In the case of custom fields- if you fetch them in a single query to the database, fetching one or ten is not going to differ much, it’s the same relatively simple query in both instances. If you were to do a lot of complex meta queries on those fields you’d definitely see a performance hit.
I think same for taxonomy, if you’re doing complex taxonomy queries, that’s a big hit. Simple queries to fetch terms are relatively cheap.
Searching will certainly tax the server more if you’ve got ten times as much data, text searches are pretty expensive.
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