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.
2.86 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
5.22 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.87 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.
5.28 s
Page Load Progression
FPage Weight BudgetAction5.6 MB transferred, 79 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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction12 scripts, 1.2 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.igi-global.com/bundles/js/bookstore?v=txakjgrmvtg3dpg8mjb-jkht0mub4mn9g-wh8wlhfow1 | 1381 KB | 1024 KB (74%) | ✗ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-4Y3CX4YME3 | 167 KB | 66 KB (39%) | ✓ | 3rd |
| https://www.igi-global.com/Scripts/external/2025/jquery-3.7.1.js | 83 KB | 62 KB (75%) | ✗ | 3rd |
| https://www.igi-global.com/Scripts/external/bootstrap/bootstrap-5.3.7-dist/js/bootstrap.bundle.js | 44 KB | 33 KB (75%) | ✗ | 3rd |
| https://www.igi-global.com/WebResource.axd?d=pynGkmcFUV13He1Qd6_TZPmWIJVCCio-VoI6UnxNfXMaVvGMFhCa3dM7UN6i8k0G8WmiNg2&t=638901382312636832 | 23 KB | 22 KB (98%) | ✗ | 3rd |
| https://www.igi-global.com/ScriptResource.axd?d=nv7asgRUU0tRmHNR2D6t1C7Uy6VRPLvoS3lBxyvpzyglauuMRPWzbFcHIDQkx_uyLKVhyUKIybHHyw9BycWdu8AdgmL2K8Tz5PMoehSkNJFIBVtc0iIrilefkZ00hcLjp8P4Gw2&t=40d12516 | 6 KB | — | ✓ | 3rd |
| https://www.igi-global.com/ScriptResource.axd?d=NJmAwtEo3Ipnlaxl6CMhvkql_yXEPqA7jqG-7jGHaSvhvs_RpwySgMPJKAUwP0h3uxo4Ov7pKanKUHi9umNbxWo2h4t2E24h16BB22kt-kpvksfBf6Xv_3h9MKpX2Ofkvj3HsEO1kKj0SJOTspQATQT-Vs41&t=345ad968 | 25 KB | — | ✓ | 3rd |
| https://www.igi-global.com/ScriptResource.axd?d=dwY9oWetJoJoVpgL6Zq8OKoo7b305hGqSpT-EZmH6r2lHn47af1fQSCc7WzoA_AP_eLvyR12P9iZ6sRD16Ojg_3jYrR8_DrKfgynnYiPyk4F-ElGRjnK3wTfLCsHMBY3pyEu3Afa_Eutb173DHGK-dRfLjo1&t=345ad968 | 10 KB | — | ✓ | 3rd |
| https://www.igi-global.com/includes/currency.js | 3 KB | — | ✓ | 3rd |
| https://js.zi-scripts.com/zi-tag.js | 6 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 InventoryAction79 resources · 5.6 MB · 1.2 MB savings availableFIX
~1.2 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 79 resources | 5.6 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
no-store
| Directive | Value | Meaning |
|---|---|---|
| no-store | — | Never cache this response |
CImage OptimizationAction54 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+JS Execution Cost414ms total JS executionPASS
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.igi-global.com/bundles/js/bookstore?v=txakjgrmvtg3dpg8mjb-jkht0mub4mn9g-wh8wlhfow1 | 212ms | 105ms | 39ms | 3rd |
| Unattributable | 120ms | 6ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-4Y3CX4YME3 | 83ms | 68ms | 15ms | 3rd |
A+Font Loading2 fonts (142 KB)PASS
Web fonts
2
142 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~64 KB and ~128 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall79 requests over 3518msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.igi-global.com www.igi-global.com | Other | 212ms | 1381 KB | 74% | $3/mo | Costly |
Unattributable Unattributable | Other | 120ms | 0 KB | — | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 83ms | 167 KB | 39% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.igi-global.com adds 212ms 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.igi-global.com takes 212ms 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
74% of www.igi-global.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