[jjuran]

I knew of Executor, but never saw it in action. Winning back performance lost to emulation was critical when competing with contemporary real hardware, and kudos to ctm and ARDI for their clever solution.

Decades later, though, emulation performance is mostly a non-issue (and even improves automatically with faster hosts). What matters now is portability (which requires ongoing maintenance) and renovation of programs designed around having the CPU to themselves (via dynamically applied patches).