'Slowness' in the Bible

The Lord is not slow about his promise, as some people understand slowness, but is being patient with you. He does not want anyone to perish, but wants everyone to repent.

And consider the patience of our Lord [His delay in judging and avenging wrongs] as salvation [that is, allowing time for more to be saved]; just as our beloved brother Paul also wrote to you according to the wisdom given to him [by God],