from RGiskardR's post, Windows 10 version 1803 microcode update KB4100347 http://tweakbytes.com/threads/windows-10-version-1803-microcode-update-kb4100347.6583/
I am on RS4 Build 1803 now (from RS2 1703) and it seems slower than RS2 (1703)..can't seem to get the sign-off/log-off button back had to use Classic Start Menu of Classic Shell for now.