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.
11.21 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
66.54 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
612 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.152
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
13.03 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.
67.26 s
Page Load Progression
541 ms 1.1 s
1.6 s
2.2 s 2.7 s
3.2 s
3.8 s
4.3 sFPage Weight BudgetAction13.8 MB transferred, 179 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 CostAction4416ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 1113ms | 354ms | 0ms | 3rd |
| https://www.nyse.com/index | 1103ms | 13ms | 19ms | 3rd |
| https://static.nyse.com/cms/41.8.11/chunks/node_modules/react-router/dist/index-js-commonjs-proxy-DUrQT1kj.js | 734ms | 583ms | 2ms | 3rd |
| https://players.brightcove.net/5805274531001/experience_681e3468457e26566674b841/live.js | 548ms | 293ms | 189ms | 3rd |
| https://players.brightcove.net/5805274531001/default_default/index.min.js | 548ms | 365ms | 121ms | 3rd |
| https://static.nyse.com/cms/41.8.11/chunks/node_modules/@theice/website-components/build/hooks/useElementQuery-3UdWHkTL.js | 163ms | 1ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-N6K229P | 140ms | 106ms | 28ms | 3rd |
| https://static.nyse.com/cms/41.8.11/assets/nyse.css | 65ms | 0ms | 0ms | 3rd |
FJS BundlesAction127 scripts, 696 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://players.brightcove.net/5805274531001/default_default/index.min.js | 0 KB | 142 KB (64%) | ✓ | 3rd |
| https://players.brightcove.net/5805274531001/default_default/index.min.js | 221 KB | 142 KB (64%) | ✓ | 3rd |
| https://static.nyse.com/cms/41.8.11/chunks/cms-components/icon/DynamicIcon-BI004pcx.js | 119 KB | 109 KB (93%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-N6K229P | 126 KB | 69 KB (55%) | ✓ | 3rd |
| https://static.nyse.com/cms/41.8.11/chunks/cms-components/bighead/Main-CxAFwwPC.js | 70 KB | 62 KB (90%) | ✓ | 3rd |
| https://static.nyse.com/cms/41.8.11/chunks/node_modules/react-router/dist/index-js-commonjs-proxy-DUrQT1kj.js | 111 KB | 57 KB (51%) | ✓ | 3rd |
| https://static.nyse.com/cms/41.8.11/hydrate.js | 111 KB | 47 KB (43%) | ✓ | 3rd |
| https://static.nyse.com/cms/41.8.11/chunks/node_modules/slate-history/dist/index-es-CFlCdNay.js | 61 KB | 45 KB (76%) | ✓ | 3rd |
| https://static.nyse.com/cms/41.8.11/chunks/node_modules/date-fns/addYears/index-js-commonjs-es-import-RsRtjehL.js | 47 KB | 24 KB (53%) | ✓ | 3rd |
| https://static.nyse.com/cms/41.8.11/chunks/node_modules/@theice/website-components/build/components/lists/ListItem-fryzIlTa.js | 1 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 InventoryAction179 resources · 13.8 MB · 696 KB savings availableFIX
~695.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 179 resources | 13.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction21 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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading14 fonts (201 KB)PASS
Web fonts
14
201 KB total
Render-blocking
0
of 14
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
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 ~15 KB and ~30 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
Network Waterfall179 requests over 2024msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 1113ms | 0 KB | — | $15/mo | Costly |
www.nyse.com www.nyse.com | Other | 1103ms | 56 KB | — | $15/mo | Costly |
static.nyse.com static.nyse.com | Other | 734ms | 111 KB | 51% | $10/mo | Costly |
players.brightcove.net players.brightcove.net | Other | 548ms | 232 KB | — | $7/mo | Costly |
players.brightcove.net players.brightcove.net | Other | 548ms | 0 KB | 64% | $7/mo | Costly |
static.nyse.com static.nyse.com | Other | 163ms | 2 KB | — | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 140ms | 126 KB | 55% | $2/mo | Optional |
static.nyse.com static.nyse.com | Other | 65ms | 127 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 1113ms and costs ~$15/month
- www.nyse.com adds 1103ms and costs ~$15/month
- static.nyse.com adds 734ms and costs ~$10/month
- players.brightcove.net adds 548ms and costs ~$7/month
- players.brightcove.net adds 548ms and costs ~$7/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 1113ms 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.nyse.com takes 1103ms 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.nyse.com takes 734ms 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 static.nyse.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
players.brightcove.net takes 548ms 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
players.brightcove.net takes 548ms 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 players.brightcove.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
55% 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