Is the content of the bootstrap module used after the interpreter is boot strapped? I see ... that's a problem. It's a proof of concept anyway and the speed up is minimal. On my computer with a SSD the speedup barely measurable. I'd like to see if it makes a difference on a Raspbarry Pi or a NFS shares

I have another idea, too. Could we add an optional 'stat' argument to __init__() of FileLoader and ExtensionFileLoader so we can pass the stat object around and reuse it for loading?