AutoPlay Speed in free version

In the free version altering the AutoPlay Speed makes no difference (for me). Is this intentional but available in the pro version?

I am looking to buy the business or agency license pack but reluctant if this is a conflict with a theme I use regularly.

I have tried turning off all other plugins except woocommcerce and Product Slider for WooCommerce and it made no difference.

The site is currently in development on my computer so I can’t provide a link as yet.