expand only current saved search on (+)

In my very large database, it takes 5 minutes to expand a saved search containing 7 parent items with the (+) shortcut. I assume it's because Z expands the entire db first, then narrows to the current saved search. Would it be possible to narrow the search first, then expand?

A few small problems like this (the other one is no delay for many autocompletes) make it very difficult to work with a large database.

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