oficially offer win64 version of tor
Due to recent botnet activity relay operators suffer from high cpu usage. Properly recompiling tor with mingw64 helps reduce cpu usage twice. I did it for myself and think others will also benefit from that. I also did small modification to sources to allow settings process priority for tor. It can be important to lower priority when running on single and two core cpus if you use your computer for other purposes than tor and dont want tor to slow down anything else.