, correct. as of today, the arm processors found in samsung's chromebooks are underperformers compared to their intel counterparts.
as far as ram performance goes, if you're an octane benchmark person (like many chromebook people), you'll notice that the octane scores don't vary much when comparing 2gb to 4gb on the same machine, i.e., the c720 2gb scores the same as the c720 4gb.
that being said, real world "feel" is probably the most important. a lower benchmark score doesn't mean anything if it still feels fast. for example, my 2012 samsung intel chromebox scored higher than my c720 chromebook on the octane test, but the c720 feels faster.