They respond quickly by email during the interview process but slow after the third interview. The first interview using review had ten different questions, and they will look at your respond to determine the next schedule appointment. The second interview was more laid back and friendly, including clarification of basic information. The third interview was with the people involved in the project that you will be doing during the entire interview. It was hard to get a hold of them after the third interview. However, they probably had a lots of email to respond to, so I can understand them from that perspective.