[azido]

What you discribe happen on my setup when kodi write new images to the db. When its done everything is fast again

Example 2 - changing where thumbnails are stored
Note: This will slowdown thumbnail loading, but might be worth it for low-memory devices.

http://kodi.wiki/view/Path_substitution

Maby try it without path substitution, see if its faster

I already did that substitution, on the android tv box as libreelec boots from sd i substituted the thumbnails to internal memory as there is plenty and it's faster than the sd card. On firetv box i substituted to the above smb path on NAS (where the movies/albums are). Fun thing is: normal posters/fanarts & stuff is readed fast from both substitutions (on firetv box by nature a little slower than on android tv box because of smb, but still usable) but on those two views where it comes to "live" displaying content, it's slow on both machines.

At least i'm happy to see it's not only me. I guess i give it a try to let kodi write all images, even the live one, and see if it's faster afterwards.