GameObject in Asset Bundle three times the expected size

Unity Engine
1

We pack scenes into Streamed Scene Asset Bundles using BuildPipeline.BuildAssetBundles(path, builds.ToArray(), BuildAssetBundleOptions.ChunkBasedCompression, buildtarget);

The assetbundles however get larger than I would expect.
Looking at the content using the Asset Browser Tool (Unity - Manual: Unity Asset Bundle Browser tool) I see that game objects are reported with a much larger size than I would expect.

For example, this GameObject is reported with 33MB. However, it only contains a meshfilter and meshrenderer, with the mesh referenced by the meshfilter being only about 10MB in size:

So, what could be the reason for this bloat?

2

Could be lots of things. Some places to look:

  • baked lighting

  • unexpected bloat from texture import settings

  • gameobject refers to a lot more than you think it does, which then gets included.