CDBIとDBICのパフォーマンス比較

DBIx::ClassのMLより

I've just replaced Class::DBI with DBIx::Class in a small app that I wrote. One of the pages is displaying about 250 rows of complex data which the user did not want paged. The loading time decreased from 4 seconds under Class::DBI to 1.5 seconds under DBIx::Class.

との、メールが流れる。
そこまで違うものなのか。時間があったらベンチ取って見ますか。