| Aleksey_WMDE added a comment. |
Apparently, the "prefetching"/buffering is done for LabelDescriptionLookup services, so that when the label/description of particular item/property is to be shown multiple times (e.g. the item appears several times on a page), the label/description is only fetch ones from the storage, and then kept in a in-memory buffer until the end of request.
AFAIK, the main reason it exists is to load all the labels for the properties to be displayed on a page in a single query. I've found code doing it for the client, but don't see this for the entity page (I remember it was there, but things have probably changed).
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