Introducing the new Microsoft Teams | Microsoft 365 Blog
Microsoft rebuilt Teams from the ground up, promises 2x faster performance | TechCrunch
it optimized the Teams data, network, chat and video architecture to achieve this. A significant part of this enhancement also results from the app’s transition from Electron to Microsoft’s Edge WebView 2 rendering engine. Microsoft also notes that it moved from using AngularJS as the web development framework for Teams to React for building the user interface and standardized on Microsoft’s Fluent UI UX controls.