Not sure if anyone else has run into this issue, but when I'm using one of the premium themes like 'My vintage room one' or 'my arcade room one', the video previews are really slow to play and are jittery when they actually do play. They don't seem to play at all when using the 'my arcade room one' theme. However, if you switch to something like the 'Base' theme, all the issues go away.
Any idea what would be causing that with the premium themes if it's normal with the base one? I would really like to use the vintage one, but not if the preview videos don't play smoothly.