App is slow
YouniqMail is built for large mailboxes. If things get slow anyway, it pays to look at what exactly is slow: that narrows the cause better than any blanket measure.
While the sync is running
Section titled “While the sync is running”The first sync of a large account and the loading of many contents keep the processor and disk noticeably busy. It is temporary: once the collection is in place, calm returns. How far the loading has got is shown on the dashboard and under Settings → Advanced, see Sync.
Persistently sluggish: the usual suspects
Section titled “Persistently sluggish: the usual suspects”Debug logging turned on. It records a great deal and slows things down in the process. If you turned it on for support, turn it off again under Settings → Advanced.
Little free disk space. The database needs room to work. When the drive fills up, everything suffers, YouniqMail included, and the cleanup at startup (see below) is skipped. Freeing space works wonders here.
Security software inspecting every file change. The mail database is written constantly; a virus scanner inspecting every access individually slows it massively. An exception for the app’s data directory speeds things up noticeably. The paths are under Where the data lives.
What happens on its own
Section titled “What happens on its own”YouniqMail takes care of some upkeep without you doing anything. At startup it checks the database for consistency in the background and writes the result to the log. If a lot of space is unused or the search index is bloated, it tidies up before the window opens, at most once a week and only with enough free disk space; a small Database Maintenance window shows this. Caches such as the one for attachments are bounded continuously. There is therefore no “clean up database” button of its own.
For special cases, Repair Email Bodies and Rebuild Email Threads are available under Settings → Advanced.
Measure instead of guessing
Section titled “Measure instead of guessing”If it stays slow, support is helped most by knowing which action dawdles: switching folders, opening individual emails, searching, startup? Together with the logs the cause is usually found quickly: with debug logging turned on, many operations write their duration in there. Turn it off again afterwards.