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)