Reduce the size of large assemblies

Hello
I'm looking for a solution to reduce the size (kb) of large assemblies by keeping only the exterior surfaces for example. The idea is to merge the pieces into one. I tried the save-under but the conversions to surfaces make the file size heavier.
Thank you.

Hello

SolidWorks has several tools for simplification:

  1. SpeedPack
    SpeedPak - 2022 - SOLIDWORKS Help

  2. Defeature:
    How do I use the SOLIDWORKS Defeature tool?
    Defeature - 2022 - SOLIDWORKS Help

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