my fortran compiler has very slow running times with Visual Studio 2019. Just before I used Geany and shell commands in Linux.
To test VS I run a program ( with two step sizes) . The calcuation times are 2 and 145 seconds with Geany/Linux. But with VS it takes 10 and 810 seconds. So it is much slower.
Then I tried the windows command shell and the running times are compared to the Linux ones.
I tried to set everything to fast speed in the VS compiler options, but it didn't improve anything.
What can there be wrong?