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.
827 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.88 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
677 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.408
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.92 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.
4.54 s
Page Load Progression
1.0 s
2.1 s
3.1 s
4.1 s
5.2 s 6.2 s
7.2 s
8.3 sFPage Weight BudgetAction7.4 MB transferred, 269 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
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 CostAction3873ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://assets.twitch.tv/assets/56004-66d68a0eb8ef5ca75bfc.js | 1732ms | 1510ms | 17ms | 3rd |
| https://passport.twitch.tv/149e9513-01fa-4fb0-aad4-566afd725d1b/2d206a39-8ed7-437e-a3be-862e0f06eea3/ips.js?ga__15_abel=03joKnKfRDCOZdlxa9sRQOGVdFuRX6fL5V5EGz1mnlQ9JI1MJqgS1aK0GoyM81NuhmEnUjAxYdIjPRze8VzvIlLNy74f7WnqoIhxg51JkJiLWxiJRXRnJ5G315OyYraKSbw9LyFv1p2B8tx1qmXLUXtPrpL2hvRTip61HFOug8Yne3ehTz&x-kpsdk-v=j-1.2.308&x-kpsdk-im=AAKkTVzxiBMhox2LiilbUJhl3TZYKCdM9hTFy-xtxt976uKZ-MZSUuAvpefhBWnTRaKKzTg_H-PWLMWwJMZS7_Pz1-8 | 535ms | 493ms | 9ms | 3rd |
| https://www.twitch.tv/ | 450ms | 19ms | 9ms | 3rd |
| https://gql.twitch.tv/149e9513-01fa-4fb0-aad4-566afd725d1b/2d206a39-8ed7-437e-a3be-862e0f06eea3/ips.js?KP_UIDZ_1=04a3QeZAMqTz00U5zjDu93dDXXdM9xv6AzADti5D6fbQLaNMThqOPsTS7akiC2ZwbvedMxqQbAQ9Z9kuByiXwrE68Xoo4rTevixUJ1zlJi8G528zPYxm1JqXICBwvn3FYMLs5EaY8kAFwvt8Tk4eQgf1pJgchMrUsPeqYFGX5f5wwgVRbg&x-kpsdk-v=j-1.2.308&x-kpsdk-im=AAJDb-c0O9SIUB8uZQQg0Sqav1_rYnF212X9o4Xb_UZVarnVUQk33ZNrvXsyE8vY8gq_JVqZZ2gsl0UNZy6YkXKhZPw | 395ms | 368ms | 8ms | 3rd |
| Unattributable | 293ms | 26ms | 0ms | 3rd |
| https://assets.twitch.tv/assets/core-76fd248f0e269b36a6ba.js | 232ms | 216ms | 14ms | 3rd |
| https://k.twitchcdn.net/149e9513-01fa-4fb0-aad4-566afd725d1b/2d206a39-8ed7-437e-a3be-862e0f06eea3/p.js | 125ms | 110ms | 3ms | 3rd |
| https://assets.twitch.tv/assets/player-core-variant-b-976fc71ba01c6c79a34d.js | 110ms | 81ms | 7ms | 3rd |
DJS BundlesAction143 scripts, 488 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://assets.twitch.tv/assets/core-76fd248f0e269b36a6ba.js | 0 KB | 84 KB (51%) | ✓ | 3rd |
| https://assets.twitch.tv/assets/core-76fd248f0e269b36a6ba.js | 164 KB | 84 KB (51%) | ✓ | 3rd |
| https://assets.twitch.tv/assets/56004-66d68a0eb8ef5ca75bfc.js | 241 KB | 73 KB (30%) | ✓ | 3rd |
| https://assets.twitch.tv/assets/59046-445b669d1871788706c0.js | 138 KB | 62 KB (45%) | ✓ | 3rd |
| https://assets.twitch.tv/assets/player-core-variant-b-976fc71ba01c6c79a34d.js | 88 KB | 56 KB (63%) | ✓ | 3rd |
| https://assets.twitch.tv/assets/flags-ff62b41fa1a6ed5b8694.js | 60 KB | 39 KB (65%) | ✓ | 3rd |
| https://assets.twitch.tv/assets/25470-7c62c863a0ab0cccb559.js | 30 KB | 24 KB (78%) | ✓ | 3rd |
| https://assets.twitch.tv/assets/features.whispers-cba8aa881b4cd4625037.js | 27 KB | 23 KB (88%) | ✓ | 3rd |
| https://assets.twitch.tv/assets/72001-074b1cab8ba14fbcbf6d.js | 94 KB | 23 KB (25%) | ✓ | 3rd |
| https://assets.twitch.tv/assets/88480-bd7265781dc8ec200b3e.js | 24 KB | 21 KB (88%) | ✓ | 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 InventoryAction269 resources · 7.4 MB · 488 KB savings availableFIX
~487.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 269 resources | 7.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction39 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
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+Font Loading4 fonts (120 KB)PASS
Web fonts
4
120 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
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)
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall269 requests over 8236msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
assets.twitch.tv assets.twitch.tv | Other | 1732ms | 241 KB | 30% | $23/mo | Costly |
passport.twitch.tv passport.twitch.tv | Other | 535ms | 261 KB | — | $7/mo | Costly |
www.twitch.tv www.twitch.tv | Other | 450ms | 67 KB | — | $6/mo | Costly |
gql.twitch.tv gql.twitch.tv | Other | 395ms | 239 KB | — | $5/mo | Costly |
Unattributable Unattributable | Other | 293ms | 0 KB | — | $4/mo | Costly |
assets.twitch.tv assets.twitch.tv | Other | 232ms | 0 KB | 51% | $3/mo | Costly |
k.twitchcdn.net k.twitchcdn.net | Other | 125ms | 58 KB | — | $2/mo | Optional |
assets.twitch.tv assets.twitch.tv | Other | 110ms | 88 KB | 63% | $1/mo | Optional |
These scripts may cost more than they're worth
- assets.twitch.tv adds 1732ms and costs ~$23/month
- passport.twitch.tv adds 535ms and costs ~$7/month
- www.twitch.tv adds 450ms and costs ~$6/month
- gql.twitch.tv adds 395ms and costs ~$5/month
- Unattributable adds 293ms and costs ~$4/month
- assets.twitch.tv adds 232ms 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
assets.twitch.tv takes 1732ms 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
passport.twitch.tv takes 535ms 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.twitch.tv takes 450ms 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
gql.twitch.tv takes 395ms 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 293ms 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
assets.twitch.tv takes 232ms 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
51% of assets.twitch.tv'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
63% of assets.twitch.tv'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