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.
5.47 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
14.93 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
734 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.89 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.
14.96 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2241ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 371ms | 73ms | 0ms | 3rd |
| https://cdn.matterhorn.app/matterhorn-fitt/e763da369e89-release-2026-04-07-v1.1.0.2149/client/matterhorn-fitt/home-65fc0f60.js | 359ms | 352ms | 0ms | 3rd |
| https://www.go.com/ | 294ms | 10ms | 33ms | 3rd |
| https://cdn.matterhorn.app/matterhorn-fitt/e763da369e89-release-2026-04-07-v1.1.0.2149/client/matterhorn-fitt/369-23faa7bd.js | 279ms | 193ms | 63ms | 3rd |
| https://cdn.matterhorn.app/matterhorn-fitt/e763da369e89-release-2026-04-07-v1.1.0.2149/client/matterhorn-fitt/matterhorn-fitt-0657a546.js | 256ms | 250ms | 5ms | 3rd |
| https://dcf.espn.com/TWDC-DTCI/prod/Bootstrap.js | 199ms | 133ms | 60ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202211.2.0/otBannerSdk.js | 168ms | 124ms | 35ms | 3rd |
| https://dcf.espn.com/TWDC-DTCI/prod/code/9f52bb9e0a08485fc10c3a9be65fa2eb.js?conditionId0=4929445 | 143ms | 118ms | 23ms | 3rd |
| https://www.datadoghq-browser-agent.com/us1/v5/datadog-rum.js | 115ms | 87ms | 12ms | 3rd |
| https://cdn.matterhorn.app/matterhorn-fitt/e763da369e89-release-2026-04-07-v1.1.0.2149/client/matterhorn-fitt/646-b3060399.js | 57ms | 2ms | 55ms | 3rd |
DJS BundlesAction28 scripts, 496 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.matterhorn.app/matterhorn-fitt/e763da369e89-release-2026-04-07-v1.1.0.2149/client/matterhorn-fitt/646-b3060399.js | 192 KB | 113 KB (59%) | ✓ | 3rd |
| https://cdn.matterhorn.app/matterhorn-fitt/e763da369e89-release-2026-04-07-v1.1.0.2149/client/matterhorn-fitt/369-23faa7bd.js | 196 KB | 83 KB (42%) | ✓ | 3rd |
| https://dcf.espn.com/TWDC-DTCI/prod/Bootstrap.js | 115 KB | 55 KB (47%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202211.2.0/otBannerSdk.js | 92 KB | 52 KB (56%) | ✓ | 3rd |
| https://dcf.espn.com/TWDC-DTCI/prod/code/9f52bb9e0a08485fc10c3a9be65fa2eb.js?conditionId0=4929445 | 81 KB | 48 KB (60%) | ✓ | 3rd |
| https://dcf.espn.com/TWDC-DTCI/prod/code/169c4ad035035618bd35818bd25ecec4.js?conditionId0=4929443 | 54 KB | 41 KB (76%) | ✓ | 3rd |
| https://cdn.matterhorn.app/matterhorn-fitt/e763da369e89-release-2026-04-07-v1.1.0.2149/client/matterhorn-fitt/958-979c93d4.js | 70 KB | 34 KB (48%) | ✓ | 3rd |
| https://www.datadoghq-browser-agent.com/us1/v5/datadog-rum.js | 52 KB | 30 KB (57%) | ✓ | 3rd |
| https://cdn.matterhorn.app/matterhorn-fitt/e763da369e89-release-2026-04-07-v1.1.0.2149/client/matterhorn-fitt/matterhorn-fitt-0657a546.js | 0 KB | 21 KB (40%) | ✓ | 3rd |
| https://cdn.matterhorn.app/matterhorn-fitt/e763da369e89-release-2026-04-07-v1.1.0.2149/client/matterhorn-fitt/matterhorn-fitt-0657a546.js | 15 KB | 21 KB (40%) | ✓ | 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 InventoryAction56 resources · 1.7 MB · 496 KB savings availableFIX
~496.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 56 resources | 1.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.7 MB transferred, 56 requestsREVIEW
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
BImage Optimization10 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 Loading4 fonts (165 KB)PASS
Web fonts
4
165 KB total
Render-blocking
0
of 4
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
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 ~49 KB and ~98 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints7 hints, 0 missing preconnectsPASS
Current Resource Hints
7 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall56 requests over 2437msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 371ms | 0 KB | — | $5/mo | Costly |
cdn.matterhorn.app cdn.matterhorn.app | Other | 359ms | 0 KB | — | $5/mo | Costly |
www.go.com www.go.com | Other | 294ms | 49 KB | — | $4/mo | Costly |
cdn.matterhorn.app cdn.matterhorn.app | Other | 279ms | 196 KB | 42% | $4/mo | Costly |
cdn.matterhorn.app cdn.matterhorn.app | Other | 256ms | 0 KB | 40% | $3/mo | Costly |
dcf.espn.com dcf.espn.com | Other | 199ms | 115 KB | 47% | $3/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 168ms | 92 KB | 56% | $2/mo | Essential |
dcf.espn.com dcf.espn.com | Other | 143ms | 81 KB | 60% | $2/mo | Optional |
www.datadoghq-browser-agent.com www.datadoghq-browser-agent.com | Other | 115ms | 52 KB | 57% | $2/mo | Optional |
cdn.matterhorn.app cdn.matterhorn.app | Other | 57ms | 192 KB | 59% | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 371ms and costs ~$5/month
- cdn.matterhorn.app adds 359ms and costs ~$5/month
- www.go.com adds 294ms and costs ~$4/month
- cdn.matterhorn.app adds 279ms and costs ~$4/month
- cdn.matterhorn.app adds 256ms 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 371ms 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.matterhorn.app 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
www.go.com takes 294ms 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.matterhorn.app 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
cdn.matterhorn.app takes 256ms 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 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
60% of dcf.espn.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
57% of www.datadoghq-browser-agent.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
59% of cdn.matterhorn.app'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