The 1803 update really did a number on my 7 (almost 8) year old desktop.
After the update the start menu stopped working, which arguably is a upgrade not a downgrate, but anyway.
Also as part of the update process Microsoft had 'helpfully' reverted the driver for my RAID to a old Microsoft one. Which resulted in stupidly long DCP calls pretty much totally killing performance of the system.
Luckily the fix while time consuming was rather simple.
Fiddle with some BIOS settings to disable the old Intel RAID. Change disks from RAID to AHCI. I actually pulled out the RAID a while back, because the system was working, I didn't fiddle with BIOS, cos if it ain't broke!
Fixing the start menu not working was a case of doing a in-place 'upgrade'.
Still, none of that should have to have been done if the update wasn't a total untested turd.