Massive disk usage in last 3.10 updates

Hi,

take a fresh 3.10 7081: 16MB
Update is to 7091: 36MB

I follow the update process to determine what took that much space:

- Update 7087 takes 6MB (http://ftp.squeak.org/updates/7087TallySupport.cs)
- Just before saving the image size is 23MB
- Just after saving it is 36MB

Does someone have any idea?

--
Damien Cassou