I didn’t know you could scrape data for media not defined as a source in Kodi. How would you tell Kodi what kind of content it is and which scraper to use?
In any case, for TV content maybe have a look at this similar thread:
https://discourse.osmc.tv/t/library-scan-very-slow-then-fails-to-update/72106?u=phydeaux
Cheers,
Robert