Microsoft is speeding up the Teams desktop client for Windows

Microsoft says it will add a new Teams call handler beginning in January 2026 to reduce launch times and boost call performance for the Windows desktop client.

A new process, ms-teams_modulehost.exe, will be used after rollout to handle calling features under the primary ms-teams.exe app process, according to Microsoft.

“We’re improving the performance and startup time of calling features in the Microsoft Teams Desktop Client for Windows,” it announced in a new message center update for enterprise customers.

“To achieve this, we’re introducing a new child process named ms-teams_modulehost.exe that will handle the calling stack separately from the main application process (ms-teams.exe). This change optimizes resource usage and enhances meeting experiences.”

This architectural change will not affect user workflows or require additional end-user training, and the calling features will function identically from the user perspective, with performance improvements…