My MathCAD seems really slow.  R13 on a duo-core Pentium at 2Ghz, 2GB Ram, 200Gb hard drive.  I don't have any solve blocks, matrix calculations or graphs.  I only reference two external text files.  No recursive calculations and very little Boolean logic.  A few simple If statements, otherwise just * + - / square root and square.  It just seems to take too long.  I always save as R12.mcd because the load and save was too slow otherwise.  What can be done to speed up calculations?