I've seen in this forum a long time ago some tutorial how to load "sublevels" in realtime where new parts of landscape are loading in realtime.
Don't remember where exacly.

But you can still make f.e. invisible block and attach all near object to that block.
Then if player is close enough to that box (f.e. trigger) this box creates new object near him by ent_create; This way your level will be loading faster because only small part of the level will be loading at start.
Just suggestion