bulkDelete() for large number of primary keys is way too slow

[thusitha-cs]

I'm using Dexie.js for something experimental. Everything seems good except the delete() or the bulkDelete(). I have a situation that I need to delete more than 100k records from the IndexedDB, and even for 100k records, it takes around 10s, which is not acceptable.
I used both functions and based on my experience bulkDelete() works faster. But still that's too much of time.
Do we have any known limitations to delete operations in Dexie? If so, do we have a way to go around it somehow?