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https://outlook.office.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
89
GRADE
B
FIX
1
REVIEW
4
PASS
10
INFO
1

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

53
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
54
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.

5.79 s

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

7.68 s

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

364 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.

5.79 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.

7.82 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
16
10 PASS 4 REVIEW 1 FIX
D
Third-Party Impact
Action
97% third-party, 0 ms blocking
FIX
97% third-party, 0 ms blocking
Warning::
Third-party code accounts for 97% of page weight (702.1 KiB of 721.2 KiB)
Info::
Third-party blocking time is low (0 ms)
97%
First-party Third-party
B
Image Optimization
6 images, 0 KB saveable
REVIEW
6 images, 0 KB saveable
Warning::
https://aadcdn.msauth.net/shared/1.0/content/image... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
6 images 19 KB
0 oversized -0 KB
6 legacy format
1 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

C
JS Bundles
Action
12 scripts, 194 KB unused
REVIEW
12 scripts, 194 KB unused
Warning::
https://aadcdn.msauth.net/shared/1.0/content/js/as...: 108 KB unused (95%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://res.public.onecdn.static.microsoft/owamini...: 56 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://aadcdn.msauth.net/shared/1.0/content/js/on...: 30 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 194 KB
194 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://aadcdn.msauth.net/shared/1.0/content/js/asyncchunk/convergedlogin_pcustomizationloader_45fabe6597885bd9dd3e.js114 KB108 KB (95%)3rd
https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.74228.js3 KB56 KB (32%)3rd
https://aadcdn.msauth.net/shared/1.0/content/js/oneDs_36c085e9e54fe9d23a54.js60 KB30 KB (50%)3rd
https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.miniindex.js130 KB3rd
https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.9777.js2 KB3rd
https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.53840.js87 KB3rd
https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.13939.js8 KB3rd
https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.19444.js1 KB3rd
https://aadcdn.msauth.net/shared/1.0/content/js/ConvergedLogin_PCore_iXvvVEAQxmEXtWhahp1L2Q2.js124 KB3rd
https://aadcdn.msauth.net/ests/2.1/content/cdnbundles/ux.converged.login.strings-en.min_cbb9wf1-2b8knjgxpc5-rg2.js17 KB3rd

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

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

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache

DirectiveValueMeaning
no-cacheCache but always revalidate first
A
Page Weight Budget
721 KB transferred, 37 requests
PASS
721 KB transferred, 37 requests
Info::
Page weighs 2.2 MB (721 KB transferred)
Warning::
JavaScript is 588 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 588 KB
Info::
37 HTTP requests
Info::
Estimated 0.15 g CO2 per page load
721 KB / 2.4 MB budget
721 KB transferred
37 requests
0.15 g CO2 per page load
JavaScript 588.4 KiB 82%
Fonts 46.7 KiB 6%
HTML 31.1 KiB 4%
CSS 22.0 KiB 3%
Images 18.8 KiB 3%
Other 12.9 KiB 2%
Other 1003 B 0%
Other 296 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under 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

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
A+
Font Loading
3 fonts (47 KB)
PASS
3 fonts (47 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

47 KB total

Render-blocking

0

of 3

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 6.0 s 7.0 s 8.0 s FCP 5.8 s LCP 7.7 shttps://res.public.onecdn.static.microsoft/assets/owa-mini/fonts/roboto/roboto-400.woff2roboto-400.woff2 https://res.public.onecdn.static.microsoft/assets/owa-mini/fonts/roboto/roboto-400.woff2 — 15.5 KiB — 15 ms — font-display: swaphttps://res.public.onecdn.static.microsoft/assets/owa-mini/fonts/roboto/roboto-500.woff2roboto-500.woff2 https://res.public.onecdn.static.microsoft/assets/owa-mini/fonts/roboto/roboto-500.woff2 — 15.7 KiB — 19 ms — font-display: swaphttps://res.public.onecdn.static.microsoft/assets/owa-mini/fonts/roboto/roboto-700.woff2roboto-700.woff2 https://res.public.onecdn.static.microsoft/assets/owa-mini/fonts/roboto/roboto-700.woff2 — 15.6 KiB — 16 ms — font-display: swap
roboto-400.woff2 woff2 swap
Size 15 KB
Load time 15 ms
Start 164 ms
Risk FOUT — text flashes from fallback to web font
roboto-500.woff2 woff2 swap
Size 16 KB
Load time 19 ms
Start 165 ms
Risk FOUT — text flashes from fallback to web font
roboto-700.woff2 woff2 swap
Size 16 KB
Load time 16 ms
Start 166 ms
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)
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
14 hints, 0 missing preconnects
PASS
14 hints, 0 missing preconnects
Info::
Page uses 14 resource hint(s)

Current Resource Hints

preconnect
3
preload
+1
11
dns-prefetch
prefetch

14 resource hints configured

A
Page Weight Inventory
37 resources · 721 KB · 194 KB savings available
PASS
37 resources · 721 KB · 194 KB savings available
Info::
Within 1MB page-weight target
Got: 721 KB
Info::
~194 KB of savings available
Warning::
33 third-party resources (97% of weight)
37 resources · 721.2 KiB · 33 third-party Within 1MB page-weight target
JavaScript 82% · 588.4 KiB
Font 6% · 46.7 KiB
Document 5% · 33.2 KiB
Image 4% · 29.4 KiB
CSS 3% · 22.0 KiB
Other 0% · 1.5 KiB

~193.6 KiB of savings available

Remove unused JavaScript: 193.6 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
37 requests over 3388ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 5.8 s LCP 7.7 shttps://outlook.office.com// https://outlook.office.com/ — 301 — 188 B — 37 ms — h2https://outlook.office.com/mail//mail/ https://outlook.office.com/mail/ — 200 — 8.5 KiB — 57 ms — h2https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.miniindex.cssres.public.onecdn.static.microsoft/... https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.miniindex.css — 200 — 1.4 KiB — 26 ms — h2https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.miniindex.jsres.public.onecdn.static.microsoft/... https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.miniindex.js — 200 — 130.3 KiB — 43 ms — h2https://res.public.onecdn.static.microsoft/assets/framework/microsoft.svgres.public.onecdn.static.microsoft/... https://res.public.onecdn.static.microsoft/assets/framework/microsoft.svg — 200 — 2.1 KiB — 26 ms — h2https://res.public.onecdn.static.microsoft/assets/owa-mini/fonts/roboto/roboto-400.woff2res.public.onecdn.static.microsoft/... https://res.public.onecdn.static.microsoft/assets/owa-mini/fonts/roboto/roboto-400.woff2 — 200 — 15.5 KiB — 15 ms — h2https://res.public.onecdn.static.microsoft/assets/owa-mini/fonts/roboto/roboto-500.woff2res.public.onecdn.static.microsoft/... https://res.public.onecdn.static.microsoft/assets/owa-mini/fonts/roboto/roboto-500.woff2 — 200 — 15.7 KiB — 19 ms — h2https://res.public.onecdn.static.microsoft/assets/owa-mini/fonts/roboto/roboto-700.woff2res.public.onecdn.static.microsoft/... https://res.public.onecdn.static.microsoft/assets/owa-mini/fonts/roboto/roboto-700.woff2 — 200 — 15.6 KiB — 16 ms — h2https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.9777.jsres.public.onecdn.static.microsoft/... https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.9777.js — 200 — 1.9 KiB — 17 ms — h3https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.74228.jsres.public.onecdn.static.microsoft/... https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.74228.js — 200 — 3.0 KiB — 16 ms — h3https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.53840.jsres.public.onecdn.static.microsoft/... https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.53840.js — 200 — 87.2 KiB — 30 ms — h3https://login.microsoftonline.com/organizations/oauth2/v2.0/authorize?client_id=9199bf20-a13f-4107-85dc-02114787ef48&scope=https%3A%2F%2Foutlook.office.com%2F.default%20openid%20profile%20offline_access&redirect_uri=https%3A%2F%2Foutlook.office.com%2Fmail%2FoauthRedirect.html&client-request-id=c313bcb5-b5d3-f90c-2ed4-7d95361bfb97&response_mode=fragment&client_info=1&clidata=1&prompt=none&nonce=019db15f-49f6-7bed-b3b9-d4185a3e4be7&state=eyJpZCI6IjAxOWRiMTVmLTQ5ZjUtN2Y1My1hYzk1LTY5MGYyODg3MzJmZCIsIm1ldGEiOnsiaW50ZXJhY3Rpb25UeXBlIjoic2lsZW50In19%7CaHR0cHM6Ly9vdXRsb29rLm9mZmljZS5jb20vbWFpbC8&claims=%7B%22access_token%22%3A%7B%22xms_cc%22%3A%7B%22values%22%3A%5B%22CP1%22%5D%7D%7D%7D&x-client-SKU=msal.js.browser&x-client-VER=4.30.0&response_type=code&code_challenge=PWzjL38grmA-fH7HHU1tD7RSuiDv3R9kI39pP7aRie0&code_challenge_method=S256login.microsoftonline.com/organizat... https://login.microsoftonline.com/organizations/oauth2/v2.0/authorize?client_id=9199bf20-a13f-4107-85dc-02114787ef48&scope=https%3A%2F%2Foutlook.office.com%2F.default%20openid%20profile%20offline_access&redirect_uri=https%3A%2F%2Foutlook.office.com%2Fmail%2FoauthRedirect.html&client-request-id=c313bcb5-b5d3-f90c-2ed4-7d95361bfb97&response_mode=fragment&client_info=1&clidata=1&prompt=none&nonce=019db15f-49f6-7bed-b3b9-d4185a3e4be7&state=eyJpZCI6IjAxOWRiMTVmLTQ5ZjUtN2Y1My1hYzk1LTY5MGYyODg3MzJmZCIsIm1ldGEiOnsiaW50ZXJhY3Rpb25UeXBlIjoic2lsZW50In19%7CaHR0cHM6Ly9vdXRsb29rLm9mZmljZS5jb20vbWFpbC8&claims=%7B%22access_token%22%3A%7B%22xms_cc%22%3A%7B%22values%22%3A%5B%22CP1%22%5D%7D%7D%7D&x-client-SKU=msal.js.browser&x-client-VER=4.30.0&response_type=code&code_challenge=PWzjL38grmA-fH7HHU1tD7RSuiDv3R9kI39pP7aRie0&code_challenge_method=S256 — 302 — 2.1 KiB — 123 ms — h2https://outlook.office.com/mail/favicon.ico/mail/favicon.ico https://outlook.office.com/mail/favicon.ico — 200 — 9.7 KiB — 15 ms — h2https://outlook.office.com/mail/oauthRedirect.html/mail/oauthRedirect.html https://outlook.office.com/mail/oauthRedirect.html — 200 — 791 B — 48 ms — h3https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.13939.jsres.public.onecdn.static.microsoft/... https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.13939.js — 200 — 8.1 KiB — 34 ms — h3https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.19444.jsres.public.onecdn.static.microsoft/... https://res.public.onecdn.static.microsoft/owamini/20260417.02/scripts/owa.19444.js — 200 — 809 B — 36 ms — h3https://login.microsoftonline.com/common/oauth2/v2.0/authorize?client_id=9199bf20-a13f-4107-85dc-02114787ef48&scope=https%3A%2F%2Foutlook.office.com%2F.default%20openid%20profile%20offline_access&redirect_uri=https%3A%2F%2Foutlook.office.com%2Fmail%2F&client-request-id=c313bcb5-b5d3-f90c-2ed4-7d95361bfb97&response_mode=fragment&client_info=1&clidata=1&prompt=select_account&nonce=019db15f-4ae4-744b-84e3-b73ca9c20e7a&state=eyJpZCI6IjAxOWRiMTVmLTRhZTMtNzA3Yy04OTk3LWU0ZmFjMTg2MjQwZiIsIm1ldGEiOnsiaW50ZXJhY3Rpb25UeXBlIjoicmVkaXJlY3QifX0%3D%7CaHR0cHM6Ly9vdXRsb29rLm9mZmljZS5jb20vbWFpbC8&claims=%7B%22access_token%22%3A%7B%22xms_cc%22%3A%7B%22values%22%3A%5B%22CP1%22%5D%7D%7D%7D&x-client-SKU=msal.js.browser&x-client-VER=4.30.0&response_type=code&code_challenge=oLW_SeZZB-_UAgHY-HunCjR5Z77HGaWFSc2GZxkMcCQ&code_challenge_method=S256login.microsoftonline.com/common/oa... https://login.microsoftonline.com/common/oauth2/v2.0/authorize?client_id=9199bf20-a13f-4107-85dc-02114787ef48&scope=https%3A%2F%2Foutlook.office.com%2F.default%20openid%20profile%20offline_access&redirect_uri=https%3A%2F%2Foutlook.office.com%2Fmail%2F&client-request-id=c313bcb5-b5d3-f90c-2ed4-7d95361bfb97&response_mode=fragment&client_info=1&clidata=1&prompt=select_account&nonce=019db15f-4ae4-744b-84e3-b73ca9c20e7a&state=eyJpZCI6IjAxOWRiMTVmLTRhZTMtNzA3Yy04OTk3LWU0ZmFjMTg2MjQwZiIsIm1ldGEiOnsiaW50ZXJhY3Rpb25UeXBlIjoicmVkaXJlY3QifX0%3D%7CaHR0cHM6Ly9vdXRsb29rLm9mZmljZS5jb20vbWFpbC8&claims=%7B%22access_token%22%3A%7B%22xms_cc%22%3A%7B%22values%22%3A%5B%22CP1%22%5D%7D%7D%7D&x-client-SKU=msal.js.browser&x-client-VER=4.30.0&response_type=code&code_challenge=oLW_SeZZB-_UAgHY-HunCjR5Z77HGaWFSc2GZxkMcCQ&code_challenge_method=S256 — 200 — 19.7 KiB — 285 ms — h2https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=0browser.events.data.microsoft.com/O... https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=0 — -1 — 0 B — 0 ms — https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=0browser.events.data.microsoft.com/O... https://browser.events.data.microsoft.com/OneCollector/1.0/?cors=true&content-type=application/x-json-stream&w=0 — -1 — 0 B — 0 ms — https://login.live.com/Me.htm?v=3login.live.com/Me.htm?v=3 https://login.live.com/Me.htm?v=3 — 200 — 0 B — 70 ms — http/1.1https://aadcdn.msauth.net/ests/2.1/content/cdnbundles/converged.v2.login.min_pzfy2abhlubh6bv_dyvwha2.cssaadcdn.msauth.net/ests/2.1/content/... https://aadcdn.msauth.net/ests/2.1/content/cdnbundles/converged.v2.login.min_pzfy2abhlubh6bv_dyvwha2.css — 200 — 20.6 KiB — 25 ms — h2https://aadcdn.msauth.net/shared/1.0/content/js/ConvergedLogin_PCore_iXvvVEAQxmEXtWhahp1L2Q2.jsaadcdn.msauth.net/shared/1.0/conten... https://aadcdn.msauth.net/shared/1.0/content/js/ConvergedLogin_PCore_iXvvVEAQxmEXtWhahp1L2Q2.js — 200 — 124.3 KiB — 30 ms — h2https://aadcdn.msauth.net/ests/2.1/content/cdnbundles/ux.converged.login.strings-en.min_cbb9wf1-2b8knjgxpc5-rg2.jsaadcdn.msauth.net/ests/2.1/content/... https://aadcdn.msauth.net/ests/2.1/content/cdnbundles/ux.converged.login.strings-en.min_cbb9wf1-2b8knjgxpc5-rg2.js — 200 — 17.3 KiB — 24 ms — h2https://aadcdn.msauth.net/shared/1.0/content/js/oneDs_36c085e9e54fe9d23a54.jsaadcdn.msauth.net/shared/1.0/conten... https://aadcdn.msauth.net/shared/1.0/content/js/oneDs_36c085e9e54fe9d23a54.js — 200 — 60.2 KiB — 21 ms — h2https://aadcdn.msauth.net/shared/1.0/content/js/asyncchunk/convergedlogin_pcustomizationloader_45fabe6597885bd9dd3e.jsaadcdn.msauth.net/shared/1.0/conten... https://aadcdn.msauth.net/shared/1.0/content/js/asyncchunk/convergedlogin_pcustomizationloader_45fabe6597885bd9dd3e.js — 200 — 114.4 KiB — 8 ms — h2https://aadcdn.msauth.net/shared/1.0/content/js/asyncchunk/convergedlogin_pfetchsessionsprogress_fac053f592dc42159692.jsaadcdn.msauth.net/shared/1.0/conten... https://aadcdn.msauth.net/shared/1.0/content/js/asyncchunk/convergedlogin_pfetchsessionsprogress_fac053f592dc42159692.js — 200 — 5.9 KiB — 6 ms — h2https://aadcdn.msauth.net/shared/1.0/content/images/marching_ants_white_8257b0707cbe1d0bd2661b80068676fe.gifaadcdn.msauth.net/shared/1.0/conten... https://aadcdn.msauth.net/shared/1.0/content/images/marching_ants_white_8257b0707cbe1d0bd2661b80068676fe.gif — 200 — 2.2 KiB — 8 ms — h2https://aadcdn.msauth.net/shared/1.0/content/images/marching_ants_986f40b5a9dc7d39ef8396797f61b323.gifaadcdn.msauth.net/shared/1.0/conten... https://aadcdn.msauth.net/shared/1.0/content/images/marching_ants_986f40b5a9dc7d39ef8396797f61b323.gif — 200 — 2.5 KiB — 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