Problem
You are unable to log on to Web Client after upgrade from IM2018R1 to 2019 (SPF or SDX) as the generation of the OData model takes too long.
Reason
Your system exposes objects in OData metadata using abstract relationship definitions (RelDefs). Navigation defined using abstract RelDefs causes a significant performance impact on the generation of the OData model because a large number of objects have to be exposed. This affects logging onto the Web Client.
Solution
From SDx Update 32, abstract relationship definitions are not supported in the OData metadata. You cannot define navigation to expose object types in OData using abstract RelDefs, which means the generation of the OData model no longer has a performance impact that affects logging on to the Web Client.