While there are some things that could be done such as removing some duplicate folders and language files for languages not used for your game, with that amount of custom content, those deletions won't make much difference in your load time.Ī faster computer (faster processors) would load the content faster.
It loads every piece of CC into memory at startup. TS2's load time is quite dependent on how much Custom Content you have.
30 minutes for 24 GB sounds about right and is comparable to what it takes my game to start up with about the same amount of downloads.