When you give Build Agent markdown files with parameters and constraints, it has to reference those rules every time it develops and iterates. That's what slows it down. It's not a performance issue but instead it is the trade-off of structure. You get better outputs by constraining the agent, but it takes longer to get there. If you're seeing slower Build Agent runs, check whether you've added markdown instruction files. That's probably why. ServiceNow Build Agent performance tips