Change the text-to-speech voice rate

In Control Panel, double-click the Speech icon.
Select the Text To Speech tab.
Move the Speed slider to change the rate of the text-to-speech voice. By default, it is set to normal.
Click Preview Voice to hear the currently selected voice at the new rate; the text will be spoken, highlighting the words as they are spoken.

Notes

To open a Control Panel item, click Start, point to Settings, click Control Panel, and then double-click the appropriate icon.