This summary should explain in simple terms what you did, why you did it (your goal), how the application behaved, and what you can recommend that would improve performance. This is the highest level of report and, depending on the experience of the manager you’re giving this to, may be the only thing that some people read. So make it easy to read, as free of technical jargon as possible, and with very simple tables. If possible, put findings in bullet points.