And in between, at the coma, revise seriously your indexing policy and don't hesitate to remove unused and underused index (even on foreign key if you don't need them that much). People too often underestimate the impact of rebuilding and index on large inserts.
Pat Helland has some really good writing on this stuff, e.g. https://pathelland.substack.com/p/i-am-so-glad-im-uncoordina...