Multiple times happened by now, that because the login is so slow, it causes an inactivity logout immediately. (by login I mean from the user/password to character chooser screen login)
Apparently the thing the login waiting on for 5 minutes(!!) is either the RENDERER or the DYNAMIC_OBJECTS
2018-05-23T13:59:27.150Z Load Screen - Waiting On: DYNAMIC_OBJECTS, RENDERER, TEXTURES, CHARACTER_ACTIVATED,
2018-05-23T14:04:01.929Z Load Screen - RENDERER Complete
2018-05-23T14:04:01.929Z Load Screen - Waiting On: TEXTURES, CHARACTER_ACTIVATED,
2018-05-23T14:04:01.929Z Load Screen - DYNAMIC_OBJECTS Complete
2018-05-23T14:04:01.929Z Load Screen - Waiting On: TEXTURES, CHARACTER_ACTIVATED,
2018-05-23T14:04:04.958Z Load Screen - TEXTURES Complete
(server: pc/eu, os: mac)