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.
3.15 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
15.97 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.14 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.024
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.32 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.
17.30 s
Page Load Progression
FPage Weight BudgetAction2.7 MB transferred, 89 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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction3590ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.crunchyroll.com/ | 618ms | 42ms | 3ms | 3rd |
| https://static.crunchyroll.com/cr-acquisition/index-e5bca7e4.f7f7ee5609c5e95f26fa.js | 547ms | 433ms | 17ms | 3rd |
| Unattributable | 473ms | 99ms | 0ms | 3rd |
| https://static.crunchyroll.com/cr-acquisition/error.11d2b2d1eb06ec3414e5.js | 464ms | 437ms | 1ms | 3rd |
| https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js | 419ms | 273ms | 145ms | 3rd |
| https://static.crunchyroll.com/cr-acquisition/index-9a8b795a.3ee0b69b049182bd3e30.js | 275ms | 250ms | 2ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202601.1.0/otBannerSdk.js | 263ms | 146ms | 42ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PK7T4JG | 246ms | 193ms | 48ms | 3rd |
| https://www.crunchyroll.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 183ms | 175ms | 2ms | 3rd |
| https://static.crunchyroll.com/cr-acquisition/index-efdee510.5aeacf7afa026088f300.js | 52ms | 37ms | 1ms | 3rd |
Showing top 10 of 11 scripts
FJS BundlesAction38 scripts, 315 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js | 259 KB | 164 KB (63%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PK7T4JG | 164 KB | 85 KB (52%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202601.1.0/otBannerSdk.js | 127 KB | 66 KB (52%) | ✓ | 3rd |
| https://static.crunchyroll.com/cr-acquisition/index-19f9d112.141ba52bf0cf289251b2.js | 14 KB | — | ✗ | 3rd |
| https://static.crunchyroll.com/cr-acquisition/index-1d1fa024.90beed1b7f6f9bee5931.js | 10 KB | — | ✓ | 3rd |
| https://static.crunchyroll.com/cr-acquisition/index-9a8b795a.3ee0b69b049182bd3e30.js | 9 KB | — | ✓ | 3rd |
| https://static.crunchyroll.com/cr-acquisition/index-cd271a2f.f5ac859306b0f48c4d78.js | 6 KB | — | ✓ | 3rd |
| https://static.crunchyroll.com/cr-acquisition/index-7f854005.793e3f1381f8a5edd232.js | 35 KB | — | ✓ | 3rd |
| https://static.crunchyroll.com/cr-acquisition/index-536eaa00.b6b3f80fb50dcb7c9b8b.js | 12 KB | — | ✓ | 3rd |
| https://static.crunchyroll.com/analytics/cr-eec-8.10.1.js | 11 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
DPage Weight InventoryAction89 resources · 2.7 MB · 315 KB savings availableFIX
~315.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 89 resources | 2.7 MiB | ||||||
BImage Optimization13 images, 0 KB saveableREVIEW
A+Text CompressionAll text resources are compressedPASS
A+Font Loading6 fonts (630 KB)PASS
Web fonts
6
630 KB total
Render-blocking
0
of 6
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
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- 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 ~270 KB and ~540 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
AHTTP Cachingmax-age=3600 (1 hour)PASS
max-age=3600
| Directive | Value | Meaning |
|---|---|---|
| max-age | 3600 | Cache for 1 hour |
Network Waterfall89 requests over 2938msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.crunchyroll.com www.crunchyroll.com | Other | 618ms | 3 KB | — | $8/mo | Costly |
static.crunchyroll.com static.crunchyroll.com | Other | 547ms | 57 KB | — | $7/mo | Costly |
Unattributable Unattributable | Other | 473ms | 0 KB | — | $6/mo | Costly |
static.crunchyroll.com static.crunchyroll.com | Other | 464ms | 5 KB | — | $6/mo | Costly |
cdn.ketchjs.com cdn.ketchjs.com | Other | 419ms | 259 KB | 63% | $6/mo | Costly |
static.crunchyroll.com static.crunchyroll.com | Other | 275ms | 9 KB | — | $4/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 263ms | 127 KB | 52% | $3/mo | Essential |
Google Tag Manager www.googletagmanager.com | Tag Manager | 246ms | 164 KB | 52% | $3/mo | Costly |
www.crunchyroll.com www.crunchyroll.com | Other | 183ms | 0 KB | — | $2/mo | Optional |
static.crunchyroll.com static.crunchyroll.com | Other | 52ms | 8 KB | — | $1/mo | Optional |
static.crunchyroll.com static.crunchyroll.com | Other | 50ms | 35 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.crunchyroll.com adds 618ms and costs ~$8/month
- static.crunchyroll.com adds 547ms and costs ~$7/month
- Unattributable adds 473ms and costs ~$6/month
- static.crunchyroll.com adds 464ms and costs ~$6/month
- cdn.ketchjs.com adds 419ms and costs ~$6/month
- static.crunchyroll.com adds 275ms and costs ~$4/month
- Google Tag Manager adds 246ms 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.crunchyroll.com takes 618ms 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
static.crunchyroll.com takes 547ms 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 473ms 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
static.crunchyroll.com takes 464ms 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.ketchjs.com takes 419ms 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
63% of cdn.ketchjs.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
static.crunchyroll.com takes 275ms 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
52% 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 246ms 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
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