Many of us rush through speeches because public speaking makes us nervous. You need to speak slowly for a good speech. To get that right, talk at the pace you would when telling someone a phone number.
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Katie Schwartz of Business Speech Improvement says speaking slowly helps the audience understand you better, and it makes you sound more confident too:
A good benchmark is to speak slow enough that, if you were reciting a phone number, the person listening to you would be able to write it down. Practice your speech speed by reciting a long string of numbers, and writing them in the air as you do so. That's just about the perfect cadence.
6 Simple Ways to Improve the Way You Speak [Fast Company]