To increase the speed of One page scroll slideshow, please, go to Theme files/ronneby/assets/js/jquery.onepagescroll/
on line 13 you’ll find this line and change 1000:
var slideshow_speed = 1000;
For example, if you change 1000 to 700, the slideshow speed will be faster;
if you change 1000 to 1500 the slideshow speed will be slower.
But if you need to change the speed of One page scroll slideshow 3D, please,
go to the Theme files/ronneby/assets/js/jquery.onepagescroll/ on the line 32 you’ll find the line where you can change
the speed of DFD 3d style -1 , lower you can change the speed of 3d style-2 and style-3.
Then, please, go to the file /wp-content/themes/ronneby/assets/less.lib/components and find layout-settings.less.
In this file, please, find the line 446 and change the speed on the highlighted place of the 3d style you use.
For example, changing the speed from 0,5 to 7, the scroll will work slower.
Regards, DFD Support Team.