You might be amused to go to the bytecpu web site that has bytemark bytecpu program compiled for all kinds of operating systems using gcc for these systems. If you get the Windows 98 version of bytecpu, then go to the Byte magazine web site and get their bytecpu, compiled using a non-gcc compiler, you will discover that the gcc version of bytecpu runs about 7% faster. So, compiling lynx with gcc ought to mean the resulting lynx executable is 7% faster than compiled with brand X.
