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.
718 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.27 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
98 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.158
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.24 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.
4.08 s
Page Load Progression
FPage Weight BudgetAction2.8 MB transferred, 88 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction44 scripts, 1.4 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.printfriendly.com/webviewer/lib/core/webviewer-core.min.js | 782 KB | 602 KB (77%) | ✓ | 3rd |
| https://a.pub.network/printfriendly-com/prebid.js | 192 KB | 157 KB (82%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 188 KB | 143 KB (76%) | ✓ | 3rd |
| https://a.pub.network/printfriendly-com/pubfig.engine.js | 153 KB | 123 KB (81%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 96 KB | 72 KB (75%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-DP44EBHX6Z&cx=c>m=4e64k1 | 166 KB | 67 KB (41%) | ✓ | 3rd |
| https://www.printfriendly.com/_next/static/chunks/6156-05ab41358a4e354b.js?dpl=7fc0b33009f6d516ceb07c25d2104c7339d9ee15 | 130 KB | 66 KB (51%) | ✓ | 3rd |
| https://www.printfriendly.com/webviewer/lib/core/pdf/PDFNet.js | 82 KB | 65 KB (80%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5PHJ6G | 123 KB | 63 KB (52%) | ✓ | 3rd |
| https://www.printfriendly.com/_next/static/chunks/1427-e385a848b885ea12.js?dpl=7fc0b33009f6d516ceb07c25d2104c7339d9ee15 | 96 KB | 34 KB (40%) | ✓ | 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 InventoryAction88 resources · 2.8 MB · 1.4 MB savings availableFIX
~1.4 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 88 resources | 2.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization12 images, 0 KB saveableREVIEW
CJS Execution CostAction1091ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.printfriendly.com/_next/static/chunks/6156-05ab41358a4e354b.js?dpl=7fc0b33009f6d516ceb07c25d2104c7339d9ee15 | 310ms | 282ms | 12ms | 3rd |
| https://www.printfriendly.com/ | 170ms | 12ms | 12ms | 3rd |
| https://www.printfriendly.com/webviewer/lib/core/webviewer-core.min.js | 156ms | 100ms | 56ms | 3rd |
| Unattributable | 128ms | 12ms | 0ms | 3rd |
| https://www.printfriendly.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 80ms | 67ms | 3ms | 3rd |
| https://cdn.privacy-mgmt.com/unified/wrapperMessagingWithoutDetection.js | 77ms | 73ms | 3ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 57ms | 43ms | 12ms | 3rd |
| https://a.pub.network/printfriendly-com/prebid.js | 57ms | 45ms | 12ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-DP44EBHX6Z&cx=c>m=4e64k1 | 54ms | 41ms | 12ms | 3rd |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading9 fonts (169 KB)PASS
Web fonts
9
169 KB total
Render-blocking
0
of 9
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
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 ~31 KB and ~62 ms
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 Waterfall88 requests over 2800msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.printfriendly.com www.printfriendly.com | Other | 310ms | 130 KB | 51% | $4/mo | Costly |
www.printfriendly.com www.printfriendly.com | Other | 170ms | 62 KB | — | $2/mo | Optional |
www.printfriendly.com www.printfriendly.com | Other | 156ms | 782 KB | 77% | $2/mo | Optional |
Unattributable Unattributable | Other | 128ms | 0 KB | — | $2/mo | Optional |
www.printfriendly.com www.printfriendly.com | Other | 80ms | 0 KB | — | $1/mo | Optional |
cdn.privacy-mgmt.com cdn.privacy-mgmt.com | Other | 77ms | 42 KB | — | $1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 57ms | 188 KB | 76% | $1/mo | Optional |
a.pub.network a.pub.network | Other | 57ms | 192 KB | 82% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 54ms | 166 KB | 41% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.printfriendly.com adds 310ms 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
www.printfriendly.com takes 310ms 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
51% of www.printfriendly.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 www.printfriendly.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
76% 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
82% of a.pub.network'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