And that is why I let you guys test out the new OSes before installing them on my devices! 
I have noticed some weird things in iOS 12.3.1 with iCloud. Namely that Notes doesn't seem to always update to the iCloud and then to my various iOS, Mac OS devices. It is super sluggish on occasion. I had never encountered that issue in the past. It eventually gets things synced, but it sometimes takes a while. And no, it is not a WiFi issue on my end as the WiFi is operating fine at 200Mbps. I first started noticing this issue in the past week or two. It is sporadic though, and often works correctly.
ETA: Corrected typo where "
Notes does seem to always update to the iCloud" was changed to "
Notes doesn't seem to always update to the iCloud."