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Hierarchies could take a long time in order to be fully built in memory at the server and they can be quite expensive in server resource terms (CPU, memory, threads…). Therefore some  optimizations are supported by Links Hierarchy in the server to ensure the performance and reliability of Jira while thousand users build and view hierarchies:

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If loading the issue links reaches the timeout, then the issue is painted with a red border and the user can continue loading the links manually by clicking on the expand button:

The plugin also supports some improvements at the client side for scaling like caching and queues. I.e: all the calls to Jira are queued in the browser to avoid overload Jira.