The timeouts depend upon the client device used, the Mezzmo app on android can handle large folders with thousands of artists but other devices have limits. Some TVs will limit you to a few hundred folders per level while others will try to load them all and timeout. Mezzmo can handle the large libraries but it is the devices that have problems when browsing the files, in Mezzmo you can customize your playlists to be displayed how you like and also browse your folder structure but this can create problems on some devices. The active playlists in Mezzmo support dividing your artists based upon the first letter so this allows supporting browsing on devices where the number of folders is limited.