Is expression runScript any faster than using a script transform?

Stay away from runScript() unless it is around single digit execution time (ms). Otherwise, my understanding is you could block other tag executions.

Edit:
If you need more complicated logic in an expression, check out the Integration Toolkit by pturmel.
It can do iteration, debugging, and more. Automation Professionals' Integration Toolkit Module - 3rd Party Modules - Inductive Automation Forum

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