[gentoo-user] a question about updating process

[behrouz khosravi]

hello everyone.
I was trying to emerge chromium and I noticed that it should download about
200 Mb, and no wonder cause it is source files, not binary executable.
However I wanted to know that if a new version of chromium comes out, an
update will download another 200 Mb or just a diff files to patch the
altered files ? (I am a new user and I have not experienced that situation!)
Regards