The data became heavy when I stretched the textures

This data is very heavy to work with.
The data itself is not heavy at 26 MB.
It became heavy when I put textures on solids.
However, I disassembled the solid parts and put the texture on one surface, and it became lighter.

Is there a problem with the way the textures are applied?
I would like to know if anyone knows the cause.

AAA_06-03-24.3dm (18.6 MB)