Clearing retrieved external entities

Dear community,   For a project we have multiple applications, for which application A retrieves data from app B & C using Data Hub External Entities (purple non-persistent entities in domain model).   Using a scheduled event we retrieve high volumes of the external entities. However it seems that these high volumes result in high CPU load on the application, which results in temporary shut down. As this is unwanted, I am trying to find answers to the following questions:   Does external entities also end up in the garbage collection? How can I clear cached external entities?
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