Activity chaining is used to show forms in succession , then how activity chaining can decrease the performance .
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When you are using activity chaining the chained nodes would run with first priority. If unnecessary activity chaining is done then this would impact the process execution engines if multiple instances are being triggered or often launched. Unless until you have a huge number of nodes and too many subprocess nodes in your model, I don't think you should be worried about it.
Thanks for the clarification.