Hi Andzhela!
The fastest speed for Little Reader and Little Math is -0.2 seconds for Auto forward delay and 0 seconds for Minimum Slide Duration.
This speed can be achieved by specifically turning off Pronunciations and choosing only either images or words for the presentation.
To do this, you will need a Little Reader unlocked by a PRO key or a BASIC key.
If you already unlocked your Little Reader with a key mentioned above, click on the OVERRIDE ON button(make sure light is green) and then click on the COG wheel beside it.
Here's how your settings should look: