Publicly shaming someone is not allowed under the code of conduct. To report someone cheating, refer to this post on the subject:
In the mean time, please edit your post to remove the player’s ID.
Edit: that being said, someone else playing faster than you does not necessarily mean they are cheating. Since you are playing the same deck, you probably know that if you play cards fast enough (before the end of the turn) the animation for such plays can queue up and take much longer than the 75s you have on your turn to play out. See this extreme example, where a single turn took 45h to play out:
https://youtu.be/O22HqSvpAxs?t=1362