In reply to Jason Lemieux.

I guess that even if a few modules don't have good alternatives, it's still worth benchmarking 27-30 plugins against Jetpack, both one by one, some combinations and the full stack.

+1 on the "lots of data to test" since performance impact is an exponential exercise and isn't noticeable with a few entries.

Would be nice checking in an environment of a social network (i.e. BuddyPress) or WooCommerce/EDD - just saying, knowing that it's not a full-time research study.