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.
9.71 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
27.79 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.48 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.242
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
9.99 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.
27.98 s
Page Load Progression
528 ms
1.1 s
1.6 s 2.1 s 2.6 s 3.2 s 3.7 s
4.2 sFPage Weight BudgetAction4.4 MB transferred, 177 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
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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
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 CostAction5722ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 1192ms | 79ms | 0ms | 3rd |
| https://www.epi.org/ | 1093ms | 95ms | 15ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TMRN68M | 513ms | 456ms | 51ms | 3rd |
| https://www.epi.org/stas/ | 461ms | 314ms | 88ms | 3rd |
| https://www.epi.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 | 401ms | 277ms | 12ms | 3rd |
| https://www.epi.org/cdn-cgi/challenge-platform/scripts/jsd/main.js | 304ms | 291ms | 4ms | 3rd |
| https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js | 221ms | 182ms | 33ms | 3rd |
| https://form-assets.mailchimp.com/snippet/account/8216701?site=33fa77dfa783aab4139e286a9 | 215ms | 119ms | 67ms | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 185ms | 133ms | 51ms | 3rd |
| https://connect.facebook.net/signals/config/322603365198568?v=2.9.303&r=stable&domain=www.epi.org&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168 | 175ms | 144ms | 29ms | 3rd |
Showing top 10 of 19 scripts
DJS BundlesAction72 scripts, 392 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://s3.amazonaws.com/downloads.mailchimp.com/js/mc-validate.js | 140 KB | 90 KB (65%) | ✓ | 3rd |
| https://form-assets.mailchimp.com/snippet/account/8216701?site=33fa77dfa783aab4139e286a9 | 109 KB | 73 KB (67%) | ✓ | 3rd |
| https://www.epi.org/stas/ | 186 KB | 58 KB (31%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/bundle/sdk.js/ | 78 KB | 54 KB (69%) | ✓ | 3rd |
| https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js | 57 KB | 38 KB (67%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 33 KB (35%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TMRN68M | 131 KB | 25 KB (48%) | ✓ | 3rd |
| https://static.addtoany.com/menu/modules/core.ydpp7jcu.js | 26 KB | 21 KB (82%) | ✓ | 3rd |
| https://www.epi.org/wp-content/mu-plugins/epi-base-functions/royalSlider/jquery.royalslider.min.js?ver=0309-090931 | 17 KB | — | ✓ | 3rd |
| https://www.epi.org/wp-content/themes/epi/js/requirejs/epi_main.js?ver=0309-091018 | 2 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
DPage Weight InventoryAction177 resources · 4.4 MB · 392 KB savings availableFIX
~392.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 177 resources | 4.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction32 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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading35 fonts (938 KB)PASS
Web fonts
35
938 KB total
Render-blocking
0
of 35
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~98 KB and ~196 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 Waterfall177 requests over 6259msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 1192ms | 0 KB | — | $16/mo | Costly |
www.epi.org www.epi.org | Other | 1093ms | 36 KB | — | $15/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 513ms | 131 KB | 48% | $7/mo | Costly |
www.epi.org www.epi.org | Other | 461ms | 186 KB | 31% | $6/mo | Costly |
www.epi.org www.epi.org | Other | 401ms | 30 KB | — | $5/mo | Costly |
www.epi.org www.epi.org | Other | 304ms | 0 KB | — | $4/mo | Costly |
Hotjar script.hotjar.com | Session Replay | 221ms | 57 KB | 67% | $3/mo | Costly |
form-assets.mailchimp.com form-assets.mailchimp.com | Other | 215ms | 109 KB | 67% | $3/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 185ms | 97 KB | 35% | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 175ms | 46 KB | — | $2/mo | Optional |
Twitter/X Embed platform.twitter.com | Social | 171ms | 27 KB | — | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 146ms | 78 KB | 69% | $2/mo | Optional |
form-assets.mailchimp.com form-assets.mailchimp.com | Other | 136ms | 3 KB | — | $2/mo | Optional |
s3.amazonaws.com s3.amazonaws.com | Other | 120ms | 140 KB | 65% | $2/mo | Optional |
www.epi.org www.epi.org | Other | 109ms | 705 KB | — | $1/mo | Optional |
static.cloudflareinsights.com static.cloudflareinsights.com | Other | 79ms | 11 KB | — | $1/mo | Optional |
Google Analytics www.google-analytics.com | Analytics | 70ms | 21 KB | — | $1/mo | Optional |
www.epi.org www.epi.org | Other | 65ms | 21 KB | — | $1/mo | Optional |
www.epi.org www.epi.org | Other | 65ms | 6 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 1192ms and costs ~$16/month
- www.epi.org adds 1093ms and costs ~$15/month
- Google Tag Manager adds 513ms and costs ~$7/month
- www.epi.org adds 461ms and costs ~$6/month
- www.epi.org adds 401ms and costs ~$5/month
- www.epi.org adds 304ms and costs ~$4/month
- Hotjar adds 221ms and costs ~$3/month
- form-assets.mailchimp.com adds 215ms 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 1192ms 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.epi.org takes 1093ms 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
Google Tag Manager takes 513ms 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.epi.org takes 461ms 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.epi.org takes 401ms 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.epi.org takes 304ms 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
Hotjar takes 221ms 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
67% of Hotjar'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
form-assets.mailchimp.com takes 215ms 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
67% of form-assets.mailchimp.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
69% of Facebook Pixel'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
65% of s3.amazonaws.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