boot.30ed61.js | 29 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 InventoryAction108 resources · 1.6 MB · 444 KB savings availableFIX
~443.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 108 resources | 1.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.6 MB transferred, 108 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 Optimization31 images, 0 KB saveableREVIEW
A+Text CompressionAll text resources are compressedPASS
A+Font Loading2 fonts (40 KB)PASS
Web fonts
2
40 KB total
Render-blocking
0
of 2
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)
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints17 hints, 0 missing preconnectsPASS
Current Resource Hints
17 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Google Cloud
Network Waterfall108 requests over 4154msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
download.cnet.com download.cnet.com | Other | 885ms | 47 KB | — | $15/mo | Costly |
Unattributable Unattributable | Other | 882ms | 0 KB | — | $15/mo | Costly |
Bing UET bat.bing.com | Advertising | 651ms | 15 KB | — | $11/mo | Costly |
download.cnet.com download.cnet.com | Other | 581ms | 107 KB | 49% | $10/mo | Costly |
download.cnet.com download.cnet.com | Other | 321ms | 0 KB | — | $6/mo | Costly |
download.cnet.com download.cnet.com | Other | 264ms | 205 KB | 12% | $5/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 246ms | 188 KB | 71% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 198ms | 160 KB | 42% | $3/mo | Optional |
download.cnet.com download.cnet.com | Other | 129ms | 102 KB | 79% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 128ms | 121 KB | 46% | $2/mo | Optional |
assets.dwncdn.net assets.dwncdn.net | Other | 109ms | 2 KB | — | $2/mo | Optional |
btloader.com btloader.com | Other | 104ms | 32 KB | — | $2/mo | Optional |
download.cnet.com download.cnet.com | Other | 81ms | 9 KB | — | $1/mo | Optional |
assets.dwncdn.net assets.dwncdn.net | Other | 74ms | 29 KB | — | $1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 70ms | 34 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- download.cnet.com adds 885ms and costs ~$15/month
- Unattributable adds 882ms and costs ~$15/month
- Bing UET adds 651ms and costs ~$11/month
- download.cnet.com adds 581ms and costs ~$10/month
- download.cnet.com adds 321ms and costs ~$6/month
- download.cnet.com adds 264ms and costs ~$5/month
- securepubads.g.doubleclick.net adds 246ms and costs ~$4/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
download.cnet.com takes 885ms 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 882ms 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
Bing UET takes 651ms 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
download.cnet.com takes 581ms 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
download.cnet.com takes 321ms 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
download.cnet.com takes 264ms 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
securepubads.g.doubleclick.net takes 246ms 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
71% of securepubads.g.doubleclick.net'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
79% of download.cnet.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