Hi, Did you ever solve this? We have exactly the same thing happening here. SQL Spatial Views created in 10.3 are terribly slow in Arcmap 10.4, i.e. a spatial view loaded into Arcmap 10.3.1 takes around 20 seconds to load, the same view takes 19 minutes to load in ArcMap 10.4. As a test, I've created a fresh SQL database using the tools in ArcGIS 10.4, imported only the couple of datasets involved in the spatial view and freshly created the spatial view in this new database. Exactly the same result, seconds to load in 10.3.1, minutes in 10.4. Like Drew, our web services using these spatial views with ArcGIS Server 10.4 are so terribly slow I have had to remove the spatial views and use other datasets to keep them up and running. Both old and new SQL databases are SQL Server 2012, both have READ_COMMITTED_SNAPSHOT and ALLOW_SNAPSHOT_ISOLATION enabled. Any advice? Thank you. Steve
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