Fs2 open on Linux/Optimization

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« Pre-Compile Configuration The fs2_open on Linux Guide
Compiling »

Warning: If you compile a debug build, don't use the -fomit-frame-pointer and -fno-ident compiler flags, as it will make debugging impossible.

Note: This step is only for those who want the bleeding-edge source code to compile on their own. You can skip this if you intend to use a provided binary executable.

Optimizing fs2_open might have little or no effect, or improve performance greatly, I honestly have no clue.
You can specify your compiler flags with the configure script, see below.

$ ./configure CFLAGS="<your desired flags>"

If you want to play it safe, a good set of CFLAGS would be

$ ./configure CFLAGS="-march=native -O3 -pipe -fomit-frame-pointer -fno-ident" CXXFLAGS="$CFLAGS"

In particular, the following flag has been reported to increase the FPS when not looking at nebula: (thanks to oldlaptop for this advice)

$ -fpredictive-commoning

You should read up on CFLAGS and what they do before trying anything. I recommend you read through these links (adjust the URL as required for your version of GCC).