File gets really big after saving again. (VRay)

Hi guys,

I have a quite complex file with lots of VRay textures, I’ve kept it nice and clean, it’s 123mb. But here is my problem - when I open the file I’ve saved yesterday and save again it becomes 700mb+ instantly. The only way to keep it small is to use the “-saveAs” command and save it without plugin data. Then the file is 123mb again but useless for rendering. I need the data because it’s my render file. I thought it might be due to the rendering meshes but “save small” is not helping. Any ideas? 700mb is not the end of the world but I’m worried it might multiply its size yet again in the future, so I’d like to keep it small.