Bastion - Horrible Frame rate

I think the title pretty much says it all.  The last time I played a game that had such horrible frame rate,  it was Witcher 2 and that game had much more splendid than Bastion.  I don't know why it's slow as hell, but it's really killing the experience.  I also tried dropping the resolution, going window mode, disabling vsync and using nofixedstep.  None of it really helps me.  This is incredibly annoying for a game that hasn't really convinced me it's worth it to power through it in its entirety.