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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
5
INFO
2

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

39
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

1.40 s

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

5.10 s

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

424 ms

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

0.244

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

1.92 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.

6.11 s

Page Load Progression

405 ms
810 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.2 s
Checks
15
5 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 160 requests
FIX
3.7 MB transferred, 160 requests
Warning::
Page weighs 10.7 MB (3.7 MB transferred)
Warning::
JavaScript is 2.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.6 MB
Info::
Fonts are 398 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 398 KB
Warning::
160 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.78 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
160 requests
0.78 g CO2 per page load
JavaScript 2.6 MiB 71%
Images 424.8 KiB 11%
Fonts 398.5 KiB 11%
Other 115.1 KiB 3%
HTML 70.7 KiB 2%
CSS 63.6 KiB 2%
Other 9.5 KiB 0%
Other 7.6 KiB 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

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
81% third-party, 0 ms blocking
FIX
81% third-party, 0 ms blocking
Warning::
Third-party code accounts for 81% of page weight (3.0 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
19%
81%
First-party Third-party
D
JS Execution Cost
Action
2158ms total JS execution
FIX
2158ms total JS execution
Warning::
https://jmir.org/: 423ms CPU time
Warning::
https://jmir.org/_nuxt/cceee7c.js: 345ms CPU time
Warning::
https://8b5f0effe65c.us-east-2.sdk.awswaf.com/8b5f...: 334ms CPU time
Info::
Unattributable: 183ms CPU time
Info::
https://js.hs-analytics.net/analytics/177688770000...: 182ms CPU time
Warning::
Third-party scripts: 1390ms (64% of total)

Main Thread Breakdown

Script Evaluation 60% Style & Layout 14% Other 10% Script Parsing & Compilation 9% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://jmir.org/423ms9ms10ms1st
https://jmir.org/_nuxt/cceee7c.js345ms282ms1ms1st
https://8b5f0effe65c.us-east-2.sdk.awswaf.com/8b5f0effe65c/72fd6064c3cc/challenge.js334ms274ms33ms3rd
Unattributable183ms14ms0ms3rd
https://js.hs-analytics.net/analytics/1776887700000/19668141.js182ms130ms3ms3rd
https://cdn.jsdelivr.net/npm/@iabtechlabtcf/core@1.5.20/+esm165ms148ms0ms3rd
https://static.zdassets.com/web_widget/classic/latest/web-widget-main-22a6ed7.js165ms133ms20ms3rd
https://www.googletagmanager.com/gtag/js?id=G-MEVSCZYLY0&cx=c&gtm=4e64k090ms77ms12ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-58BHBF4V85ms71ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-YP0XNYBWWC&cx=c&gtm=4e64k070ms56ms13ms3rd

Showing top 10 of 12 scripts

F
JS Bundles
Action
91 scripts, 678 KB unused
FIX
91 scripts, 678 KB unused
Warning::
https://static.zdassets.com/web_widget/classic/lat...: 111 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-107...: 106 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-186...: 91 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-YP0X...: 69 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-MEVS...: 68 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 678 KB
678 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.zdassets.com/web_widget/classic/latest/web-widget-main-22a6ed7.js261 KB111 KB (43%)3rd
https://www.googletagmanager.com/gtag/js?id=AW-1071448537&cx=c&gtm=4e64k0145 KB106 KB (73%)3rd
https://www.googletagmanager.com/gtag/js?id=UA-186918-1&cx=c&gtm=4e64k0125 KB91 KB (73%)3rd
https://www.googletagmanager.com/gtag/js?id=G-YP0XNYBWWC&cx=c&gtm=4e64k0171 KB69 KB (40%)3rd
https://www.googletagmanager.com/gtag/js?id=G-MEVSCZYLY0&cx=c&gtm=4e64k0175 KB68 KB (39%)3rd
https://www.googletagmanager.com/gtag/js?id=AW-1071448537145 KB64 KB (44%)3rd
https://www.googletagmanager.com/gtag/js?id=UA-186918-1&l=dataLayer125 KB61 KB (49%)3rd
https://www.googletagmanager.com/gtm.js?id=GTM-58BHBF4V156 KB60 KB (39%)3rd
https://jmir.org/_nuxt/5b4af9a.js38 KB24 KB (64%)1st
https://badge.dimensions.ai/badge.js81 KB24 KB (29%)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
160 resources · 3.7 MB · 678 KB savings available
FIX
160 resources · 3.7 MB · 678 KB savings available
Warning::
Page weight 2.7 MB over 1MB target
Got: 3.7 MB Expected: ≤ 1 MB
Info::
~678 KB of savings available
Warning::
108 third-party resources (81% of weight)
Info::
3 resources over 200KB
160 resources · 3.7 MiB · 108 third-party 2.7 MiB over 1MB target
JavaScript 71% · 2.6 MiB
Image 11% · 430.7 KiB
Font 11% · 398.5 KiB
Other 3% · 125.8 KiB
Document 2% · 71.1 KiB
CSS 2% · 63.6 KiB

~678.0 KiB of savings available

Remove unused JavaScript: 678.0 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.
Info::
ETag present — enables conditional (304) responses

No Cache-Control header

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

C
Image Optimization
Action
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
Warning::
https://asset.jmir.pub/resources/images/partners/o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://asset.jmir.pub/resources/images/logos/JMIR... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://asset.jmir.pub/resources/images/partners/c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://asset.jmir.pub/resources/images/partners/o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://asset.jmir.pub/resources/images/partners/t... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://19668141.fs1.hubspotusercontent-na1.net/hu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://asset.jmir.pub/resources/images/partners/c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://asset.jmir.pub/placeholder.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://asset.jmir.pub/resources/images/partners/O... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
29 images 425 KB
0 oversized -0 KB
22 legacy format
9 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

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
6 fonts (398 KB)
PASS
6 fonts (398 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

398 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.4 s LCP 5.1 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 38 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.2/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.2/webfonts/fa-solid-900.woff2 — 153.5 KiB — 136 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.2/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.2/webfonts/fa-brands-400.woff2 — 115.8 KiB — 37 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnkaSTbQWg.woff2KFO5CnqEu92Fr1Mu53ZEC9_... https://fonts.gstatic.com/s/roboto/v51/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnkaSTbQWg.woff2 — 40.8 KiB — 35 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBHMdazTgWw.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBHMdazTgWw.woff2 — 16.3 KiB — 25 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMawCUBHMdazTgWw.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMawCUBHMdazTgWw.woff2 — 35.5 KiB — 29 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 38 ms
Start 573 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 153 KB
Load time 136 ms
Start 573 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 37 ms
Start 693 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
KFO5CnqEu92Fr1Mu53ZEC9_... woff2 swap
Size 41 KB
Load time 35 ms
Start 693 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 16 KB
Load time 25 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 35 KB
Load time 29 ms
Start 2.6 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 ~135 KB and ~270 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
160 requests over 3991ms
INFO
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https://region1.google-analytics.com/g/collect?v=2&tid=G-MEVSCZYLY0&gtm=45je64k0v9134331181za20gzd9222866275&_p=1776887974731&gcs=G100&gcd=13q3qPW2q5l1&npa=1&dma_cps=-&dma=1&tcfd=16y5b&gdid=dNTg2Nz.dZTQ1Zm&ecid=1736465373&_eu=AAAIAGA&are=1&cid=979238054.1776887977&ec_mode=a&frm=0&pscdl=denied&rcb=6&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115938465~115938469~117266400~117512542~118463261&dt=index&dp=%2F&dl=https%3A%2F%2Fjmir.org%2F&sid=1776887977&sct=1&seg=0&_tu=CA&en=page_view&_fv=1&_ss=1&_ee=1&tfd=2878 — 204 — 48 B — 28 ms — h2https://embed.altmetric.com/assets/embed-c7211c533cfd49b09124ad5a57d5450345b51dfbc3fc4f72afb532975b94cc25.cssembed.altmetric.com/assets/embed-c7... https://embed.altmetric.com/assets/embed-c7211c533cfd49b09124ad5a57d5450345b51dfbc3fc4f72afb532975b94cc25.css — 200 — 2.1 KiB — 32 ms — h2https://d1uo4w7k31k5mn.cloudfront.net/v2_hq/1.pngd1uo4w7k31k5mn.cloudfront.net/v2_hq... https://d1uo4w7k31k5mn.cloudfront.net/v2_hq/1.png — 200 — 2.2 KiB — 59 ms — h2https://d1uo4w7k31k5mn.cloudfront.net/v2_hq/22.pngd1uo4w7k31k5mn.cloudfront.net/v2_hq... https://d1uo4w7k31k5mn.cloudfront.net/v2_hq/22.png — 200 — 2.2 KiB — 60 ms — h2https://d1uo4w7k31k5mn.cloudfront.net/v2_hq/17.pngd1uo4w7k31k5mn.cloudfront.net/v2_hq... https://d1uo4w7k31k5mn.cloudfront.net/v2_hq/17.png — 200 — 2.2 KiB — 42 ms — h2https://track.hubspot.com/__ptq.gif?k=1&sd=800x600&cd=24-bit&cs=UTF-8&ln=en-us&bfp=77aa843077f368b0529fc4daefe7a8c4&v=1.1&a=19668141&pu=https%3A%2F%2Fjmir.org%2F&t=Journal+of+Medical+Internet+Research&cts=1776887977198&vi=da34e3dec356fe858140c144a03481d4&nc=true&cc=15track.hubspot.com/__ptq.gif?k=1&sd=... https://track.hubspot.com/__ptq.gif?k=1&sd=800x600&cd=24-bit&cs=UTF-8&ln=en-us&bfp=77aa843077f368b0529fc4daefe7a8c4&v=1.1&a=19668141&pu=https%3A%2F%2Fjmir.org%2F&t=Journal+of+Medical+Internet+Research&cts=1776887977198&vi=da34e3dec356fe858140c144a03481d4&nc=true&cc=15 — 200 — 1.1 KiB — 180 ms — h2https://asset.jmir.pub/assets/static/images/favicon-32x32.pngasset.jmir.pub/assets/static/images... https://asset.jmir.pub/assets/static/images/favicon-32x32.png — 200 — 3.6 KiB — 20 ms — h2https://8b5f0effe65c.9270f73c.us-east-2.token.awswaf.com/8b5f0effe65c/72fd6064c3cc/telemetry8b5f0effe65c.9270f73c.us-east-2.tok... https://8b5f0effe65c.9270f73c.us-east-2.token.awswaf.com/8b5f0effe65c/72fd6064c3cc/telemetry — 200 — 1.2 KiB — 310 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
64% of JavaScript execution is third-party
First-party Third-party 1390ms · 1092KB · €15/mo
8b5f0effe65c.us-east-2.sdk.awswaf.com
Other
Costly
Execution 334ms
Transfer 0 KB
Monthly Cost €4/mo
Unattributable
Other
Optional
Execution 183ms
Transfer 0 KB
Monthly Cost €2/mo
HubSpot Analytics
Analytics
Optional
Execution 182ms
Transfer 43 KB
Monthly Cost €2/mo
jsDelivr
CDN
Optional
Execution 165ms
Transfer 10 KB
Monthly Cost €2/mo
Zendesk Widget
Customer Support
Optional
Execution 165ms
Transfer 261 KB
Unused 43%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 90ms
Transfer 175 KB
Unused 39%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 85ms
Transfer 156 KB
Unused 39%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 70ms
Transfer 171 KB
Unused 40%
Monthly Cost €1/mo
app.enzuzo.com
Other
Optional
Execution 68ms
Transfer 131 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 50ms
Transfer 145 KB
Unused 44%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • 8b5f0effe65c.us-east-2.sdk.awswaf.com adds 334ms and costs ~€4/month

64% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

8b5f0effe65c.us-east-2.sdk.awswaf.com takes 334ms 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

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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