I'm not totally sure I understand the question. Are you looking for tips on how to write a competitive analysis deck? I wish I had any insights here because anything you do that's going to be high quality will require time. For instance, you could just throw a bunch of screenshots in a deck - that won't take any time but won't be any good. One thing you could try is just focusing on the most important tasks/aspects of the user journey (instead of documenting every task and flow). Good luck!