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.
3.92 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
6.07 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.65 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.426
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.06 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.
7.97 s
Page Load Progression
1.0 s 2.0 s 3.0 s
4.1 s
5.1 s 6.1 s
7.1 s
8.1 sFPage Weight BudgetAction12.2 MB transferred, 140 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
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
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 ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction5763ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://d3ukkjpihy42k4.cloudfront.net/js/base-web-components.a35bc3b1f159f30009f7.js | 2473ms | 1406ms | 30ms | 3rd |
| https://navbar.blizzard.com/static/v1/nav.js | 840ms | 532ms | 11ms | 3rd |
| https://www.blizzard.com/en-us/ | 767ms | 460ms | 1ms | 3rd |
| Unattributable | 514ms | 13ms | 0ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js | 283ms | 236ms | 24ms | 3rd |
| https://navbar.blizzard.com/static/v1/footer.js | 272ms | 200ms | 11ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TVHPB9J | 194ms | 164ms | 24ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-10163466&cx=c>m=4e64h1 | 185ms | 155ms | 29ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-VYKNV7C0S3&cx=c>m=4e64h1 | 125ms | 98ms | 18ms | 3rd |
| https://d3ukkjpihy42k4.cloudfront.net/js/rum.2a2176dd5f6b08e491b3.js | 59ms | 49ms | 3ms | 3rd |
Showing top 10 of 11 scripts
FJS BundlesAction14 scripts, 520 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://d3ukkjpihy42k4.cloudfront.net/js/base-web-components.a35bc3b1f159f30009f7.js | 860 KB | 236 KB (28%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TVHPB9J | 175 KB | 69 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-VYKNV7C0S3&cx=c>m=4e64h1 | 169 KB | 66 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-10163466&cx=c>m=4e64h1 | 130 KB | 61 KB (47%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js | 105 KB | 58 KB (55%) | ✓ | 3rd |
| https://d3ukkjpihy42k4.cloudfront.net/js/rum.2a2176dd5f6b08e491b3.js | 87 KB | 31 KB (36%) | ✓ | 3rd |
| https://d3ukkjpihy42k4.cloudfront.net/js/products.3b5076df5f346475ee9f.js | 1 KB | — | ✓ | 3rd |
| https://navbar.blizzard.com/static/v1/nav.js | 75 KB | — | ✓ | 3rd |
| https://navbar.blizzard.com/static/v1/footer.js | 77 KB | — | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/otSDKStub.js | 9 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 InventoryAction140 resources · 12.2 MB · 520 KB savings availableFIX
~520.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 140 resources | 12.2 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization75 images, 0 KB saveableREVIEW
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 Loading2 fonts (315 KB)PASS
Web fonts
2
315 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- 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 ~217 KB and ~434 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall140 requests over 9708msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
d3ukkjpihy42k4.cloudfront.net d3ukkjpihy42k4.cloudfront.net | Other | 2473ms | 860 KB | 28% | $33/mo | Costly |
navbar.blizzard.com navbar.blizzard.com | Other | 840ms | 75 KB | — | $11/mo | Costly |
www.blizzard.com www.blizzard.com | Other | 767ms | 12 KB | — | $10/mo | Costly |
Unattributable Unattributable | Other | 514ms | 0 KB | — | $7/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 283ms | 105 KB | 55% | $4/mo | Essential |
navbar.blizzard.com navbar.blizzard.com | Other | 272ms | 77 KB | — | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 194ms | 175 KB | 39% | $3/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 185ms | 130 KB | 47% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 125ms | 169 KB | 39% | $2/mo | Optional |
d3ukkjpihy42k4.cloudfront.net d3ukkjpihy42k4.cloudfront.net | Other | 59ms | 87 KB | 36% | $1/mo | Optional |
Bing UET bat.bing.com | Advertising | 51ms | 15 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- d3ukkjpihy42k4.cloudfront.net adds 2473ms and costs ~$33/month
- navbar.blizzard.com adds 840ms and costs ~$11/month
- www.blizzard.com adds 767ms and costs ~$10/month
- Unattributable adds 514ms and costs ~$7/month
- navbar.blizzard.com adds 272ms 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
d3ukkjpihy42k4.cloudfront.net takes 2473ms 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
navbar.blizzard.com takes 840ms 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.blizzard.com takes 767ms 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
Unattributable takes 514ms 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
55% of OneTrust'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
navbar.blizzard.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