Maybe I'm not using this correctly but In my experience the example script does not work when creating an item. Because the item has not yet been created and the link has not been created the validator simply throws an exception every time I click "Create".
Placing the validator at the next transition always works however.
Highly unlikely for that script to cause a CPU spike.
Try something more simple, like just throwing an exception every time
import com.atlassian.jira.issue.IssueFieldConstants import com.opensymphony.workflow.InvalidInputException throw new InvalidInputException("You must link a blocker issue at this transition")
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