performance tune 2010 web app

Question

I would like to know what I can check on to view the performance of a 2010 web form C# application. To accomplish this goal, I have the following questions:

1. Is there a web page analyzer that can be run against the web form applicationso that we can see exactly what is being loaded and what takes the most time to load?

2. Can view selectively turn off session state? If so, how do you accomplish this goal?

3. Can I selctively turn off view state? If so, how can I selectively turn off viewstate? Are there cases where I need to keep view state around? If so, when do I need to keep viewstate setup?

4. Are there other items I can check on to monitor the performance of a website? If so, hwat are they and how do you use them?