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.
1.53 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.27 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
86 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.120
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.87 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.
3.29 s
Page Load Progression
445 ms 890 ms 1.3 s
1.8 s
2.2 s
2.7 s
3.1 s
3.6 sFPage Weight BudgetAction3.6 MB transferred, 68 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
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 BundlesAction8 scripts, 727 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.smashwords.com/static/dist/js/13.15dd9909.chunk.js | 581 KB | 358 KB (62%) | ✓ | 3rd |
| https://www.smashwords.com/static/dist/js/main.cff9ff76.chunk.js | 194 KB | 146 KB (76%) | ✓ | 3rd |
| https://www.smashwords.com/static/dist/js/react.37d49bfa.chunk.js | 152 KB | 114 KB (75%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-0HDVFTDL0S | 149 KB | 61 KB (41%) | ✓ | 3rd |
| https://www.smashwords.com/static/dist/js/1.13231034.chunk.js | 98 KB | 48 KB (49%) | ✓ | 3rd |
| https://www.smashwords.com/static/dist/js/runtime.7cf3c255.js | 3 KB | — | ✓ | 3rd |
| https://www.smashwords.com/static/dist/js/4.1be4e192.chunk.js | 11 KB | — | ✓ | 3rd |
| https://www.google-analytics.com/analytics.js | 21 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 InventoryAction68 resources · 3.6 MB · 727 KB savings availableFIX
~727.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 68 resources | 3.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization48 images, 0 KB saveableREVIEW
BJS Execution Cost650ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.smashwords.com/static/dist/js/react.37d49bfa.chunk.js | 272ms | 188ms | 11ms | 3rd |
| Unattributable | 118ms | 1ms | 0ms | 3rd |
| https://www.smashwords.com/ | 88ms | 2ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-0HDVFTDL0S | 64ms | 51ms | 10ms | 3rd |
| https://www.smashwords.com/static/dist/js/13.15dd9909.chunk.js | 56ms | 7ms | 45ms | 3rd |
| https://www.smashwords.com/static/dist/js/main.cff9ff76.chunk.js | 52ms | 36ms | 16ms | 3rd |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading1 fonts (61 KB)PASS
Web fonts
1
61 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~18 KB and ~36 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall68 requests over 3567msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.smashwords.com www.smashwords.com | Other | 272ms | 152 KB | 75% | $2/mo | Costly |
Unattributable Unattributable | Other | 118ms | 0 KB | — | $1/mo | Optional |
www.smashwords.com www.smashwords.com | Other | 88ms | 4 KB | — | $0/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 64ms | 149 KB | 41% | $0/mo | Optional |
www.smashwords.com www.smashwords.com | Other | 56ms | 581 KB | 62% | $0/mo | Optional |
www.smashwords.com www.smashwords.com | Other | 52ms | 194 KB | 76% | $0/mo | Optional |
These scripts may cost more than they're worth
- www.smashwords.com adds 272ms and costs ~$2/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.smashwords.com takes 272ms 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
75% of www.smashwords.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
62% of www.smashwords.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 www.smashwords.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