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Best to download smaller batches. As things download it starts indexing and that will degrade performance to point where things don't work. Maybe less than 100 at a time, then given it a rest so indexing finishes before the next batch.
You can check indexing status by searching for '.' and tap on Text in Books search result. If it is enabled, it's indexing and you can see how many items are left to index.
Keeping thousands of books on device is possible, but every update will trigger reindexing and make it unusable until it is done, it can take hours.
The storage is better used for audiobooks and maybe B&W manga/comics, and not to see how many books you can carry around (you can only read one at a time!). IMO of course.
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