Just having to load the BIMServer libraries each time is already a few hundred megabytes, even if it is only for the ArchiCad14 library.
I think you'll definitely feel the difference.
regards
Haneef
Haneef Tayob
Aziz Tayob Architects
AC23 INT rel 3003, OS X 10.14.6 iMac 3.3ghz i5 dual monitor, 24GB RAM