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https://diigo.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
2
REVIEW
2
PASS
11
INFO
2

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

Mobile Desktop
84
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
46
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

2.90 s

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

3.70 s

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

32 ms

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

0.000

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

2.90 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.

3.70 s

Page Load Progression

427 ms
853 ms
1.3 s
1.7 s
2.1 s
2.6 s
3.0 s
3.4 s
Checks
17
11 PASS 2 REVIEW 2 FIX
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 (388.8 KiB of 389.0 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Warning::
https://www.diigo.com/images/v6/homepage/organize.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.diigo.com/images/v6/homepage/banner.gi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.diigo.com/images/v6/homepage/collect.g... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.diigo.com/images/v6/homepage/annotator... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.diigo.com/images/v6/homepage/share.gif is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
9 images 324 KB
0 oversized -0 KB
9 legacy format
5 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
389 KB transferred, 17 requests
PASS
389 KB transferred, 17 requests
Info::
Page weighs 488 KB (389 KB transferred)
Info::
17 HTTP requests
Info::
Estimated 0.08 g CO2 per page load
389 KB / 2.4 MB budget
389 KB transferred
17 requests
0.08 g CO2 per page load
Images 324.0 KiB 83%
JavaScript 54.7 KiB 14%
CSS 4.7 KiB 1%
HTML 4.2 KiB 1%
Other 1.4 KiB 0%
0 2.4 MB 4.9 MB
Under budget
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+
JS Execution Cost
482ms total JS execution
PASS
482ms total JS execution
Info::
Unattributable: 172ms CPU time
Info::
https://www.diigo.com/: 131ms CPU time
Info::
https://www.diigo.com/javascripts/lib/jquery-1.8.0...: 94ms CPU time
Info::
https://ssl.google-analytics.com/ga.js: 85ms CPU time
Warning::
Third-party scripts: 482ms (100% of total)

Main Thread Breakdown

Other 42% Script Evaluation 32% Style & Layout 13% Rendering 6% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
Unattributable172ms7ms0ms3rd
https://www.diigo.com/131ms8ms2ms3rd
https://www.diigo.com/javascripts/lib/jquery-1.8.0.min.js?164067221094ms66ms11ms3rd
https://ssl.google-analytics.com/ga.js85ms74ms10ms3rd
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
3 scripts, 23 KB unused
PASS
3 scripts, 23 KB unused
Warning::
https://www.diigo.com/javascripts/lib/jquery-1.8.0...: 23 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 23 KB
23 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.diigo.com/javascripts/lib/jquery-1.8.0.min.js?164067221036 KB23 KB (64%)✓3rd
https://www.diigo.com/javascripts/v6/homepage/homemain.js?16406722101 KB—✓3rd
https://ssl.google-analytics.com/ga.js17 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

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
A
Page Weight Inventory
17 resources · 389 KB · 23 KB savings available
PASS
17 resources · 389 KB · 23 KB savings available
Info::
Within 1MB page-weight target
Got: 389 KB
Warning::
16 third-party resources (100% of weight)
17 resources · 389.0 KiB · 16 third-party Within 1MB page-weight target
Image 84% · 325.1 KiB
JavaScript 14% · 54.7 KiB
CSS 1% · 4.7 KiB
Document 1% · 4.4 KiB

~23.0 KiB of savings available

Remove unused JavaScript: 23.0 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
17 requests over 1124ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.9 s LCP 3.7 shttps://diigo.com// https://diigo.com/ — 301 — 190 B — 287 ms — http/1.1https://www.diigo.com/www.diigo.com/ https://www.diigo.com/ — 200 — 4.2 KiB — 313 ms — http/1.1https://www.diigo.com/front-end-utils/basic.css?1640661557www.diigo.com/front-end-utils/basic... https://www.diigo.com/front-end-utils/basic.css?1640661557 — 200 — 957 B — 78 ms — http/1.1https://www.diigo.com/stylesheets/v6/homepage_v7.css?1640672210www.diigo.com/stylesheets/v6/homepa... https://www.diigo.com/stylesheets/v6/homepage_v7.css?1640672210 — 200 — 3.8 KiB — 153 ms — http/1.1https://www.diigo.com/javascripts/lib/jquery-1.8.0.min.js?1640672210www.diigo.com/javascripts/lib/jquer... https://www.diigo.com/javascripts/lib/jquery-1.8.0.min.js?1640672210 — 200 — 36.4 KiB — 250 ms — http/1.1https://www.diigo.com/images/v6/homepage/banner.gifwww.diigo.com/images/v6/homepage/ba... https://www.diigo.com/images/v6/homepage/banner.gif — 200 — 101.0 KiB — 367 ms — http/1.1https://www.diigo.com/images/v6/homepage/collect.gifwww.diigo.com/images/v6/homepage/co... https://www.diigo.com/images/v6/homepage/collect.gif — 200 — 154.2 KiB — 440 ms — http/1.1https://www.diigo.com/images/v6/homepage/annotator.gifwww.diigo.com/images/v6/homepage/an... https://www.diigo.com/images/v6/homepage/annotator.gif — 200 — 12.6 KiB — 67 ms — http/1.1https://www.diigo.com/images/v6/homepage/organize.gifwww.diigo.com/images/v6/homepage/or... https://www.diigo.com/images/v6/homepage/organize.gif — 200 — 5.1 KiB — 76 ms — http/1.1https://www.diigo.com/images/v6/homepage/share.gifwww.diigo.com/images/v6/homepage/sh... https://www.diigo.com/images/v6/homepage/share.gif — 200 — 16.7 KiB — 149 ms — http/1.1https://www.diigo.com/javascripts/v6/homepage/homemain.js?1640672210www.diigo.com/javascripts/v6/homepa... https://www.diigo.com/javascripts/v6/homepage/homemain.js?1640672210 — 200 — 847 B — 151 ms — http/1.1https://ssl.google-analytics.com/ga.jsssl.google-analytics.com/ga.js https://ssl.google-analytics.com/ga.js — 200 — 17.4 KiB — 19 ms — h2https://www.diigo.com/images/v6/logo.pngwww.diigo.com/images/v6/logo.png https://www.diigo.com/images/v6/logo.png — 200 — 13.3 KiB — 115 ms — http/1.1https://ssl.google-analytics.com/r/__utm.gif?utmwv=5.7.2&utms=1&utmn=523717445&utmhn=www.diigo.com&utmcs=UTF-8&utmsr=412x823&utmvp=412x823&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=Diigo%20-%20Better%20reading%20and%20research%20with%20annotation%2C%20highlighter%2C%20sticky%20notes%2C%20archiving%2C%20bookmarking%20%26%20more.&utmhid=747322647&utmr=-&utmp=%2F&utmht=1776804477508&utmac=UA-295754-15&utmcc=__utma%3D45878075.1700991454.1776804477.1776804477.1776804477.1%3B%2B__utmz%3D45878075.1776804477.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=795568312&utmredir=1&utmu=qBAAAAAAAAAAAAAAAAAAAAAE~ssl.google-analytics.com/r/__utm.gi... https://ssl.google-analytics.com/r/__utm.gif?utmwv=5.7.2&utms=1&utmn=523717445&utmhn=www.diigo.com&utmcs=UTF-8&utmsr=412x823&utmvp=412x823&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=Diigo%20-%20Better%20reading%20and%20research%20with%20annotation%2C%20highlighter%2C%20sticky%20notes%2C%20archiving%2C%20bookmarking%20%26%20more.&utmhid=747322647&utmr=-&utmp=%2F&utmht=1776804477508&utmac=UA-295754-15&utmcc=__utma%3D45878075.1700991454.1776804477.1776804477.1776804477.1%3B%2B__utmz%3D45878075.1776804477.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=795568312&utmredir=1&utmu=qBAAAAAAAAAAAAAAAAAAAAAE~ — 200 — 440 B — 20 ms — h2https://www.diigo.com/images/v6/homepage/other-icon.pngwww.diigo.com/images/v6/homepage/ot... https://www.diigo.com/images/v6/homepage/other-icon.png — 200 — 20.5 KiB — 88 ms — http/1.1https://ssl.google-analytics.com/__utm.gif?utmwv=5.7.2&utms=2&utmn=13114846&utmhn=www.diigo.com&utmt=event&utme=5(Install%20Mobile*Android*Homepage%20View)&utmcs=UTF-8&utmsr=412x823&utmvp=412x823&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=Diigo%20-%20Better%20reading%20and%20research%20with%20annotation%2C%20highlighter%2C%20sticky%20notes%2C%20archiving%2C%20bookmarking%20%26%20more.&utmhid=747322647&utmr=-&utmp=%2F&utmht=1776804477625&utmac=UA-295754-15&utmcc=__utma%3D45878075.1700991454.1776804477.1776804477.1776804477.1%3B%2B__utmz%3D45878075.1776804477.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=&utmu=6BAAAAAAAAAAAAAAAAAAAAAE~ssl.google-analytics.com/__utm.gif?... https://ssl.google-analytics.com/__utm.gif?utmwv=5.7.2&utms=2&utmn=13114846&utmhn=www.diigo.com&utmt=event&utme=5(Install%20Mobile*Android*Homepage%20View)&utmcs=UTF-8&utmsr=412x823&utmvp=412x823&utmsc=24-bit&utmul=en-us&utmje=0&utmfl=-&utmdt=Diigo%20-%20Better%20reading%20and%20research%20with%20annotation%2C%20highlighter%2C%20sticky%20notes%2C%20archiving%2C%20bookmarking%20%26%20more.&utmhid=747322647&utmr=-&utmp=%2F&utmht=1776804477625&utmac=UA-295754-15&utmcc=__utma%3D45878075.1700991454.1776804477.1776804477.1776804477.1%3B%2B__utmz%3D45878075.1776804477.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=&utmu=6BAAAAAAAAAAAAAAAAAAAAAE~ — 200 — 58 B — 4 ms — h3https://www.diigo.com/favicon.icowww.diigo.com/favicon.ico https://www.diigo.com/favicon.ico — 200 — 1.2 KiB — 63 ms — http/1.1
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 482ms · 58KB · €5/mo
Unattributable
Other
Optional
Execution 172ms
Transfer 0 KB
Monthly Cost €2/mo
www.diigo.com
Other
Optional
Execution 131ms
Transfer 4 KB
Monthly Cost €1/mo
www.diigo.com
Other
Optional
Execution 94ms
Transfer 36 KB
Unused 64%
Monthly Cost €1/mo
Google Analytics
Analytics
Optional
Execution 85ms
Transfer 17 KB
Monthly Cost €1/mo

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

64% of www.diigo.com'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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