[sualfred]

Do you have the Genres assigned as widgets?
That's the only thing, which can cause the stuttering in my opinion.

Possible reason:
- 4 square items
- 3 poster images for each square item
- Kodi renders them in a mask with transparent areas, which can cause a higher load while the items are moving.

If you have added your own posters without resizing, you'll have another possible speed penalty.