Need best answer of below Testing questions asked in interview

I need some best answers of below question asked in interview.These were asked in recent software testing interview.

1)If your team want to develop a video streaming service for a particular client what are the first three steps that you are going to consider and why explain.

2)If your website is competitor to linked in or Facebook and you have delivered one feature which is not available with your competitor,but before start celebrating some of the users/client started complaining about the slowness or performance of the feature with the new release. what are the different steps you will perform to analyse the root cause.