On 10 Sep 2019, at 4:02pm, mailing lists <[email protected]> wrote:

> Insertion really slows down after about 100 000 items have been inserted. I 
> suppose that the slow down is related to indexing because:
> 
> [...]
> c) changing the cache size has only a minor impact

SQLite speed does degrade with table size, but it degrades gracefully.  
Depending on which OS you're using, you have at least three caches in play.  A 
sudden change in speed indicates that you just bust one of those caches, as you 
wrote.  But in this case it's probably the OS's memory cache assigned to your 
program.
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