Some of us speak faster when they’re nervous. Some of us are naturally fast talkers. Regardless of your motivations, conscious or subconscious, speaking too quickly is an indication of a lack of authority or a lack of confidence!
In addition, while speaking quickly, you're more likely to make mistakes in your enunciation, and you have less time to think through your words.
Focus on speaking more slowly in your conversation, allowing your words to draw out and giving your sentences a weightier rhythm.
Your audience will have more time to digest the words you're speaking, and you'll be less likely to make any critical errors that compromise your speaking integrity.
- Jayson Demers (modified by Amr Badran)