Google Software Engineer interview questions

There was an online round with a fairly straightforward coding problem. After that I was invited on-site to a 4 or 5 round interview, each time solving a problem on a whiteboard with a different Google engineer. The emphasis was on speed, which was bad for me because I arrived really late the night before and was not in my sharpest state. I did not get an offer and the feedback was simply that I was "too slow" for their liking.

Smooth process. Good questions. I have not able to crack the interview but process was smooth. Prepare dsa well and donsql questions. Do design pattern questions. Trees graphs etc are all important