How does selective perception work as a shortcut in judging other people?

Bits and pieces of what we observe are chosen randomly.

It allows us to "speed$-$read" without the risk of inaccurate conclusions.

Bits and pieces of what we observe anow us to judge people with complete accuracy.

Bits and pieces of what we observe are selectively chosen according to our interests and background.

Such observations allow us to arrive at warranted judgments quickly.