What's the ideal speaking pace?

For English, 130-160 words per minute is the optimal pace for presentations (backed by NCVS and University of Michigan research). The comfortable range is 110-180 WPM. Slow to 110-130 WPM for complex technical information. Above 180 WPM causes a 22% drop in comprehension. For non-native speakers, aim for around 140 WPM.