In order of importance :-)

1. Get to recognise conventions used by other players in sketches (such as a purring cat for "perfect" and a sitting person getting up for "stand"). Learn how the simple or more common sketches are usually done.

2. Relax! Don't bother guessing unless you actually think you understand the sketch. E.g. Early on when a stick figure is all that can be seen, the chances of winning with simple guesses like "man" or "person" are low and typing your guesses may distract you from watching the sketch unfold. (Instead, see whether there is anything odd the way the stick figure was drawn.)

Another small benefit is that if you are on the right track and the sketcher tells you by drawing an arrow to you, you can pick it up more easily.

3. Pre-empt other players if possible. E.g. when a car is drawn, it may be possible to guess "driver" or "bumper" early. "Teakettle" is another good one.

4. Fast typing helps but isn't everything - getting the correct version of a word or phrase is more important.