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.
10.69 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
17.47 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
6.76 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.027
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
16.02 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.
31.38 s
Page Load Progression
913 ms 1.8 s 2.7 s
3.6 s
4.6 s
5.5 s
6.4 s
7.3 sFPage Weight BudgetAction9.0 MB transferred, 134 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 CostAction17603ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://d3ukkjpihy42k4.cloudfront.net/js/base-web-components.a35bc3b1f159f30009f7.js | 8788ms | 5082ms | 117ms | 3rd |
| https://navbar.blizzard.com/static/v1/nav.js | 2163ms | 1027ms | 46ms | 3rd |
| https://www.blizzard.com/en-us/ | 2140ms | 1547ms | 6ms | 3rd |
| Unattributable | 1154ms | 54ms | 0ms | 3rd |
| https://navbar.blizzard.com/static/v1/footer.js | 1150ms | 554ms | 44ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TVHPB9J | 754ms | 560ms | 109ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js | 503ms | 340ms | 61ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-VYKNV7C0S3&cx=c>m=4e64h1 | 288ms | 203ms | 65ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-10163466&cx=c>m=4e64h1 | 281ms | 230ms | 48ms | 3rd |
| https://d3ukkjpihy42k4.cloudfront.net/js/rum.2a2176dd5f6b08e491b3.js | 263ms | 172ms | 12ms | 3rd |
Showing top 10 of 11 scripts
FJS BundlesAction14 scripts, 528 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 | 241 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 | 33 KB (38%) | ✓ | 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 InventoryAction134 resources · 9.0 MB · 528 KB savings availableFIX
~527.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 134 resources | 9.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization70 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
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall134 requests over 8461msINFO
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 | 8788ms | 860 KB | 28% | $117/mo | Costly |
navbar.blizzard.com navbar.blizzard.com | Other | 2163ms | 75 KB | — | $29/mo | Costly |
www.blizzard.com www.blizzard.com | Other | 2140ms | 12 KB | — | $28/mo | Costly |
Unattributable Unattributable | Other | 1154ms | 0 KB | — | $15/mo | Costly |
navbar.blizzard.com navbar.blizzard.com | Other | 1150ms | 77 KB | — | $15/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 754ms | 175 KB | 39% | $10/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 503ms | 105 KB | 55% | $7/mo | Essential |
Google Tag Manager www.googletagmanager.com | Tag Manager | 288ms | 169 KB | 39% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 281ms | 130 KB | 47% | $4/mo | Costly |
d3ukkjpihy42k4.cloudfront.net d3ukkjpihy42k4.cloudfront.net | Other | 263ms | 87 KB | 38% | $3/mo | Costly |
Bing UET bat.bing.com | Advertising | 120ms | 15 KB | — | $2/mo | Optional |
These scripts may cost more than they're worth
- d3ukkjpihy42k4.cloudfront.net adds 8788ms and costs ~$117/month
- navbar.blizzard.com adds 2163ms and costs ~$29/month
- www.blizzard.com adds 2140ms and costs ~$28/month
- Unattributable adds 1154ms and costs ~$15/month
- navbar.blizzard.com adds 1150ms and costs ~$15/month
- Google Tag Manager adds 754ms and costs ~$10/month
- Google Tag Manager adds 288ms and costs ~$4/month
- Google Tag Manager adds 281ms and costs ~$4/month
- d3ukkjpihy42k4.cloudfront.net adds 263ms 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
d3ukkjpihy42k4.cloudfront.net takes 8788ms 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 2163ms 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 2140ms 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 1154ms 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 1150ms 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
Google Tag Manager takes 754ms 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
Google Tag Manager takes 288ms 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
Google Tag Manager takes 281ms 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
d3ukkjpihy42k4.cloudfront.net takes 263ms 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