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.
1.82 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.11 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
330 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.347
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.53 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.
8.09 s
Page Load Progression
375 ms 750 ms
1.1 s 1.5 s
1.9 s
2.2 s 2.6 s 3.0 sFPage Weight BudgetAction6.1 MB transferred, 114 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
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
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 BundlesAction35 scripts, 2.3 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://d1mgq2hv32qvw2.cloudfront.net/hbo/_next/static/chunks/55498c43-b02520269fd7ef6e.js | 1022 KB | 1021 KB (100%) | ✓ | 3rd |
| https://d1mgq2hv32qvw2.cloudfront.net/hbo/_next/static/chunks/23135-1b13803484047577.js | 602 KB | 600 KB (100%) | ✓ | 3rd |
| https://d1mgq2hv32qvw2.cloudfront.net/hbo/_next/static/chunks/064948e7-73ebf4635f6ae7c7.js | 162 KB | 161 KB (100%) | ✓ | 3rd |
| https://d1mgq2hv32qvw2.cloudfront.net/hbo/_next/static/chunks/46573-efa71c35906bfd05.js | 243 KB | 137 KB (57%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202508.2.0/otBannerSdk.js | 121 KB | 69 KB (57%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-9848493&cx=c>m=4e64h1 | 130 KB | 63 KB (48%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WT49NQW | 187 KB | 62 KB (33%) | ✓ | 3rd |
| https://d1mgq2hv32qvw2.cloudfront.net/hbo/_next/static/chunks/49983-6de7a14d0dc51070.js | 105 KB | 62 KB (59%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-KMTKKW3FN8&cx=c>m=4e64h1 | 144 KB | 62 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-6356875&cx=c>m=4e64h1 | 129 KB | 62 KB (48%) | ✓ | 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 InventoryAction114 resources · 6.1 MB · 2.3 MB savings availableFIX
~2.3 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 114 resources | 6.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction27 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
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
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
CJS Execution CostAction1600ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.hbo.com/ | 228ms | 7ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WT49NQW | 222ms | 186ms | 23ms | 3rd |
| Unattributable | 191ms | 28ms | 0ms | 3rd |
| https://d1mgq2hv32qvw2.cloudfront.net/hbo/_next/static/chunks/framework-1825a3f55cc78cd1.js | 176ms | 152ms | 10ms | 3rd |
| https://d1mgq2hv32qvw2.cloudfront.net/hbo/_next/static/chunks/55498c43-b02520269fd7ef6e.js | 149ms | 0ms | 148ms | 3rd |
| https://d1mgq2hv32qvw2.cloudfront.net/hbo/_next/static/chunks/pages/index-fb7e5fc2cda3563c.js | 122ms | 119ms | 3ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-KMTKKW3FN8&cx=c>m=4e64h1 | 103ms | 85ms | 15ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-874811131&cx=c>m=4e64h1 | 99ms | 78ms | 20ms | 3rd |
| https://d1mgq2hv32qvw2.cloudfront.net/hbo/_next/static/chunks/23135-1b13803484047577.js | 87ms | 1ms | 85ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-9848493&cx=c>m=4e64h1 | 86ms | 73ms | 12ms | 3rd |
Showing top 10 of 12 scripts
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 Loading3 fonts (111 KB)PASS
Web fonts
3
111 KB total
Render-blocking
0
of 3
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 Waterfall114 requests over 4519msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.hbo.com www.hbo.com | Other | 228ms | 19 KB | — | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 222ms | 187 KB | 33% | $3/mo | Costly |
Unattributable Unattributable | Other | 191ms | 0 KB | — | $3/mo | Optional |
d1mgq2hv32qvw2.cloudfront.net d1mgq2hv32qvw2.cloudfront.net | Other | 176ms | 66 KB | 46% | $2/mo | Optional |
d1mgq2hv32qvw2.cloudfront.net d1mgq2hv32qvw2.cloudfront.net | Other | 149ms | 1022 KB | 100% | $2/mo | Optional |
d1mgq2hv32qvw2.cloudfront.net d1mgq2hv32qvw2.cloudfront.net | Other | 122ms | 20 KB | — | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 103ms | 144 KB | 43% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 99ms | 138 KB | 43% | $1/mo | Optional |
d1mgq2hv32qvw2.cloudfront.net d1mgq2hv32qvw2.cloudfront.net | Other | 87ms | 602 KB | 100% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 86ms | 130 KB | 48% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 75ms | 129 KB | 48% | $1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 64ms | 121 KB | 57% | $1/mo | Essential |
These scripts may cost more than they're worth
- www.hbo.com adds 228ms and costs ~$3/month
- Google Tag Manager adds 222ms 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.hbo.com takes 228ms 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 222ms 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
100% of d1mgq2hv32qvw2.cloudfront.net'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
100% of d1mgq2hv32qvw2.cloudfront.net'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
57% 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