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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
70
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
68
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
67
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.18 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

2.18 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

115 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.021

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

6.64 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.

5.62 s

Page Load Progression

1.3 s
2.5 s
3.8 s
5.0 s
6.3 s
7.5 s
8.8 s
10.0 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 158 requests
FIX
3.4 MB transferred, 158 requests
Warning::
Page weighs 10.6 MB (3.4 MB transferred)
Warning::
JavaScript is 2.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.5 MB
Info::
Fonts are 224 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 224 KB
Info::
CSS is 216 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 216 KB
Warning::
158 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.72 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
158 requests
0.72 g CO2 per page load
JavaScript 2.5 MiB 73%
Images 300.1 KiB 9%
Fonts 224.4 KiB 6%
CSS 216.1 KiB 6%
HTML 135.8 KiB 4%
Other 42.1 KiB 1%
Other 17.0 KiB 0%
Other 566 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.4 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
64 scripts, 1001 KB unused
FIX
64 scripts, 1001 KB unused
Warning::
https://www.jci.org/assets/application-27f18b5fe3b...: 284 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 156 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 156 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 156 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 110 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1001 KB
1001 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.jci.org/assets/application-27f18b5fe3b7302e5b3e3c6d7cf9bb3f54759fad32679209f5aef429b89f3aef.js348 KB284 KB (82%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB156 KB (43%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB156 KB (43%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB156 KB (43%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31097945188 KB110 KB (58%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-2VCKF2JS2B&cx=c&_slc=1178 KB72 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WTNK8H9142 KB66 KB (47%)✓3rd
https://api.altmetric.com/v1/internal-556fdf0f/doi/10.1172/jci195411?callback=_altmetric.embed_callback&domain=www.jci.org&cache_until=23-220 KB—✓3rd
https://api.altmetric.com/v1/internal-556fdf0f/doi/10.1172/jci198835?callback=_altmetric.embed_callback&domain=www.jci.org&cache_until=23-220 KB—✓3rd
https://d1bxh8uas1mnw7.cloudfront.net/assets/embed.js1 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
Page Weight Inventory
Action
158 resources · 3.4 MB · 1001 KB savings available
FIX
158 resources · 3.4 MB · 1001 KB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~1001 KB of savings available
Warning::
157 third-party resources (100% of weight)
Info::
4 resources over 200KB
158 resources · 3.4 MiB · 157 third-party 2.4 MiB over 1MB target
JavaScript 73% · 2.5 MiB
Image 9% · 300.1 KiB
Font 6% · 224.4 KiB
CSS 6% · 216.1 KiB
Document 4% · 154.9 KiB
Other 1% · 40.0 KiB

~1000.8 KiB of savings available

Remove unused JavaScript: 1000.8 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
58 images, 0 KB saveable
REVIEW
58 images, 0 KB saveable
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/volumes/136/8... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.jci.org/assets/common/jci-spelled-out-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.jci.org/assets/social/rss-round-color-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.jci.org/assets/social/facebook-round-b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.jci.org/assets/social/twitter-round-bl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://dm5migu4zj3pb.cloudfront.net/manuscripts/2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
58 images 300 KB
0 oversized -0 KB
58 legacy format
35 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1835ms total JS execution
REVIEW
1835ms total JS execution
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 469ms CPU time
Warning::
https://www.jci.org/: 437ms CPU time
Warning::
Unattributable: 323ms CPU time
Info::
https://securepubads.g.doubleclick.net/pagead/mana...: 228ms CPU time
Info::
https://www.jci.org/assets/application-27f18b5fe3b...: 168ms CPU time
Warning::
Third-party scripts: 1835ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Other 17% Style & Layout 12% Script Parsing & Compilation 8% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js469ms422ms33ms3rd
https://www.jci.org/437ms2ms1ms3rd
Unattributable323ms19ms0ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js?cb=31097945228ms185ms34ms3rd
https://www.jci.org/assets/application-27f18b5fe3b7302e5b3e3c6d7cf9bb3f54759fad32679209f5aef429b89f3aef.js168ms79ms39ms3rd
https://www.googletagmanager.com/gtag/js?id=G-2VCKF2JS2B&cx=c&_slc=1120ms88ms31ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WTNK8H989ms74ms14ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
5 fonts (224 KB)
PASS
5 fonts (224 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

224 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 2.2 s LCP 2.2 shttps://dm5migu4zj3pb.cloudfront.net/fonts/klavika/woff/KlavikaWebBasicBold.woffKlavikaWebBasicBold.woff https://dm5migu4zj3pb.cloudfront.net/fonts/klavika/woff/KlavikaWebBasicBold.woff — 38.8 KiB — 371 ms — font-display: swaphttps://www.jci.org/assets/fontawesome-webfont-fa79d127baca4558a0b973f5f514b90fc5ef43314c41095f5cb285ffaa0a4029.woff2fontawesome-webfont-fa7... https://www.jci.org/assets/fontawesome-webfont-fa79d127baca4558a0b973f5f514b90fc5ef43314c41095f5cb285ffaa0a4029.woff2 — 75.6 KiB — 259 ms — font-display: swaphttps://dm5migu4zj3pb.cloudfront.net/fonts/klavika/woff/KlavikaWebBasicRegular.woffKlavikaWebBasicRegular.... https://dm5migu4zj3pb.cloudfront.net/fonts/klavika/woff/KlavikaWebBasicRegular.woff — 42.2 KiB — 439 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 96 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 11 ms — font-display: swap
KlavikaWebBasicBold.woff woff swap
Size 39 KB
Load time 371 ms
Start 8.8 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fontawesome-webfont-fa7... woff2 swap
Size 76 KB
Load time 259 ms
Start 8.8 s
Risk FOUT — text flashes from fallback to web font
KlavikaWebBasicRegular.... woff swap
Size 42 KB
Load time 439 ms
Start 8.9 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 96 ms
Start 9.3 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 11 ms
Start 9.9 s
Risk FOUT — text flashes from fallback to web font
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 ~24 KB and ~48 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
158 requests over 15807ms
INFO
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h3https://www.google-analytics.com/j/collect?v=1&_v=j102&a=456278968&t=pageview&_s=1&dl=https%3A%2F%2Fwww.jci.org%2F&ul=en-us&dt=JCI%20-%20Welcome&sr=800x600&vp=1350x940&_u=YEDAAEABAAAAACAAI~&jid=1661987229&gjid=1826654999&cid=1463545017.1776900666&tid=UA-382035-4&_gid=1189907752.1776900666&_r=1&_slc=1&gtm=45He64k1h1n81WTNK8H9za200&cd1=false&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938466~115938468~117266401&z=1373364558www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=456278968&t=pageview&_s=1&dl=https%3A%2F%2Fwww.jci.org%2F&ul=en-us&dt=JCI%20-%20Welcome&sr=800x600&vp=1350x940&_u=YEDAAEABAAAAACAAI~&jid=1661987229&gjid=1826654999&cid=1463545017.1776900666&tid=UA-382035-4&_gid=1189907752.1776900666&_r=1&_slc=1&gtm=45He64k1h1n81WTNK8H9za200&cd1=false&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938466~115938468~117266401&z=1373364558 — 200 — 86 B — 60 ms — h2https://ep1.adtrafficquality.google/getconfig/sodar?sv=200&tid=gpt&tv=m202604160201&st=env&sjk=2920903116690370ep1.adtrafficquality.google/getconf... https://ep1.adtrafficquality.google/getconfig/sodar?sv=200&tid=gpt&tv=m202604160201&st=env&sjk=2920903116690370 — 200 — 13.3 KiB — 153 ms — h3https://www.jci.org/favicon.icowww.jci.org/favicon.ico https://www.jci.org/favicon.ico — 301 — 421 B — 3.6 s — http/1.1https://securepubads.g.doubleclick.net/pagead/managed/dict/m202604210101/gptsecurepubads.g.doubleclick.net/page... https://securepubads.g.doubleclick.net/pagead/managed/dict/m202604210101/gpt — 200 — 23.0 KiB — 64 ms — h3https://www.googletagmanager.com/gtag/js?id=G-2VCKF2JS2B&cx=c&_slc=1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-2VCKF2JS2B&cx=c&_slc=1 — 200 — 177.6 KiB — 224 ms — h2https://ep2.adtrafficquality.google/sodar/sodar2.jsep2.adtrafficquality.google/sodar/s... https://ep2.adtrafficquality.google/sodar/sodar2.js — 200 — 7.9 KiB — 139 ms — h2https://www.youtube.com/generate_204?TbgrUQwww.youtube.com/generate_204?TbgrUQ https://www.youtube.com/generate_204?TbgrUQ — 204 — 10 B — 14 ms — h3https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 126 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 312 B — 68 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-2VCKF2JS2B&gtm=45je64m0h2v9139027874za20g&_p=1776900665059&gcd=13l3l3l3l2l1&npa=0&dma=0&_eu=AhAI&are=1&cid=1463545017.1776900666&frm=0&pscdl=noapi&rcb=15&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266400~117512543~118463261&dl=https%3A%2F%2Fwww.jci.org%2F&dt=JCI%20-%20Welcome&sid=1776900666&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&gap.uat=0~115938466~115938468~117266401&ep.ua_dimension_1=false&tfd=10684www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-2VCKF2JS2B&gtm=45je64m0h2v9139027874za20g&_p=1776900665059&gcd=13l3l3l3l2l1&npa=0&dma=0&_eu=AhAI&are=1&cid=1463545017.1776900666&frm=0&pscdl=noapi&rcb=15&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266400~117512543~118463261&dl=https%3A%2F%2Fwww.jci.org%2F&dt=JCI%20-%20Welcome&sid=1776900666&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&gap.uat=0~115938466~115938468~117266401&ep.ua_dimension_1=false&tfd=10684 — 204 — 20 B — 166 ms — h3https://www.google-analytics.com/g/collect?v=2&tid=G-2VCKF2JS2B&gtm=45je64m0h2v9139027874za20g&_p=1776900665059&gcd=13l3l3l3l2l1&npa=0&dma=0&_eu=ABgIAAQ&are=1&cid=1463545017.1776900666&frm=0&pscdl=noapi&rcb=15&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=2&tag_exp=0~115616986~115938466~115938468~117266400~117512543~118463261&dl=https%3A%2F%2Fwww.jci.org%2F&dt=JCI%20-%20Welcome&cu=USD&sid=1776900666&sct=1&seg=0&_tu=wAQ&en=additional_page_after_home&_c=1&gap.uat=0~115938466~115938468~117266401&ep.ua_dimension_1=false&epn.value=0&_et=6&tfd=10691www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-2VCKF2JS2B&gtm=45je64m0h2v9139027874za20g&_p=1776900665059&gcd=13l3l3l3l2l1&npa=0&dma=0&_eu=ABgIAAQ&are=1&cid=1463545017.1776900666&frm=0&pscdl=noapi&rcb=15&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=2&tag_exp=0~115616986~115938466~115938468~117266400~117512543~118463261&dl=https%3A%2F%2Fwww.jci.org%2F&dt=JCI%20-%20Welcome&cu=USD&sid=1776900666&sct=1&seg=0&_tu=wAQ&en=additional_page_after_home&_c=1&gap.uat=0~115938466~115938468~117266401&ep.ua_dimension_1=false&epn.value=0&_et=6&tfd=10691 — 204 — 20 B — 160 ms — h3https://ep2.adtrafficquality.google/sodar/sodar2/254/runner.htmlep2.adtrafficquality.google/sodar/s... https://ep2.adtrafficquality.google/sodar/sodar2/254/runner.html — 200 — 5.8 KiB — 65 ms — h2https://www.google.com/recaptcha/api2/aframewww.google.com/recaptcha/api2/afram... https://www.google.com/recaptcha/api2/aframe — 200 — 568 B — 110 ms — h3https://pagead2.googlesyndication.com/bg/gHgVpHNo6dn0XHhe-kL49krin5JQn9VQtx09w0rxLvA.jspagead2.googlesyndication.com/bg/gH... https://pagead2.googlesyndication.com/bg/gHgVpHNo6dn0XHhe-kL49krin5JQn9VQtx09w0rxLvA.js — 200 — 21.7 KiB — 79 ms — h3https://pagead2.googlesyndication.com/pagead/sodar?id=sodar2&v=254&li=gpt_m202604160201&jk=2920903116690370&rc=nullpagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/sodar?id=sodar2&v=254&li=gpt_m202604160201&jk=2920903116690370&rc=null — 204 — 17 B — 93 ms — h3https://www.google.com/recaptcha/enterprise/reload?k=6LdqSIwsAAAAAMaqy5uLiYS-EPIhRnFwvbhTZS9ywww.google.com/recaptcha/enterprise... https://www.google.com/recaptcha/enterprise/reload?k=6LdqSIwsAAAAAMaqy5uLiYS-EPIhRnFwvbhTZS9y — 200 — 2.1 KiB — 136 ms — h3https://ep2.adtrafficquality.google/generate_204?6wEywAep2.adtrafficquality.google/generat... https://ep2.adtrafficquality.google/generate_204?6wEywA — 204 — 40 B — 5 ms — h2https://www.google.com/recaptcha/enterprise/clr?k=6LdqSIwsAAAAAMaqy5uLiYS-EPIhRnFwvbhTZS9ywww.google.com/recaptcha/enterprise... https://www.google.com/recaptcha/enterprise/clr?k=6LdqSIwsAAAAAMaqy5uLiYS-EPIhRnFwvbhTZS9y — 200 — 16 B — 115 ms — h3https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=gpt_m202604160201&jk=2920903116690370&bg=!IiGlIUPNAAa1ilLUlYo7AEcBe5WfOHcSDpPMVCQ3oCvEAcy9ju5-Mtb4E72uz7dZYf6I18zczkRnnaJ-uOwX4tDqGhTudNqBQnROW0WXdzS_6iSPX4fFywIAAABgUgAAAAdoAQd-ADfjGogSSc6i9d8uCCSGrCHm_Kbd2SFQzvlOjoKvNd01_YoxTCTtnNp99xVG2KXfOeaNUA0bqM3PmQKYvYD7I_DZlzBBeIE84ieQ4aX9IX4BXZ8Z6tywjOyeqgKR_1yhTVcq8jamP4Te7iAkXf-tf7cUQ-YhCSmi9QpRXwWUD4ISKxiuEXVDtDhSnRyvR2vEKkil1zZSim4sxFOmW74ZSBQ0n8UWaPzHc9-z6OPsxP9W5Iu98wOaAKkbH-iuYGtJv-TfLNsya-kP6xFJt80DWiHbFqmcEzGKDgTbH1GFO5YmArr-dPlbxZe8m6r5PnEQ8snHjE9vhwWfrkLVRVyKnsBaxmf_eg9miR37U-RqooJ9e87jnwsCCCbZ05Pi2ouAGy1J4_AVbifKjLQTZTPcvFE2w8z9x0hkvAHCAcTo0i2socBuRtZxHOjW4PVhieAFp_YsXoBubpS08j99vkC08zVr3dYoLoYXPrsyeXch2YglD3FobweEMoJQoJb7DQsSHDPCg8vsGAhCQAgF1AyxYDaELp1A5ib1vPS9byxbO8xzQDtReq5Xm7x9QPkoNfUHZuLuwcy1mEyeaY72QgRz_9PAMkhjtK6NyT65DktQ9fzyppPqfMsqDtQ0cggpyBNwS6q0uttavxRUnDi7alaAVQj-tvi4FoKtyo2Cr3J9sCZSWyrC6OlQ8pZY4GLvc8pY_tWvvQeXdTNKHjrmsEj0J0YMePWPwSjnqpLo8l3qlZjogzcoGdY-_gZWWna35XoqhEmnkK91HMUfYs7r9vNyLK0Vl5MroRlFx1T_ceUTExlygMAHI2kmKJt3FTGC3UZ7XpHKFH1BD6qwbOTdNRD5aXCnvH4bTG2bNkVuIwa-rZdkKq0drI-X5Ej1FUQLW-RrW5e_1VIdjUmdfCmibs6GBn3akADTRsnyDKH1XXgikJi9mdKPkSjsP9PTMiiycOF7Pt-a1gep1.adtrafficquality.google/pagead/... 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— 204 — 17 B — 112 ms — h3https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 66 ms — h3https://www.jci.org/404www.jci.org/404 https://www.jci.org/404 — 404 — 18.4 KiB — 1.9 s — http/1.1https://s7.addthis.com/js/300/addthis_widget.jss7.addthis.com/js/300/addthis_widge... https://s7.addthis.com/js/300/addthis_widget.js — -1 — 0 B — 70 ms — https://d1bxh8uas1mnw7.cloudfront.net/assets/embed.jsd1bxh8uas1mnw7.cloudfront.net/asset... https://d1bxh8uas1mnw7.cloudfront.net/assets/embed.js — 304 — 305 B — 4 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1835ms · 898KB · $24/mo
www.gstatic.com
Other
Costly
Execution 469ms
Transfer 0 KB
Unused 43%
Monthly Cost $6/mo
www.jci.org
Other
Costly
Execution 437ms
Transfer 42 KB
Monthly Cost $6/mo
Unattributable
Other
Costly
Execution 323ms
Transfer 0 KB
Monthly Cost $4/mo
securepubads.g.doubleclick.net
Other
Costly
Execution 228ms
Transfer 188 KB
Unused 58%
Monthly Cost $3/mo
www.jci.org
Other
Optional
Execution 168ms
Transfer 348 KB
Unused 82%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 120ms
Transfer 178 KB
Unused 41%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 89ms
Transfer 142 KB
Unused 47%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 469ms and costs ~$6/month
  • www.jci.org adds 437ms and costs ~$6/month
  • Unattributable adds 323ms and costs ~$4/month
  • securepubads.g.doubleclick.net adds 228ms and costs ~$3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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.gstatic.com takes 469ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.jci.org takes 437ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 323ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

securepubads.g.doubleclick.net takes 228ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

58% of securepubads.g.doubleclick.net's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

82% of www.jci.org's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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