Step 1
Open the file in this path /wp-content/plugins/designthemes-core-features/shortcodes/js/shortcodes.js using some editor like DreamWeaver and scroll to line no: 314 approximately.
Step 2
Under the Testimonial Carousel function you can adjust the value.
Note : By default jquery consider the duration value in a milliseconds [ 1000ms = 1 sec ]
If you cannot find the code in the line number specified, just search for Testimonial Carousel in that file and you can find the relevant code.
Note
Some of our themes only has scroll option. In that kind of situation you have to modify the code as shown below below.
scroll:{items:1,duration:500},
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