Understood, and I agree that constant-time assembly-coded crypto is much more important. Moreover, if you make `posix_spawn()` fast that's enough, and you can

Understood, and I agree that constant-time assembly-coded crypto is much more important. Moreover, if you make `posix_spawn()` fast that's enough, and you can probably do that by proxying it from the victim program's C library to Fil-C's.