Noticed that an application using OpenMP compiled with ifort 15.0.3 20150407 with the flag "-heap-arrays XXX" suffers a large performance degradation, increasing with the number of threads (on 1 thread is the same, on 8 threads it is 4 times slower, on 32 threads it is 16 times slower). This is not the case with ifort 12.1.3 20120212, the same option does not reduce the performance. Any idea why this change?