How do I share a hash table among multiple processes to store temporary http sessions?

Sure, serialization/deserialization takes some time, but disk write/read is VER SLOW. Redis is an in memory no sql key/value database, I think it really fits your needs very well.

Performance comparison of various compilers

I didn't look at the code, but the run.bat is not optimized for release. nim c -r RayTracer.nim Run I created this PR in the repository.