'How to eliminate waiting time in the Google Vision API(OCR)？

I have been requesting the Vision API to read text from base64 encoded images from AWS lambda.

At that time, I found out that when I made consecutive requests, there could be a waiting time of about 10 seconds.

To confirm this, I kept making requests at 1 request/second for 1 minute, and the event occurred 3 times in 3 minutes (about 180 requests).

I would like to know how I can eliminate the 10 second waiting time.

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