Sure. Now do this in Java (I have no idea why I'm getting downvoted for this thread because I think this stuff is fairly straightforward and nobody's actually making an argument to the contrary, but whatever):

  short[] x = new short[1000000];
  short[] y = new short[1000000];

4MB of shorts. Now you can use the argument of locality of reference, to be sure--but you're already throwing out the window by keeping around a million items.

This is why I'm saying that in the what I would call most perf-critical cases, value type structs are a convenience much more than a tool to realize significant benefits. They are nice-to-haves. They don't make your code magicfast.