Consolidate several Oracle triggers. Any performance impact?

Question

Most of our tables have one BEFORE INSERT OR UPDATE trigger, in order to set ID\'s BEFORE INSERT and to set creation / modification users / dates <

Answer 1

I know there's a significant difference in redo generation between no triggers and a single trigger, but not about a difference between 1 and n triggers. However, I can't imagine there isnt a hit, as there would be more context switching between the SQL and PL/SQL engines.