I’ve tried LO 6 which I had to uninstall due to huge instability and laggishness. install 5.4 (less largish but not smooth at all). Besides other minor issues, if I create/open/import a presentation in Impress, I apply 3d transition (i.e. cube, 3d Venetian and so on) and it simply doesn’t work. When I go to presentation mode (F5) I change the slide but no animation is played. on the other hand, basic transition works though very very slow.