Google's Chrome Native Client technology
http://code.google.com/chrome/nativeclient/ could be used to built a really
fast version of the LFC.
"Native Client allows your web app to run native code modules that render 2D
and 3D graphics, play audio, respond to mouse and keyboard events, run on
multiple threads, and access memory directly—all without requiring users to
install a plugin. Because Native Client runs within its own sandboxed
execution space and validates executable modules against a special set of
rules designed to protect the resources on the user's system, it offers the
safety of traditional web apps in addition to its native performance
benefits."
