When adding multiple members to Outlook Calendar, you may experience slow performance due to how the system loads calendar data for each user. This behavior is expected and not caused by a system-wide issue.

🧭 Key Points

• No known incidents have been reported in Microsoft 365 or Outlook Calendar health
• The slowdown is likely due to the real-time loading of calendar data for each added member
• Factors such as network conditions, device performance, and browser behavior may also contribute
• This is a common limitation in cloud-based services where multiple variables affect responsiveness

📌 Recommendations

• Add members gradually to reduce system load
• Use the web version of Outlook Calendar for potentially smoother performance
• Ensure your network connection is stable and your browser is optimized (e.g., clear cache, close unused tabs)
• If performance remains poor, consider scheduling via shared calendar links or using smaller group views