Hi dear, I’m glad you managed to solve all the issues 
First of all, you need to understand where these slowdowns are coming from.
If you’re using DynamicComponents, the problem is likely there, until all the objects are created, the app will be frozen.
If you want to do a practical test, try keeping only one movie in the database and see if it loads faster (since it has to create just one object, it should be almost instant).
Another issue could be the images, if they are loaded via URL, they also need to be downloaded temporarily, which slows down the loading.
Instead of using TinyDB, I would recommend using an extension for image caching, this topic could help.