Artificial delay in node trees in Umbraco 15+?

Curious if anyone else has noticed this behavior.

We have a client with Umbraco 15.4.4 currently.
When we expand a node in the node tree, there might be one or more content nodes.

In the case where there are multiple ones there is some weird loading behavior on the nodes showing up in view.

First there is a network request that fetches all the children. This request might take 30ms. The response includes info on all the direct descendants.

However, the items are rendered in the list one by one, often quite slowly, like 50ms-100ms delay between each one.

I was expecting to see some websocket stream or similar going on that was slowly receiving the data to explain this behavior, but checking the network panel it seems all the items are already received from the first request. The delay is simply.. client side?

Is there some network loading going on I can’t see?