AFAIK every time the user navigates to a folder in the library RuneAudio queries MPD and generates a fresh file/folder list and that results in delays/long loading time for folders with a lot of files/subfolders. For example on my Android one folder with a lot of songs in it takes around 6 seconds to load every time, even if I only navigate out of it and navigate back.
Will the next major RuneAudio release cache such file/folder lists for quicker loading? A cached listing could be useful also for browsing by album, artist and genre.