enhancement: when built with :sb-core-compression, core files (regular or executable) can be compressed with zlib. Use the :COMPRESSION argument to SAVE-LISP-AND-DIE to specify a compression level.

gzipみたいに1-9とかなら1で良さそうだ。
lzo系統の要望は無かったのかな。
http://dayafterneet.blogspot.com/2011/05/google-snappy.html