The new IL2CPP scripting backend in Unity 4.6.2 and 5.0 is supposed to be much faster than the old Mono backend. I ran some benchmarks, but mostly found slowdowns compared to Mono. Today’s article shows the tests I ran, the results I got, and wonders why the IL2CPP version seems so slow. Perhaps one of you, dear readers, knows the reason why. Update: Part of the reason why has been discovered. Read on for updated results.