Hi, you can submit a Ticket for this kind of questions, since we don't give support in the Forum.
The slider speed settings can be found in custom.js too. It's better to edit this file rather than slider.js file, since it has the default slider values (slider.js), which is recommended to not modify them.
So, in custom.js file you can find this settings:
timeout:1, (length of pause on screen )
speed:2500, (Speed of transition)
Edit them to fit your need.