https://wccftech.com/kb4522355-released-windows-10-1903/

Microsoft has released KB4522355 for Windows 10 May 2019 Update (version 1903) bringing a number of improvements and bug fixes.

Today’s is a non-security update mainly focusing on performance improvements and bug fixing, including Narrator, VPN, and Start menu issues. Windows 10 1903 cumulative update KB4522355 follows the release of KB4517389 that was delivered on October 8 and KB4524147 released on October 3.