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.
2.45 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.33 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
615 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.243
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.64 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.
5.31 s
Page Load Progression
FPage Weight BudgetAction3.1 MB transferred, 67 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
DJS Execution CostAction2961ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://assets.nflxext.com/web/ffe/wp/ui/landingPages/nmhp/nmhpFrameworkClient.fcc229dc9c54f05b4357.js | 1044ms | 754ms | 197ms | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 853ms | 620ms | 173ms | 3rd |
| https://www.netflix.com/nl-en/ | 643ms | 11ms | 26ms | 3rd |
| Unattributable | 279ms | 52ms | 0ms | 3rd |
| https://help.nflxext.com/helpcenter/OneTrust/oneTrust_production_2026-03-26/scripttemplates/202602.1.0/otBannerSdk.js | 142ms | 95ms | 22ms | 3rd |
FJS BundlesAction11 scripts, 1.2 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://assets.nflxext.com/web/ffe/wp/ui/landingPages/nmhp/nmhpFrameworkClient.fcc229dc9c54f05b4357.js | 708 KB | 226 KB (32%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 0 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 0 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 0 KB | 177 KB (49%) | ✓ | 3rd |
| https://help.nflxext.com/helpcenter/OneTrust/oneTrust_production_2026-03-26/scripttemplates/202602.1.0/otBannerSdk.js | 129 KB | 69 KB (53%) | ✓ | 3rd |
| https://help.nflxext.com/helpcenter/OneTrust/oneTrust_production_2026-03-26/scripttemplates/otSDKStub.js | 9 KB | — | ✓ | 3rd |
| https://www.google.com/recaptcha/enterprise.js?render=6LdqW_EqAAAAAO87Fb_kcZfNzs0IqJRcKiJDYpUv | 1 KB | — | ✓ | 3rd |
| https://www.google.com/recaptcha/enterprise/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4 | 0 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 InventoryAction67 resources · 3.1 MB · 1.2 MB savings availableFIX
~1.2 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 67 resources | 3.1 MiB | ||||||
BImage Optimization15 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 Loading7 fonts (689 KB)PASS
Web fonts
7
689 KB total
Render-blocking
0
of 7
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
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 ~220 KB and ~440 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
AHTTP Cachingmax-age=3600 (1 hour)PASS
public, must-revalidate, proxy-revalidate, max-age=3600
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| must-revalidate | — | Must recheck with server after expiry |
| proxy-revalidate | — | |
| max-age | 3600 | Cache for 1 hour |
Network Waterfall67 requests over 4503msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
assets.nflxext.com assets.nflxext.com | Other | 1044ms | 708 KB | 32% | €11/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 853ms | 0 KB | 49% | €9/mo | Costly |
www.netflix.com www.netflix.com | Other | 643ms | 76 KB | — | €7/mo | Costly |
Unattributable Unattributable | Other | 279ms | 0 KB | — | €3/mo | Costly |
help.nflxext.com help.nflxext.com | Other | 142ms | 129 KB | 53% | €2/mo | Optional |
These scripts may cost more than they're worth
- assets.nflxext.com adds 1044ms and costs ~€11/month
- www.gstatic.com adds 853ms and costs ~€9/month
- www.netflix.com adds 643ms and costs ~€7/month
- Unattributable adds 279ms 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.nflxext.com takes 1044ms 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.gstatic.com takes 853ms 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.netflix.com takes 643ms 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 279ms 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
53% of help.nflxext.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