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There are three configurable parameters to tune links hierarchy in order to adapt it to each customer's environment. :
Timeout: (ms)
Sleep interval (ms)
Sleep duration (ms)
Despite the default configuration is very conservative, it works well in most of the cases.
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In Jira, every call to the server from a client it is attended by a thread. Threads are a limited resource in the Operating System and mainly in the Java Virtual Machine (JVM), therefore, it is important do not block threads for a long time to avoid Jira become becomes unresponsive. Every time that a hierarchy ask for data to the server, a thread is consumed form the JVM's threads pool.
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