The reading speed of the synthesised voice can be adjusted.
If very slow reading is required, we recommend to use the pause options.
Punctuation pause adds extra pauses when there is a comma, period or exclamation mark allowing you some extra time to process the meaning of each sentence.
Word pause adds extra pauses in between words to add extra time to process the meaning of each word. The reading becomes less fluent with these pauses but the words are more accurately pronounced than if slowing down reading speed too far.
Try different combination of these three settings to find what is better for you.
Check this video for more details.