After a brief review in the ring to preview the Insider version of the program, Microsoft released Windows 10 1903 build 18362.329 (KB4512941) to the production ring – albeit as an optional update. Although the update packages were the same for the compilations that were released on the Release preview ring, only the May 2019 update package was put into production since 19H2 is still in testing. However, as it turns out, although the cumulative update resolves a bunch of issues, some users are not experienced.
Reddit users began to report that after installing the latest cumulative update, CPU usage reached a large number, even when the system was idle and unused. Most users who report this performance issue have noticed that high CPU usage comes from Cortana (especially the SearchUI.exe process, as noted in Task Manager). In addition, the taskbar search functionality also seems to be malfunctioning to those who have affected this problem, with the search flash becoming blank when clicked.
Interestingly, several insiders did provide feedback on this issue at Hub for feedback. However, since construction was not offered to Insiders long enough before it went into production, the problem seemed to have escaped. To add to it, the issue did not gather enough updates to gain attention. One would expect the company to wait for more feedback on Insider Preview compilations to better address any such issues.
Microsoft has not yet officially acknowledged the error. KB's article on this compilation also does not list any known build issues. While there are several solutions to this problem, such as setting up specific registry entries, we recommend that you do so only if you are familiar with editing registry keys. Accidentally deleting or editing incorrect registry entries can cause additional problems.
Alternatively, Windows 10 Pro users can navigate to Settings -> Windows Update -> View Update History and uninstall the problematic update. For those who have not yet installed the update, it is best not to. The next cumulative update should contain fixes to this compilation and we should also hopefully correct the performance issues caused by Cortana. Whether the problems will really be fixed before the next round of Patch Tuesday updates, no one has guessed.
The most recent updates have generally been problematic for Microsoft, with the latest firmware updates of Surface Pro 6 and Book 2 also causing problems with CPU shutdown processes. These hiccups are really disturbing as the company explained its renewed focus on quality after the Windows Update Debate on October 10, 2018
Source: Reddit (1) (2) via WindowsLatest | Task Manager photos: DefinitiveYou (Reddit User)