Pushka, I don't know about "regular basis". I add a lot of books cuz Calibre makes it so easy and I have a couple of DVD ebook collections with tens of thousands of books and I want to read them all. Then I feel the need to trim the collection down to what I really can read. So I delete a lot of books and that leaves the search indexes for the deleted books causing slowdowns.
If all you do is add to your Kindle then you don't need to remove the indexes. Even if you have deleted a few books it might not be worth the time and effort. But if you delete 50, 100 or more books over time then it might be worth the indexing time it takes. And you probably already know that indexing is a battery drainer, that is why I leave it plugged in. If I am reading by an outlet it is just as easy to read with it plugged in. It will still index unplugged but you won't have much charge by the time it is done.
Yes, you would remove the files in the search index folder. On my Kindle it's Kindle O:\system\Search Indexes. Open the Search Indexes folder and delete all the files in it. There should be a .db, .lg and a file for every book on your Kindle. Delete them all. The .db and .lg will be recreated when you eject the Kindle and it starts to index. Bricorn indexed for 6 hours for about 300 books. I indexed for 36 hours for 1300 books. YMMV if you have mostly large books, I have a broad mixture of pulp novels, historical fiction, encyclopedias and graphic intensive books. My Que software books seem to take forever.
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