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.
2.39 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
17.28 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
12.45 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.052
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
17.39 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.
46.47 s
Page Load Progression
FPage Weight BudgetAction29.6 MB transferred, 323 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 CostAction40230ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 7263ms | 275ms | 0ms | 3rd |
| https://www.ted.com/_next/static/chunks/10ve7kro4jeja.js | 5183ms | 3323ms | 30ms | 3rd |
| https://www.ted.com/ | 4699ms | 77ms | 11ms | 3rd |
| https://www.ted.com/_next/static/chunks/13mh4qsg0ojc3.js | 4567ms | 300ms | 13ms | 3rd |
| https://www.ted.com/_next/static/chunks/0.jna.w-3mqdg.js | 2350ms | 1685ms | 1ms | 3rd |
| https://cmp.osano.com/AzqTgHUHUGJa7gInt/9e4d9097-fa02-474b-9ac9-958cf3f54337/osano.js | 1710ms | 1548ms | 38ms | 3rd |
| https://www.ted.com/_next/static/chunks/0bokogfw9jzpb.js | 1279ms | 862ms | 3ms | 3rd |
| https://www.ted.com/_next/static/chunks/turbopack-0li4q.l8idl5g.js | 1145ms | 1136ms | 2ms | 3rd |
| https://media.begenuin.com/sdk/chunks/index-8EYXbSqT.js | 1062ms | 807ms | 8ms | 3rd |
| https://www.ted.com/_next/static/chunks/0-1uuud_vkogc.js | 950ms | 192ms | 25ms | 3rd |
Showing top 10 of 47 scripts
FJS BundlesAction127 scripts, 1.7 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://static.fundraiseup.com/checkout.2fb913ca26161876.js | 403 KB | 359 KB (89%) | ✓ | 3rd |
| https://media.begenuin.com/sdk/chunks/feed-C4rzC3fy.js | 196 KB | 172 KB (88%) | ✗ | 3rd |
| https://media.begenuin.com/sdk/chunks/index-8EYXbSqT.js | 287 KB | 160 KB (56%) | ✗ | 3rd |
| https://cdn.yourbow.com/ted/hbyb.js | 196 KB | 144 KB (73%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604130101/pubads_impl.js | 188 KB | 131 KB (70%) | ✓ | 3rd |
| https://media.begenuin.com/sdk/chunks/vendor-forms-BRAWdd6O.js | 161 KB | 120 KB (75%) | ✗ | 3rd |
| https://static.fundraiseup.com/checkout-sentry-vendor.dda4c7629502a974.js | 112 KB | 112 KB (100%) | ✓ | 3rd |
| https://media.begenuin.com/sdk/chunks/vendor-animation-Cov7gVAf.js | 131 KB | 99 KB (76%) | ✗ | 3rd |
| https://static.fundraiseup.com/checkout-vendors.78ab7844d94042df.js | 105 KB | 87 KB (83%) | ✓ | 3rd |
| https://www.ted.com/_next/static/chunks/0ohty3wb33a.t.js | 84 KB | 62 KB (74%) | ✓ | 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 InventoryAction323 resources · 29.6 MB · 1.7 MB savings availableFIX
~1.7 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 323 resources | 29.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization43 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 Loading3 fonts (435 KB)PASS
Web fonts
3
435 KB total
Render-blocking
0
of 3
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
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 ~178 KB and ~356 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints19 hints, 0 missing preconnectsPASS
Current Resource Hints
19 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall323 requests over 10811msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 7263ms | 0 KB | — | €79/mo | Costly |
www.ted.com www.ted.com | Other | 5183ms | 60 KB | — | €56/mo | Costly |
www.ted.com www.ted.com | Other | 4699ms | 58 KB | — | €51/mo | Costly |
www.ted.com www.ted.com | Other | 4567ms | 23 KB | — | €50/mo | Costly |
www.ted.com www.ted.com | Other | 2350ms | 0 KB | — | €26/mo | Costly |
cmp.osano.com cmp.osano.com | Other | 1710ms | 55 KB | — | €19/mo | Costly |
www.ted.com www.ted.com | Other | 1279ms | 6 KB | — | €14/mo | Costly |
www.ted.com www.ted.com | Other | 1145ms | 4 KB | — | €12/mo | Costly |
media.begenuin.com media.begenuin.com | Other | 1062ms | 287 KB | 56% | €12/mo | Costly |
www.ted.com www.ted.com | Other | 950ms | 43 KB | 51% | €10/mo | Costly |
www.ted.com www.ted.com | Other | 941ms | 12 KB | — | €10/mo | Costly |
www.ted.com www.ted.com | Other | 814ms | 4 KB | — | €9/mo | Costly |
media.begenuin.com media.begenuin.com | Other | 789ms | 76 KB | 36% | €9/mo | Costly |
cdn.yourbow.com cdn.yourbow.com | Other | 775ms | 196 KB | 73% | €8/mo | Costly |
cdn.fundraiseup.com cdn.fundraiseup.com | Other | 535ms | 65 KB | 34% | €6/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 526ms | 188 KB | 70% | €6/mo | Costly |
www.ted.com www.ted.com | Other | 521ms | 2 KB | — | €6/mo | Costly |
static.fundraiseup.com static.fundraiseup.com | Other | 492ms | 105 KB | 83% | €5/mo | Costly |
static.cdn.prismic.io static.cdn.prismic.io | Other | 482ms | 10 KB | — | €5/mo | Costly |
www.ted.com www.ted.com | Other | 477ms | 3 KB | — | €5/mo | Costly |
b-code.liadm.com b-code.liadm.com | Other | 359ms | 47 KB | — | €4/mo | Costly |
static.fundraiseup.com static.fundraiseup.com | Other | 292ms | 403 KB | 89% | €3/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 285ms | 34 KB | — | €3/mo | Costly |
www.ted.com www.ted.com | Other | 262ms | 15 KB | — | €3/mo | Costly |
www.ted.com www.ted.com | Other | 237ms | 71 KB | 64% | €3/mo | Costly |
ak.sail-horizon.com ak.sail-horizon.com | Other | 174ms | 48 KB | — | €2/mo | Optional |
www.ted.com www.ted.com | Other | 171ms | 23 KB | — | €2/mo | Optional |
www.ted.com www.ted.com | Other | 164ms | 51 KB | — | €2/mo | Optional |
static.fundraiseup.com static.fundraiseup.com | Other | 148ms | 37 KB | — | €2/mo | Optional |
cmp.osano.com cmp.osano.com | Other | 147ms | 29 KB | — | €2/mo | Optional |
www.ted.com www.ted.com | Other | 145ms | 11 KB | — | €2/mo | Optional |
www.ted.com www.ted.com | Other | 120ms | 2 KB | — | €1/mo | Optional |
www.ted.com www.ted.com | Other | 118ms | 0 KB | — | €1/mo | Optional |
www.ted.com www.ted.com | Other | 110ms | 0 KB | — | €1/mo | Optional |
www.ted.com www.ted.com | Other | 110ms | 84 KB | 74% | €1/mo | Optional |
www.ted.com www.ted.com | Other | 105ms | 0 KB | — | €1/mo | Optional |
www.ted.com www.ted.com | Other | 87ms | 29 KB | — | €1/mo | Optional |
media.begenuin.com media.begenuin.com | Other | 87ms | 196 KB | 88% | €1/mo | Optional |
www.ted.com www.ted.com | Other | 76ms | 2 KB | — | €1/mo | Optional |
www.ted.com www.ted.com | Other | 65ms | 10 KB | — | €1/mo | Optional |
www.ted.com www.ted.com | Other | 62ms | 12 KB | — | €1/mo | Optional |
www.ted.com www.ted.com | Other | 60ms | 0 KB | — | €1/mo | Optional |
www.ted.com www.ted.com | Other | 60ms | 46 KB | — | €1/mo | Optional |
static.fundraiseup.com static.fundraiseup.com | Other | 58ms | 112 KB | 100% | €1/mo | Optional |
www.ted.com www.ted.com | Other | 56ms | 52 KB | — | €1/mo | Optional |
www.ted.com www.ted.com | Other | 55ms | 35 KB | — | €1/mo | Optional |
www.ted.com www.ted.com | Other | 55ms | 1 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 7263ms and costs ~€79/month
- www.ted.com adds 5183ms and costs ~€56/month
- www.ted.com adds 4699ms and costs ~€51/month
- www.ted.com adds 4567ms and costs ~€50/month
- www.ted.com adds 2350ms and costs ~€26/month
- cmp.osano.com adds 1710ms and costs ~€19/month
- www.ted.com adds 1279ms and costs ~€14/month
- www.ted.com adds 1145ms and costs ~€12/month
- media.begenuin.com adds 1062ms and costs ~€12/month
- www.ted.com adds 950ms and costs ~€10/month
- www.ted.com adds 941ms and costs ~€10/month
- www.ted.com adds 814ms and costs ~€9/month
- media.begenuin.com adds 789ms and costs ~€9/month
- cdn.yourbow.com adds 775ms and costs ~€8/month
- cdn.fundraiseup.com adds 535ms and costs ~€6/month
- securepubads.g.doubleclick.net adds 526ms and costs ~€6/month
- www.ted.com adds 521ms and costs ~€6/month
- static.fundraiseup.com adds 492ms and costs ~€5/month
- static.cdn.prismic.io adds 482ms and costs ~€5/month
- www.ted.com adds 477ms and costs ~€5/month
- b-code.liadm.com adds 359ms and costs ~€4/month
- static.fundraiseup.com adds 292ms and costs ~€3/month
- securepubads.g.doubleclick.net adds 285ms and costs ~€3/month
- www.ted.com adds 262ms and costs ~€3/month
- www.ted.com adds 237ms 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
Unattributable takes 7263ms 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.ted.com takes 5183ms 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.ted.com takes 4699ms 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.ted.com takes 4567ms 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.ted.com takes 2350ms 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
cmp.osano.com takes 1710ms 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.ted.com takes 1279ms 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.ted.com takes 1145ms 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
media.begenuin.com takes 1062ms 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
56% of media.begenuin.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
www.ted.com takes 950ms 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 www.ted.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
www.ted.com takes 941ms 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.ted.com takes 814ms 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
media.begenuin.com takes 789ms 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.yourbow.com takes 775ms 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
73% of cdn.yourbow.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
cdn.fundraiseup.com 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
securepubads.g.doubleclick.net takes 526ms 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
70% of securepubads.g.doubleclick.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
www.ted.com takes 521ms 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.fundraiseup.com takes 492ms 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
83% of static.fundraiseup.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.cdn.prismic.io takes 482ms 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.ted.com takes 477ms 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
b-code.liadm.com takes 359ms 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.fundraiseup.com takes 292ms 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
89% of static.fundraiseup.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
securepubads.g.doubleclick.net takes 285ms 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.ted.com takes 262ms 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.ted.com takes 237ms 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
64% of www.ted.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
74% of www.ted.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
88% of media.begenuin.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
100% of static.fundraiseup.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