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.
1.89 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.03 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
536 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.57 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.
4.78 s
Page Load Progression
FPage Weight BudgetAction3.2 MB transferred, 103 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
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
DJS Execution CostAction3246ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://cmp.osano.com/16CVqQSid6k3038vU/fef0f8b2-698d-45ee-89c5-d8fbf51fbfb7/osano.js | 541ms | 442ms | 16ms | 3rd |
| https://www.stltoday.com/ | 485ms | 30ms | 9ms | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 388ms | 321ms | 35ms | 3rd |
| Unattributable | 334ms | 12ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TDWDC2 | 184ms | 128ms | 33ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WXMV2VZ>m=4e64k0h2 | 168ms | 145ms | 22ms | 3rd |
| https://bloximages.newyork1.vip.townnews.com/stltoday.com/shared-content/art/tncms/templates/libraries/flex/components/plugins/resources/scripts/common.08a61544f369cc43bf02e71b2d10d49f.js | 152ms | 71ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-4T2EB147B8&cx=c>m=4e64k0h2 | 139ms | 120ms | 17ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PDQV3N | 127ms | 110ms | 15ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964 | 122ms | 84ms | 23ms | 3rd |
Showing top 10 of 17 scripts
FJS BundlesAction54 scripts, 1.3 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://a.pub.network/stltoday-com/prebid.js | 193 KB | 158 KB (82%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 148 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 0 KB | 148 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 148 KB (49%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964 | 188 KB | 142 KB (76%) | ✓ | 3rd |
| https://a.pub.network/stltoday-com/pubfig.engine.js | 152 KB | 122 KB (81%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TDWDC2 | 203 KB | 68 KB (33%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5MTD44X>m=4e64k0h2 | 120 KB | 67 KB (55%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-LCNYTE04MR&cx=c>m=4e64h1 | 171 KB | 65 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-4T2EB147B8&cx=c>m=4e64k0h2 | 153 KB | 64 KB (42%) | ✓ | 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 InventoryAction103 resources · 3.2 MB · 1.3 MB savings availableFIX
~1.3 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 103 resources | 3.2 MiB | ||||||
CImage OptimizationAction23 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
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 Loading2 fonts (60 KB)PASS
Web fonts
2
60 KB total
Render-blocking
0
of 2
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
AHTTP Cachingmax-age=300 (5 minutes)PASS
public, max-age=300
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 300 | Cache for 5 minutes |
Network Waterfall103 requests over 4912msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
cmp.osano.com cmp.osano.com | Other | 541ms | 78 KB | — | $9/mo | Costly |
www.stltoday.com www.stltoday.com | Other | 485ms | 68 KB | — | $8/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 388ms | 0 KB | 49% | $7/mo | Costly |
Unattributable Unattributable | Other | 334ms | 0 KB | — | $6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 184ms | 203 KB | 33% | $3/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 168ms | 135 KB | 39% | $3/mo | Optional |
bloximages.newyork1.vip.townnews.com bloximages.newyork1.vip.townnews.com | Other | 152ms | 14 KB | — | $3/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 139ms | 153 KB | 42% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 127ms | 122 KB | 50% | $2/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 122ms | 188 KB | 76% | $2/mo | Optional |
a.pub.network a.pub.network | Other | 112ms | 193 KB | 82% | $2/mo | Optional |
a.pub.network a.pub.network | Other | 100ms | 152 KB | 81% | $2/mo | Optional |
tagan.adlightning.com tagan.adlightning.com | Other | 99ms | 32 KB | 74% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 95ms | 171 KB | 38% | $2/mo | Optional |
bloximages.newyork1.vip.townnews.com bloximages.newyork1.vip.townnews.com | Other | 82ms | 38 KB | — | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 59ms | 120 KB | 55% | $1/mo | Optional |
tagan.adlightning.com tagan.adlightning.com | Other | 58ms | 85 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- cmp.osano.com adds 541ms and costs ~$9/month
- www.stltoday.com adds 485ms and costs ~$8/month
- www.gstatic.com adds 388ms and costs ~$7/month
- Unattributable adds 334ms and costs ~$6/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
cmp.osano.com takes 541ms 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.stltoday.com takes 485ms 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 388ms 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 334ms 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
50% 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
76% 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
82% of a.pub.network'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
81% of a.pub.network'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 tagan.adlightning.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
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