Please update the MonsterWriter to up the electron version, as it can affect Mac users. more details here: Electron GitHub issues discussing this: fix: MacOS 26 Tahoe - stop overriding private cornerMask API to fix WindowServer GPU load electron/electron#48376 Electron-based apps cause a huge system-wide lag on macOS 26 electron/electron#48311 The macOS Tahoe (macOS 26) WindowServer API that is affected is cornerMask or _cornerMask A script, from a trustworthy source, that will show if if apps on your system are affected by this bug: https://furbo.org/2025/10/06/tahoe-electron-detector/ MonsterWriter.app (Electron 30.0.6)