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The description shown below is the top answer as voted by the Spotlight community.

The charts are based on 2.1 TB of data collected from 4207 instances uploaded by 323 Spotlight users over an 8 week period.

EXTERNAL_SCRIPT_PREPARE_SERVICE

Category: Other
SQL Server versions: 2016, 2017

What is EXTERNAL_SCRIPT_PREPARE_SERVICE?

Never

This wait has never occurred recently

EXTERNAL_SCRIPT_PREPARE_SERVICE has not occurred recently on 4207 instances checked.

Prevalence of EXTERNAL_SCRIPT_PREPARE_SERVICE across the Spotlight Population