Pictures thumbnails

Hello all, I need some help with kodi please …
First, this is my configuration : I have an android box TV player, Himedia q10 pro, with android 7 firmùware and kodi 17.1 installed
Now, my problem is related to thumbnails of pictures : indeed, I got folders with thousand of pictures and kodi 17.1 takes more time to generate thumbnails … before, in kodi 16.1 “Jarvis”, thumbnails were generated more fast
So my question is : Is there a way to generate thumbnails more fast with v17.1 ? I always have to wait for thumbnails coming in each pictures and I dont have time because there is mor than 1000 pictures …
Please help !