Testimonial widget > problems with general latency and space between items when

The Testimonial Widget doesn’t work correctly anymore when I ad more then 3 testimonials. With only 3 testimonials as in the demo the Testimonial Widget works fine. But with 11 testimonials like in my project I encounter 2 major issues :

1) You have to scroll deeply after the Testimonial main title appears to see the different testimonials appearing otherwise you only see the main Testimonial title. This happens when you scroll the website from the beginning or when you click on the Testimonial link in the top navigation menu : a lot of empty space after the main Testimonial title before you see the testimonials itself. This very long latency appears when you visit the website for the first time.

2) The testimonials appear in 3 columns as default. In the third column the different testimonials follow each other closely. But in the first and second column there’s really a big gap in between the testimonials and they don’t follow up closely as in the third column.

Tested on FF and Chrome. Both problems are visualized in this little screencast: : https://screencast.com/t/pqkDDca8sF

Any ideas or solutions? Thanks!