Activity chaining is a feature that allows users to complete multiple tasks in a row without returning to their task list. However, activity chaining can also have some drawbacks, such as increased memory consumption, longer transaction times, and reduced user feedback. Therefore, some actions can be taken to make the process model more efficient, such as:

Shorten long process chains by combining transactions into the smallest number of nodes. This can reduce the memory footprint and the database load of the process model.

Avoid chaining system nodes like Integrations. These nodes can have unpredictable execution times and can cause timeouts or errors if chained. It is better to use asynchronous integrations or message events to decouple the process flow from external systems.

Move transactions that can be done asynchronously outside of the chain. This can improve the responsiveness of the process model and allow parallel processing of independent tasks.

Therefore, the correct answers are B, C, and D.

References:

Activity Chaining

Performance Best Practices