I just added the '64 bits platform' to my project and my Delphi (XE7) keeps generating a huge RSM file (which increases the compilation time). According to the Help this should not happen if the 'Include remote debug symbols' option is disabled.
And in my case it is disabled.
There is something else to be disabled?
from http://embarcadero.newsgroups.archived.at/public.delphi.ide/201203/12030416462.html
and continuing on http://www.devsuperpage.com/search/Articles.aspx?G=2&ArtID=20168
Jeff Overcash from TeamB