-fast option with graphics libraries

Hi,

I have two questions about -fast option.

1- Although , in my code, returns around %20 performance increase -fast option makes compile time really long. Usually around 20 minutes.

I can live with that but is it normal? Is there any tricks at the coding level to decrease compile time?

2- In my project I am trying to use DISLIN package which requires X11 and OpenGL libraries. I have successfully linked using

-L/usr/lib64/ -lX11 -lGL .

With this link I can compile &run my code if I use -O3 optimization level. However if I try to use -fast option compiler returns with

cannot find -lX11. I don't want to sacrifice with -fast option but also want to use DISLIN package.

Regards.