[jandem]

> Is that the difference, or am I missing something else?

That's part of it. The generated interpreter should be a bit faster for simple instructions because of the reason you give (also: things like debugger breakpoints have more overhead in the C++ Interpreter).

However, the bigger speedups are because the generated interpreter can use Inline Caches like the Baseline JIT. The C++ Interpreter does not have ICs.

[tom_mellior]

Ah, yes, inline caching probably explains it. Thanks!