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.
1.35 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.48 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.75 s
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.
3.92 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.
9.98 s
Page Load Progression
FPage Weight BudgetAction5.2 MB transferred, 164 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
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
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 CostAction7834ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.constantcontact.com/_next/static/chunks/2117-4ca1a743e6f7e736.js | 3452ms | 1857ms | 6ms | 3rd |
| https://www.constantcontact.com/_next/static/chunks/9703-725336a861474030.js | 1040ms | 550ms | 48ms | 3rd |
| https://www.constantcontact.com/_next/static/chunks/fd9d1056-5f297395f8861547.js | 919ms | 480ms | 21ms | 3rd |
| https://www.constantcontact.com/ | 688ms | 30ms | 34ms | 3rd |
| https://consent.cookiebot.com/uc.js | 632ms | 329ms | 6ms | 3rd |
| Unattributable | 405ms | 16ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-14T5LGLSQ3 | 126ms | 98ms | 26ms | 3rd |
| https://www.constantcontact.com/_next/static/chunks/4153-c2e55cd001fe0643.js | 117ms | 5ms | 110ms | 3rd |
| https://www.constantcontact.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 108ms | 103ms | 1ms | 3rd |
| https://code.tidio.co/widget-v4/1_427_0/static/js/widget.155aa5f3d5f6bde40f89.js | 85ms | 55ms | 25ms | 3rd |
Showing top 10 of 14 scripts
FJS BundlesAction69 scripts, 825 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.constantcontact.com/_next/static/chunks/9703-725336a861474030.js | 335 KB | 196 KB (59%) | ✓ | 3rd |
| https://www.constantcontact.com/_next/static/chunks/4153-c2e55cd001fe0643.js | 386 KB | 125 KB (32%) | ✓ | 3rd |
| https://code.tidio.co/widget-v4/1_427_0/static/js/widget.155aa5f3d5f6bde40f89.js | 214 KB | 124 KB (58%) | ✓ | 3rd |
| https://www.constantcontact.com/_next/static/chunks/dc112a36-7ca7a7d409b86d48.js | 79 KB | 68 KB (87%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-14T5LGLSQ3 | 173 KB | 66 KB (38%) | ✓ | 3rd |
| https://transcend-cdn.com/cm/ceb33a79-6942-496d-82eb-e6af9c7658ef/ui.js | 90 KB | 45 KB (50%) | ✓ | 3rd |
| https://www.constantcontact.com/_next/static/chunks/c473e9eb-3c280b268b890971.js | 127 KB | 36 KB (29%) | ✓ | 3rd |
| https://js.driftt.com/include/1776798600000/ugttdg9w9wam.js | 63 KB | 33 KB (52%) | ✓ | 3rd |
| https://consent.cookiebot.com/36973317-3a13-4d05-864e-97fcc940b9ee/cc.js?renew=false&referer=www.constantcontact.com&dnt=false&init=false&georegions=%5B%7B%22r%22%3A%22US%2CAU%2CCA%22%2C%22i%22%3A%220b732793-8382-4d70-9050-c95355d4f3a5%22%7D%5D | 159 KB | 30 KB (19%) | ✓ | 3rd |
| https://www.constantcontact.com/_next/static/chunks/2301-194e3fcd484b2704.js | 80 KB | 29 KB (39%) | ✓ | 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 InventoryAction164 resources · 5.2 MB · 825 KB savings availableFIX
~824.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 164 resources | 5.2 MiB | ||||||
CImage OptimizationAction40 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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingmax-age=0REVIEW
max-age=0
| Directive | Value | Meaning |
|---|---|---|
| max-age | 0 | Cache for 0 seconds |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (156 KB)PASS
Web fonts
4
156 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
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 ~1 KB and ~2 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall164 requests over 10717msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.constantcontact.com www.constantcontact.com | Other | 3452ms | 33 KB | — | $46/mo | Costly |
www.constantcontact.com www.constantcontact.com | Other | 1040ms | 335 KB | 59% | $14/mo | Costly |
www.constantcontact.com www.constantcontact.com | Other | 919ms | 55 KB | — | $12/mo | Costly |
www.constantcontact.com www.constantcontact.com | Other | 688ms | 70 KB | — | $9/mo | Costly |
consent.cookiebot.com consent.cookiebot.com | Other | 632ms | 36 KB | — | $8/mo | Costly |
Unattributable Unattributable | Other | 405ms | 0 KB | — | $5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 126ms | 173 KB | 38% | $2/mo | Optional |
www.constantcontact.com www.constantcontact.com | Other | 117ms | 386 KB | 32% | $2/mo | Optional |
www.constantcontact.com www.constantcontact.com | Other | 108ms | 0 KB | — | $1/mo | Optional |
code.tidio.co code.tidio.co | Other | 85ms | 214 KB | 58% | $1/mo | Optional |
transcend-cdn.com transcend-cdn.com | Other | 78ms | 90 KB | 50% | $1/mo | Optional |
tags.tiqcdn.com tags.tiqcdn.com | Other | 72ms | 2 KB | — | $1/mo | Optional |
tags.tiqcdn.com tags.tiqcdn.com | Other | 61ms | 18 KB | — | $1/mo | Optional |
Drift js.driftt.com | Chat | 50ms | 63 KB | 52% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.constantcontact.com adds 3452ms and costs ~$46/month
- www.constantcontact.com adds 1040ms and costs ~$14/month
- www.constantcontact.com adds 919ms and costs ~$12/month
- www.constantcontact.com adds 688ms and costs ~$9/month
- consent.cookiebot.com adds 632ms and costs ~$8/month
- Unattributable adds 405ms and costs ~$5/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
www.constantcontact.com takes 3452ms 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.constantcontact.com takes 1040ms 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
59% of www.constantcontact.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.constantcontact.com takes 919ms 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.constantcontact.com takes 688ms 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
consent.cookiebot.com takes 632ms 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 405ms 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
58% of code.tidio.co'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
50% of transcend-cdn.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
52% of Drift'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