[quote=livemas]80% of the uncompressed level cache seems to be the same thing repeated over and over. Removing all that and repacking seems to fix the issues, shorter load times and no freezing, but gives a warning that the same has been tampered with.
...[/quote]

I'm glad that worked. I didn't want to try because the duplicated items seemed to have references to their handles in other parts of the file, but it looks like I was either mistaken, or the file is parsed in an order which is insensitive to them (or your game will explode at some later date).

I wonder if the tamper warning is caused by errors during parsing or a failure of the embedded MD5sum or both. Does anyone know if there is a technical description of the levelcache and what it is used for?