Microsoft's New Outlook Delays Email Notifications by 10 Seconds on Windows 11
Updated
Updated · WindowsLatest · Jun 15
Microsoft's New Outlook Delays Email Notifications by 10 Seconds on Windows 11
2 articles · Updated · WindowsLatest · Jun 15
Summary
Clicking a Windows 11 email alert in Microsoft's new Outlook can take about 10 seconds to open the targeted message, even though opening the app manually and selecting the same email can be faster.
WebView2 drives the lag: the app must resume multiple browser-like processes, authenticate, load the mail thread and render it, instead of jumping straight to the message like Outlook Classic.
Resource use highlights the gap. New Outlook runs about 10 processes, uses roughly 490-636 MB of idle RAM and around 4% CPU, versus Classic's single process, 117-148 MB RAM and under 1% CPU.
Microsoft has improved the app with March-May 2026 feature updates and plans more additions in July and August, but it already pushed the enterprise forced-switch deadline back to March 2027.
That leaves Outlook Classic as the more reliable option for notification-heavy workflows; it remains supported through April 2029 while Microsoft keeps pushing the WebView2-based replacement.