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.
1.97 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.50 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.06 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.331
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.57 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.
20.52 s
Page Load Progression
FPage Weight BudgetAction2.8 MB transferred, 85 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 Execution CostAction4774ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.printfriendly.com/_next/static/chunks/6156-05ab41358a4e354b.js?dpl=7fc0b33009f6d516ceb07c25d2104c7339d9ee15 | 1183ms | 1080ms | 39ms | 3rd |
| https://www.printfriendly.com/ | 627ms | 73ms | 53ms | 3rd |
| https://www.printfriendly.com/webviewer/lib/core/webviewer-core.min.js | 589ms | 367ms | 220ms | 3rd |
| Unattributable | 532ms | 53ms | 0ms | 3rd |
| https://cdn.privacy-mgmt.com/unified/wrapperMessagingWithoutDetection.js | 325ms | 308ms | 12ms | 3rd |
| https://www.printfriendly.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 230ms | 218ms | 2ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097946 | 201ms | 144ms | 56ms | 3rd |
| https://a.pub.network/printfriendly-com/prebid.js | 201ms | 155ms | 44ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-DP44EBHX6Z&cx=c>m=4e64m0h2 | 182ms | 140ms | 41ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5PHJ6G | 156ms | 124ms | 28ms | 3rd |
Showing top 10 of 16 scripts
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/m202604170101/pubads_impl.js?cb=31097946 | 187 KB | 145 KB (77%) | ✓ | 3rd |
| https://a.pub.network/printfriendly-com/pubfig.engine.mobile.js | 152 KB | 122 KB (81%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 96 KB | 81 KB (85%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-DP44EBHX6Z&cx=c>m=4e64m0h2 | 165 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 | 122 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 InventoryAction85 resources · 2.8 MB · 1.4 MB savings availableFIX
~1.4 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 85 resources | 2.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization11 images, 0 KB saveableREVIEW
A+Text CompressionAll text resources are compressedPASS
A+Font Loading8 fonts (168 KB)PASS
Web fonts
8
168 KB total
Render-blocking
0
of 8
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+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: Cloudflare
Network Waterfall85 requests over 2678msINFO
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 | 1183ms | 130 KB | 51% | $16/mo | Costly |
www.printfriendly.com www.printfriendly.com | Other | 627ms | 62 KB | — | $8/mo | Costly |
www.printfriendly.com www.printfriendly.com | Other | 589ms | 782 KB | 77% | $8/mo | Costly |
Unattributable Unattributable | Other | 532ms | 0 KB | — | $7/mo | Costly |
cdn.privacy-mgmt.com cdn.privacy-mgmt.com | Other | 325ms | 42 KB | — | $4/mo | Costly |
www.printfriendly.com www.printfriendly.com | Other | 230ms | 0 KB | — | $3/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 201ms | 187 KB | 77% | $3/mo | Costly |
a.pub.network a.pub.network | Other | 201ms | 192 KB | 82% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 182ms | 165 KB | 41% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 156ms | 122 KB | 52% | $2/mo | Optional |
cdn.privacy-mgmt.com cdn.privacy-mgmt.com | Other | 136ms | 35 KB | — | $2/mo | Optional |
a.pub.network a.pub.network | Other | 121ms | 152 KB | 81% | $2/mo | Optional |
www.printfriendly.com www.printfriendly.com | Other | 108ms | 82 KB | 80% | $1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 71ms | 34 KB | — | $1/mo | Optional |
cdn.privacy-mgmt.com cdn.privacy-mgmt.com | Other | 60ms | 25 KB | — | $1/mo | Optional |
a.pub.network a.pub.network | Other | 52ms | 26 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.printfriendly.com adds 1183ms and costs ~$16/month
- www.printfriendly.com adds 627ms and costs ~$8/month
- www.printfriendly.com adds 589ms and costs ~$8/month
- Unattributable adds 532ms and costs ~$7/month
- cdn.privacy-mgmt.com adds 325ms and costs ~$4/month
- www.printfriendly.com adds 230ms and costs ~$3/month
- securepubads.g.doubleclick.net adds 201ms and costs ~$3/month
- a.pub.network adds 201ms 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.printfriendly.com takes 1183ms 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
www.printfriendly.com takes 627ms 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.printfriendly.com takes 589ms 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 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
Unattributable takes 532ms 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
cdn.privacy-mgmt.com takes 325ms 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.printfriendly.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
securepubads.g.doubleclick.net takes 201ms 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 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
a.pub.network takes 201ms 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
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
52% of Google Tag Manager'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
81% 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
80% 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