'More haste, less speed' is a phrase my mother -who was very wise- would use. It means you (usually) make better progress with a task if you don't try to do it too quickly.
This is a good thing to remember especially when we are busy trying to complete several tasks. Often, if we simply 'slow down' and focus on one task at a time, we end up accomplishing far more. Understandably, this can be difficult especially when deadlines are looming. But...where we can... let's seek to find balance.