Symptoms

Subset of users have slow performance. Others have everything working just fine. This slowdown happens across all pages within JIRA.

Diagnosis

Large number of projects. Users facing slowdown only have access to a small subset of projects. The names of the projects they have access to, are towards the end of the alphabet.

Cause

JIRA will complete a permission check when there is a single success. This check is currently performed per project in an alphabetical order. If there is a large number of projects, and the user only has permission to the ones at the end of the alphabet, they will experience slowdown at every permission check (every page).

Workaround

Create a bogus project called "A" and add users to the permission scheme here.

Resolution

The resolution here is to improve JIRA to have better performance in this scenario.  There is an improvement request filed at:  JRA-33292 - Getting issue details... STATUS