It looks like project, component and version autocomplete fields do not use AJAX and load the whole set of values into browser memory. This makes all aforementioned fields not really scalable. I had delays up to 20 seconds upon opening CreateIssue dialog in configurations with several thousands (up to 4) of projects or components and versions
Is there any recommended way to go around this behavior and avoid pre-loading all project, component, and version values?
It is not configurable but you should be able to modify the related velocity templates and load them as you want. For example, loading projects is controlled using atlassian-jira/WEB-INF/classes/templates/jira/issue/field/project-edit.vm.
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