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.
724 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.29 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
140 ms
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.
1.29 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.
4.89 s
Page Load Progression
DPage Weight BudgetAction2.5 MB transferred, 150 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
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
DThird-Party ImpactAction88% third-party, 0 ms blockingFIX
FJS BundlesAction40 scripts, 969 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.ziffstatic.com/pg/downdetector.prebid.js | 232 KB | 154 KB (66%) | ✓ | 3rd |
| https://cdn.ziffstatic.com/pg/downdetector.prebid.js | 0 KB | 154 KB (66%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 188 KB | 121 KB (64%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-0PZM58H213&cx=c>m=4e64m0h2 | 153 KB | 106 KB (69%) | ✓ | 3rd |
| https://cdn3.downdetector.com/_next/static/chunks/2037-4989b8c4c5d0e6a7.js?dpl=f019186ee39f3b58fbf245211786b16579e1a832 | 125 KB | 77 KB (61%) | ✓ | 3rd |
| https://cdn.ziffstatic.com/jst/otBannerSdk.202512.1.0.js | 126 KB | 74 KB (59%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=G-0PZM58H213&cx=c>m=4e64m0h2 | 153 KB | 62 KB (40%) | ✓ | 3rd |
| https://openads-cdn.adsrvr.org/openadsjs/build/v1.0/ziffdavis/openads.js | 90 KB | 60 KB (67%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WS2HF4K | 129 KB | 56 KB (44%) | ✓ | 3rd |
| https://client.aps.amazon-adsystem.com/publisher.js | 83 KB | 49 KB (60%) | ✓ | 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 InventoryAction150 resources · 2.5 MB · 969 KB savings availableFIX
~969.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 150 resources | 2.5 MiB | ||||||
BImage Optimization50 images, 0 KB saveableREVIEW
CJS Execution CostAction1849ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://cdn3.downdetector.com/_next/static/chunks/2037-4989b8c4c5d0e6a7.js?dpl=f019186ee39f3b58fbf245211786b16579e1a832 | 370ms | 327ms | 16ms | 3rd |
| https://downdetector.com/ | 302ms | 19ms | 13ms | 1st |
| Unattributable | 225ms | 34ms | 0ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 156ms | 116ms | 20ms | 3rd |
| https://cdn3.downdetector.com/_next/static/chunks/app/%5Bdomain%5D/%5Blocale%5D/(home)/page-3dc2aa5e385bcb6c.js?dpl=f019186ee39f3b58fbf245211786b16579e1a832 | 116ms | 16ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=G-0PZM58H213&cx=c>m=4e64m0h2 | 110ms | 91ms | 17ms | 3rd |
| https://cdn.ziffstatic.com/jst/otBannerSdk.202512.1.0.js | 107ms | 67ms | 20ms | 3rd |
| https://cdn.ziffstatic.com/pg/downdetector.prebid.js | 105ms | 70ms | 32ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WS2HF4K | 79ms | 65ms | 13ms | 3rd |
| https://cdn.ziffstatic.com/jst/otGPP.202512.1.0.js | 78ms | 71ms | 5ms | 3rd |
Showing top 10 of 13 scripts
BHTTP Cachingpublic, max-age=0, s-maxage=90, stale-while-revalidate=180REVIEW
public, max-age=0, s-maxage=90, stale-while-revalidate=180
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 0 | Cache for 0 seconds |
| s-maxage | 90 | CDN caches for 1 minute |
| stale-while-revalidate | 180 | Serve stale for 3 minutes while fetching fresh |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (138 KB)PASS
Web fonts
4
138 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)
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall150 requests over 4858msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
cdn3.downdetector.com cdn3.downdetector.com | Other | 370ms | 125 KB | 61% | $5/mo | Costly |
Unattributable Unattributable | Other | 225ms | 0 KB | — | $3/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 156ms | 188 KB | 64% | $2/mo | Optional |
cdn3.downdetector.com cdn3.downdetector.com | Other | 116ms | 13 KB | — | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 110ms | 153 KB | 40% | $1/mo | Optional |
cdn.ziffstatic.com cdn.ziffstatic.com | Other | 107ms | 126 KB | 59% | $1/mo | Optional |
cdn.ziffstatic.com cdn.ziffstatic.com | Other | 105ms | 0 KB | 66% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 79ms | 129 KB | 44% | $1/mo | Optional |
cdn.ziffstatic.com cdn.ziffstatic.com | Other | 78ms | 22 KB | — | $1/mo | Optional |
cdn.ziffstatic.com cdn.ziffstatic.com | Other | 76ms | 28 KB | — | $1/mo | Optional |
client.aps.amazon-adsystem.com client.aps.amazon-adsystem.com | Other | 73ms | 83 KB | 60% | $1/mo | Optional |
openads-cdn.adsrvr.org openads-cdn.adsrvr.org | Other | 54ms | 90 KB | 67% | $1/mo | Optional |
These scripts may cost more than they're worth
- cdn3.downdetector.com adds 370ms and costs ~$5/month
- Unattributable adds 225ms and costs ~$3/month
84% 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
cdn3.downdetector.com takes 370ms 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 cdn3.downdetector.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
Unattributable takes 225ms 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
64% 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
59% of cdn.ziffstatic.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
66% of cdn.ziffstatic.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
60% of client.aps.amazon-adsystem.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
67% of openads-cdn.adsrvr.org'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