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I have ported a code from FORTRAN95 to MATLAB. Replicated it almost exactly. About 500 lines in length, it contains a lot of double precision arithmetic and nested iterations. Very little linear algebra.

Under MATLAB R2008b it executes in 7.3 seconds. Compiled under Compaq Visual Fortran 6 it takes 375 milliseconds. Under the Intel Fortran 11 compiler, it takes 473 MICROseconds. These times are for a WinXP system, Core 2 Duo 2 GHz (4MB L2 Cache), 2GB RAM...

Is this possible? Is MATLAB this slow or am I doing something wrong?