Full Width Gallery: Set speed to faster than 1 second

Hi Everyone, for my site I am looking for a fast-paced full-width gallery effect with images changing very rapidly (0.5 seconds, to be precise). But I am only able to get the speed to 1 second through settings - I looked everywhere online and I cant find a way of doing this. Is it possible ? 🙂 Thanks a lot for the help. 

The website link is: https://www.raeciclo.com/work