Windows image snapshot folder size is very large

[daishuqin1]

Hi,
I need import 5 windows images into containerd. All of these 5 images are used the same base windows image mcr.microsoft.com/dotnet/runtime:8.0-windowsservercore-ltsc2022 which size is 4 GB.
And the 1st image will create a 1 GB text file on new layer, the 2nd image create 2 GB text file, the 3rd image create a 3 GB text file, the 4th image create a 4 GB text file, the 5th image create a 5 GB text file.
The total size of all these 5 images = 4GB + 1GB + 2GB + 3GB+ 4 GB+ 5GB = 19 GB.
But I see the snapshotter folder size increase to 52 GB, this is much bigger than expect!
containerd\root\io.containerd.snapshotter.v1.windows

My question are:

1. Is this the normal behavior?
2. Can I compress the snapshot file?
3. Why docker desktop does not have these snapshot files?

Thanks!