There are several types of synchronization, which may happen in JIRA Client:
- Quick Synchronization. In this case JIRA Client in one request to the server downloads details for several issues selected based on some query. This download includes most of the fields, comments, work logs, links, lists of attachments.
- Detailed Synchronization. JIRA Client does several requests to the server for a single issue. It downloads remaining fields (voters, watchers), meta data about editing, applicable workflow actions.
- Small Attachments. JIRA Client downloads smaller attachment files - up to 100Kb by default. This size can be modified through auto.download.maxsize parameter in the settings.