Decks loading time when using offline Spotify playlists+internet connection

I know it is not possible to use offline (i.e. without internet access) Spotify playlists but my question is: assuming I have one offline playlists with a few tracks, loading these tracks in the decks (still assuming that you need to have internet access), will still rely on the tracks being loaded from spotify Server or the loading time will be reduced because the tracks will be loaded from Spotify cache? From what I have seen, it looks like the tracks will still be loaded as if they were “online”, with no loading time decrease, but wondering if someone else tested this? Thanks