Teams Efficiency Mode lands in May to rescue low-spec PCs from Electron bloat

Microsoft is shipping an Efficiency Mode for Teams on Windows and Mac in early-to-mid May 2026, enabled by default on devices with constrained CPU and memory. The mode dynamically downscales outbound camera resolution during meetings and skips pre-loading a chat on launch, showing a static placeholder instead to cut startup cost. Users who don’t want the degraded experience can disable it via Settings > General with a ‘Never use efficiency mode’ toggle.

Alongside the performance work, Microsoft is stacking several messaging-security features onto Teams. A June release adds end-user reporting for suspicious external accounts and a Security Detection Report in the admin center consolidating impersonation attempts, malicious URLs, and weaponizable file types, with export for investigation workflows. Third-party bots will also be auto-tagged in meeting lobbies so organizers can gate their entry, extending the existing call-reporting and impersonation-warning features rolled out earlier this year.

The direction is telling: Teams has become heavy enough that Microsoft now treats hardware-constrained as a first-class user segment, while simultaneously hardening the platform against the social-engineering and phishing surface that external messaging created in the first place.