Debugging to get more info (client-side)
Client-side: if you want to get more detailed information concerning e.g. JavaScript Errors or Performance figures, please read the console output within your browser.
Step-by-step guide
Open your browser's console:
Select tab "Console", which can vary depending on your browser
See sample video at https://polscheit.de/plugins/jira/group-sign-off/videos/getBrowserConsoleLogs.movSelect tab "Network", which can vary depending on your browser and have a look for AJAX-calls not resulting in HTTP-200 (= okay) and provide that information, too.