Completely agreeing with everyone. The problem is you are making it work too hard. Trust me. Smaller batches will get done faster than all at once. I know my Fire threw tantrums if I did more than 100 without taking a short break.
I know it sounds counter-intuitive but it needs a bit of time to process.
For anyone else reading, this is the reason Amazon limits the deliver to device to 10 at a time.
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