While I would normally agree, it should be said that the performance gap will likely only be of issue for folks who are used to working outside of Reason in other DAW but want to switch to Reason or shift much of their work over to Reason. When you're used to getting 2x or more instances of some of your favorite plugins, it's hard not to notice!
For those folks who have always been inside of Reason and/or just used RE's, this probably won't be very noticeable though.