No repro steps, attached project "833543.zip" which creates 1k UnityEvents on Start

This is by desing because it's to ensure we create an event object instance of the right type in the inspector. The type name is in the serialized property, but not qualified, meaning we could have conflicts (a type T in UnityEngine and UnityEditor and two different namespaces in the user project), so this type is to determine the event paramenters count/type/ etc.

The problem is that this is something specific to solve a problem in the inspector(Editor) but at runtime it does not seem to be useful and it's consuming considerable amount of memory, and quite significant on low end devices.