[4.3] why do streamed levels need 15 s to load/unload?

Development World Creation
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1

Hi,

Since 4.3, all my streamed levels take between 10 and 15 secondes to load/unload.

This happens in the editor (toggle level visibility) and in game (when overlapping streaming level volumes).

It was working fine in 4.2.1, in case it helps.

Are there some default values/behaviors that have been modified in 4.3 and that i should be aware of ?

Thanks

Cedric