Skip to content
https://diigo.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
2
REVIEW
2
PASS
9
INFO
1

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

Mobile Desktop
90
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.

1.30 s

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

1.62 s

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

0 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.

1.30 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.

1.62 s

Page Load Progression

450 ms
899 ms
1.3 s
1.8 s
2.2 s
2.7 s
3.1 s
3.6 s
Checks
14
9 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 (400.1 KiB of 400.3 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
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
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.
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/organize.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10 images 335 KB
0 oversized -0 KB
10 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
400 KB transferred, 18 requests
PASS
400 KB transferred, 18 requests
Info::
Page weighs 499 KB (400 KB transferred)
Info::
18 HTTP requests
Info::
Estimated 0.08 g CO2 per page load
400 KB / 2.4 MB budget
400 KB transferred
18 requests
0.08 g CO2 per page load
Images 335.3 KiB 84%
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
No JS execution data
PASS
No JS execution data
Info::
No significant JS execution detected

Main Thread Breakdown

Other 43% Script Evaluation 29% Style & Layout 16% Rendering 6% Script Parsing & Compilation 4%
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
18 resources · 400 KB · 23 KB savings available
PASS
18 resources · 400 KB · 23 KB savings available
Info::
Within 1MB page-weight target
Got: 400 KB
Warning::
17 third-party resources (100% of weight)
18 resources · 400.3 KiB · 17 third-party Within 1MB page-weight target
Image 84% · 336.5 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
Network Waterfall
18 requests over 1284ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.3 s LCP 1.6 shttps://diigo.com// https://diigo.com/ — 301 — 190 B — 284 ms — http/1.1https://www.diigo.com/www.diigo.com/ https://www.diigo.com/ — 200 — 4.2 KiB — 366 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 — 75 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 — 151 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 — 246 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 — 437 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 — 63 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 — 84 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 — 163 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 — 189 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 — 35 ms — h2https://www.diigo.com/images/v6/homepage/aw.pngwww.diigo.com/images/v6/homepage/aw... https://www.diigo.com/images/v6/homepage/aw.png — 200 — 11.4 KiB — 111 ms — http/1.1https://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 — 146 ms — http/1.1https://ssl.google-analytics.com/r/__utm.gif?utmwv=5.7.2&utms=1&utmn=1687059380&utmhn=www.diigo.com&utmcs=UTF-8&utmsr=800x600&utmvp=1350x940&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=404926762&utmr=-&utmp=%2F&utmht=1776804491522&utmac=UA-295754-15&utmcc=__utma%3D45878075.1029503371.1776804492.1776804492.1776804492.1%3B%2B__utmz%3D45878075.1776804492.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=321640011&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=1687059380&utmhn=www.diigo.com&utmcs=UTF-8&utmsr=800x600&utmvp=1350x940&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=404926762&utmr=-&utmp=%2F&utmht=1776804491522&utmac=UA-295754-15&utmcc=__utma%3D45878075.1029503371.1776804492.1776804492.1776804492.1%3B%2B__utmz%3D45878075.1776804492.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=321640011&utmredir=1&utmu=qBAAAAAAAAAAAAAAAAAAAAAE~ — 200 — 440 B — 19 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 — 169 ms — http/1.1https://ssl.google-analytics.com/__utm.gif?utmwv=5.7.2&utms=2&utmn=638668776&utmhn=www.diigo.com&utmt=event&utme=5(Install%20Extension*Chrome%20Extension*Homepage%20View)&utmcs=UTF-8&utmsr=800x600&utmvp=1350x940&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=404926762&utmr=-&utmp=%2F&utmht=1776804491665&utmac=UA-295754-15&utmcc=__utma%3D45878075.1029503371.1776804492.1776804492.1776804492.1%3B%2B__utmz%3D45878075.1776804492.1.1.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=638668776&utmhn=www.diigo.com&utmt=event&utme=5(Install%20Extension*Chrome%20Extension*Homepage%20View)&utmcs=UTF-8&utmsr=800x600&utmvp=1350x940&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=404926762&utmr=-&utmp=%2F&utmht=1776804491665&utmac=UA-295754-15&utmcc=__utma%3D45878075.1029503371.1776804492.1776804492.1776804492.1%3B%2B__utmz%3D45878075.1776804492.1.1.utmcsr%3D(direct)%7Cutmccn%3D(direct)%7Cutmcmd%3D(none)%3B&utmjid=&utmu=6BAAAAAAAAAAAAAAAAAAAAAE~ — 200 — 58 B — 9 ms — h3https://www.diigo.com/favicon.icowww.diigo.com/favicon.ico https://www.diigo.com/favicon.ico — 200 — 1.2 KiB — 62 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback