Asyncread crashing Live

I'm trying out loading video files inside the poly~ object as Andrew Benson does in his vps patches.

It works when I use read to load the files but if I change it to asyncread it crashes Live.

Here's the contents of the poly~ . It loads all the files on startup.

Anyone tried anything similar? I don't really understand asyncread anyway - does it happen in the background? Is loading loads of files asynchronously at (roughly) the same time a bad idea in any case?

Thanks