that is ok. A file gets 1.5 to 5 times bigger when it is shared with TW 2.0.
Take a look at archicadwiki.com > Teamwork
EDIT:
Oh, just saw, that you ar eusing TW 1. Then it is NOT normal. You should compress the file by ArchiCAD automatically
Holger Kreienbrink Director Product Intelligence Munich, Germany Archicad since Version 5.... If I sound too harsh, please forgive me: I am German.
In TW1 I occasionally would see a some file bloat. It would depend on individual file settings and setup. But I've never seen it bloat that much.
In TW2 the shared file is no longer a .PLP file - It is a dynamic database file that is more efficient for the client-server delta technology. We tested the file size in a TW2 file by copying the entire 3D model multiple times within the file itself... We were surprised that the file did not bloat proportionally. But the database now stores much more than just the model data so the file will grow during the project file lifespan.