since you wrote the initial data access part yourself way back when, I'd
expect you to fix cppyy if it were slower! :)
that's a fair point, indeed :).
But on top of that you need to put a layer which exposes a pythonic interface (for example, offering list-like classes with an __iter__ and a __getitem__). So I have no idea of how the final speed of the thing will be, until someone tries and measure :).