Please everyone update to version 1.5.8 - as the performance for directional searches has been seriously improved. Typical impact analysis generally consist of only inward (or only outward_links. Therefore, we developed an All Inward and a All Outward with optimized search capacity.
For a behaviour as former versions, you may simply select All Inward + All Outward, which remains the same.
Impact for JIRA explained
Impact for JIRA helps you analyze your project issues and how they are bound together. As a reminder, issues can be linked together to create relations between them. These relations can be of different types:
Issues may relate to one another, such as two Tasks depending on each other
One issue may verify another one, such as a Test which can validate a Task, or a Requirement.
Issue may be linked together for structure purposes, such as Stories linked to an Epic.
Issue may block another one, for instance, a Bug may block the development of several Tasks
Issue may be linked together to show functional dependency
Issues may be duplicated
Issues may be inserted in a Confluence page ("mentioned in")
When the number of issues within a project is large, it becomes very useful to link them, allowing better analysis process (in Bug Review Meetings, in Sprint Plannings, etc.)