Hello valiano,
It′s the Tiles Grid. At the moment I have to use the Nextgen-plugin for my large galleries.
Link: https://www.farbenkugel.de
But I would prefer using the Unite-plugin, if only this loading of all thumbnails could stop! I wonder why you implemented the pagination, when at the same time all thumbs are being loaded. And the gallery has at the moment up to 300 images.
Please help, I like the Unite-gallery very much, specially because it works with the svg-Format. Then for sure I will buy another year of support;-)
Regards,