The KB4482887 update which was rolled out to Windows 10 October 2018 Update PCs on March 1, bumping the build to 17763.348, has been found to degrade performance under certain conditions.
Build 17763.348 RSS
While every other version of Windows 10 got cumulative updates late in February, 1809 was the only one missing. Today, Microsoft released Windows 10 build 17763.348 for that version.