check 7-zip.chm file
> Command Line Version
> a [Add]
7z commandline sometimes not flexible enough for some special cases....
do not use Ultra Mode for big files,
Ultra Mode (Maximum Compression) is for special cases.......
Maximum Compression: It will take quite long time
and size gain is very low = not efficient
Default ( Normal ) compression is very efficient and get good enough compression with good speed.
Development on computer and generally on engineering is about efficiency,
not about getting smallest size or maximum speed or .....
It is not efficient to use fastest plane on public transport,
Public Plane Developers do not work on fastest plane but other things....
Something to Keep in mind on your plugin developments