Colibri's pioneering tools were built a long time ago, using compilers targeting old hardware.
To make it go more quickly, you can invest lots of money in new hardware (which will be used inefficiently), or invest lots of time writing new software, so as to exploit modern hardware/compilers.
Don't bother using the V2 tool to create new chains for V1 (or V2): Colibri regulated the project by way of his chainauthor.map, which is no loger updated & appears to be protected/signed.