Reduce mobi file size by changing parameters of kindlegen tool.

Kindlegen tool adds the epub content to mobi file.
If we want to reduce output size, we can use parameters of "-dont_append_source" and "-c2".
 
I have a book named "越讀者" and I will show you the differences.

Original epub : 82,307 KB
"default" : 177,313 KB
"-dont_append_source" : 95,007 KB
"-dont_append_source -c2" : 94,725 KB
"-dont_append_source -gif" : 98,838 KB
"-dont_append_source -gif -c2" : 98,557 KB