Microsoft has released the KB4601380 non-security update for all editions of Windows 10, version 1909, and Windows 10 version 1809, with fixes for screen rendering and Microsoft Defender for Endpoint high resource usage issues. The update is considered optional given that it is a Windows preview update and it will not be installed automatically. Microsoft advises users to install the latest servicing stack update (SSU) before this cumulative update is deployed to minimize udpating issues. After installing it, Windows 10 will be updated to build 18363.1411.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-kb4601380-update-fixes-screen-rendering-issues/