[rschiks]

Small question about the "cache" for movies.

Movie images (cover film) are cached? because I think it is relatively long to load every time I go out of the category "film" and I come back in, I feel that the cache load time is long.

I's normal?

The images are always cached but requires a connection with Kodi. It always checks if nothing is changed. There could be another movie poster. When you have enabled caching, the data retrieved will be written to a file on your device.
The next time you go to movies again, it will use the file. The images are checked again. Of course it depends on your device. An iPad Air 2 can process data a lot faster than an iPad 2. If you have 20 movies or 2000 movies also matters. During development I definitely noticed a difference, especially with large databases.
The cached becomes invalid if you have changed data, for example, if the watched status changes.