Changing transition time between slides in slider?

I’m testing use of this theme on a new site which is not public yet. So far I really like it.
I wanted to change the transition time between slides. I counted and it seemed like the transition time was by default about 6 seconds. I wanted to change it to between 3 and 4 seconds.

I’m not a javascript programmer but I can do some basic code review to try and figure out where things are and modify a setting.
I found what looks like to be the file where this setting is:
…\wp-content\themes\consulting\lib\scripts\plugins\ResponsiveSlides\responsiveslides-call.js

In it there is a setting called:
// Set transition time between slides
if ( ! jQuery( this ).closest( ‘.rslides-container’ ).attr(‘data-speed’) ) {
slideSpeed = 6000;

To test whether or not this was the right setting I changed it to 1000.
I cleared the cache in my browser (not using a cache on the site yet since it’s in development).
The transition speed then changed to 1 second and I figured that was right setting.
I then then changed the setting to 4000 and cleared browser cache.
However it seems now that the transition is still 1 second.
I tried another browser but it’s the same. I tried changing it back to 6000 but it’s not responding.

I don’t know if this is outside the scope of theme support but if you don’t mind can you tell me what is going on and what am I missing in trying to change this setting etc?
Thanks for any help!