Thanks Trill
The only thing that changed for us in the last 3 weeks is the different software versions.
ArcSDE has been working pretty much like clockwork for the last 18 months. Editing is still ok from ArcCatalog. Albeit it a little slow. But editing performance is severely impaired through the ArcGIS Web architecture.
I don't think our issues are driven from the database but more the middleware (ArcGIS Server_ security context.
The portal 10.3 upgrade is also (a lot) shabby in terms of client waiting.
Problems with ESRI Maps for Office as well. Slow to authenticate. Functionality is totally changed,
The best we can do is to keep an issues register,
Susan