I can confirm the problem and workaround. I only had 408 rows, but I have done a factory reset recently. Removing all except one, made the dictionary lookup a lot faster.
The bug is probably that rows are not being deleted. The database updates tend to be an insert and a delete, rather than updating the existing row. And it isn't updating the EventCount properly. The row doesn't show what you looked up, just when and the total number of lookups.
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