[EventPhotoMan]

The Kwilt hardware/software creates thumbnails for each for quick internet. This means Kodi is doing double the work.

Kodi has used its caching system since the beginning of XBMC some 15 years ago.
Why should it suddenly use some other software's method of thumbnails usage?
Perhaps your 'kwilt' package should adapt to Kodi.

Caching is simply saying to store for quick aaccess. What Kodi is caching I do not know.
Is it caching the thumbnails?

In kwilt, I’m assuming the choose to store the thumbnail on disk for web access and to avoid re-generating ever time kwilt starts.

For me generating thumbnails can take up to 12 hours.